Статті в журналах з теми "Hydraulic structures Developing countries Design and construction"

Hydraulic structures such as surface drainages and culverts are usually constructed in urban areas with the intention of draining runoff into nearby streams and rivers in order to avoid flooding. However, most of these structures frequently fail to serve the intended use due to the occurrence of high intensity rainfall accompanied with long duration, which produce runoff discharge higher than their designed capacities. This is common in many developing countries as drainages and culverts are most times constructed without considering hydrological analysis of the catchment. Hence, this research considered Port Harcourt city as a case study by utilizing 50 years rainfall data to develop rainfall Intensity-Duration-Frequency (IDF) curves that will be used for subsequent design of drainages and culverts within the city and its environs. The IDF curves were developed using Gumbel, Pearson type III and Log-Pearson type III distributions at return periods of 2, 5, 10, 25 and 50 years. However, the durations considered were 5, 10, 20, 30, 45, 60, 90, 120, 150, 180, 210, 240, 300, 360 and 420 minutes. Results showed that the IDF equations developed for the three frequency distributions highly correlate with the observed intensities since there goodness of fit (R2 ) ranges from 0.9766 – 0.9865. Also, it was noted that there was no significant difference (p < 0.01) between the predicted rainfall intensities from all the IDF equations and the observed intensities. Notwithstanding, the IDF equation developed for Gumbel distribution was recommended to be given higher priority since it has the highest R2 value.

Earthquakes are among of the most harmful and potentially fatal natural disasters. Masonry structures in seismic zones of urban and rural areas around the world pose a threat to human life. Housing that is both affordable and earthquake-resistant in earthquake-prone areas is currently in demand in developing countries. For affordable earthquake-resistant structures in earthquake-prone areas, numerous researchers have studied mortar-free interlocking structures. Plastic blocks are used in order to reduce the mass of the overall structure. To start with, structures under gravity are explored first because more than 95% of its design life, any structure has to withstand gravity. Prototypes of interlocking plastic-block columns, solid walls, and walls with an opening are considered for making the mortar-free structures. In this study, the effect of slenderness on the behavior of interlocking-plastic-block structural elements is investigated under compressive loading by a servo-hydraulic testing machine in the laboratory. The effect of slenderness on the behavior of one and two-block-wide structural elements was investigated in terms of the stress–strain curve, energy absorption, and toughness index under compressive loadings. Correlations between the compressive strength of interlocking-plastic-block structural elements with varying thicknesses were found. Scaled-down prototypes of interlocking-plastic-block structural elements having two-block wide depicted more resistance to compressive loads than one block wide structural elements. The correlations among the one and two block wide interlocking-plastic-block columns, single and double-block-wide solid walls, and single and double-block-width walls with an opening found in this analysis were Pdc = 2.2 Psc, Pdsw = 2.9 Pssw, and Pdwo = 3.5 Pswo. This study can be applied in the future to better understand the detailed behavior of interlocking plastic blocks.

The design parameters and characteristics of dams were estimated during the design of dams in the 40–60th of the last century, and require updating, as well as changing the existing methodological approach to their determination. In the article the data of the current state, regulatory, technical and literary sources used at designing, construction and operation of hydraulic structures (HS) are collected, the comparative analysis of normative and technical documentation of the Republic of Kazakhstan, European countries, the USA, China, etc. used at designing and operation of dams is carried out. Examples of world practices in the application of legislation and regulating in terms of dam safety have been considered. A number of normative documents of the Republic of Kazakhstan on the main directions of activity of hydraulic structures, applied at all stages of their existence, from design and construction to operation and liquidation, are determined. The state regulations in the field of architecture, town planning and construction are reviewed, the main purpose of which is to ensure the legally protected needs of citizens and society in creating a favorable and environmentally safe living environment and life, in implementation of architectural, town planning and construction activities, protection of consumer rights of design and construction products, ensuring reliability and safety of construction, sustainable operation of the constructed facilities during operation and maintenance of hydraulic structures. Names and brief contents of standards for dam design in a number of developed countries are given.

Introduction. The authors present the findings of the physical modeling of the wave impact on the hydraulic structures of the construction facility known as “An offshore coal terminal at Syradasay coal deposit”. The authors have analyzed the experimental studies to provide recommendations on the most effective structural design of the connecting dam. Materials and methods. The method of physical modeling was employed to conduct the experimental studies Most of construction sciences are based on experimental research and, if the scientific support of structures, including those dealing with hydraulic engineering, is available, physical modeling is the top-priority research method in the international engineering practice. The experiments were conducted in a wave flume, which is a research and experimental facility at the Centre for Hydraulic Engineering Research and Education, NRU MGSU. The most advanced measurement equipment, produced by Wallingford (UK), was employed. The research methodology, used to verify the effectiveness of hydraulic structures, was tested on a large number of design structures that had been examined, built and are being successfully operated. Results. Given the data of experimental studies, the most effective design of a connecting dam was recommended as part of the design of an offshore coal terminal. Conclusions. The findings of this research will ensure the construction of an offshore coal terminal, which is built in difficult natural conditions typical for harsh Arctic latitudes, in the area characterized by intensive coal mining (Syradasay coal deposit), which is most relevant for the task of developing cargo port facilities along the Northern Sea Route.

Many earthquakes in the past had shown that major damage to structures took place in the absence of proper design, construction, and quality control. Based on the extent of damages caused by earlier earthquakes and the building vulnerability parameters that has caused the damages, a statistical analysis was carried out to develop a vulnerability score sheet. In this score sheet, a vulnerability score is computed considering building attributes such as soft storey, substantial overhang, re-entrant corners, the age of buildings, apparent material and construction quality, eccentric staircase location with respect to building plan, maintenance, soil type and a number of storeys. This score sheet will be a very helpful technique for assessing huge building stocks.

Most of the human casualties in past earthquakes were attributed to the collapse of buildings, particularly masonry constructions in developing countries. Most of these buildings are categorized into “Non-Engineered Construction.” In effect, these structure are spontaneously and informally constructed in various countries in a traditional manner without any or with little intervention in their design by qualified architects and engineers. Unfortunately, these types of buildings have been extensively constructed in most of the seismic prone areas in developing countries. Therefore, the safety of “Non-Engineered Construction” has become one of the most urgent issues in recent years. The concrete hollow block (CHB) masonry structures have recently become common residential structures in the Philippines. A full-scale shaking table test on CHBmasonry structures of Philippine ordinary houses was conducted in Japan. This experiment aims to acquiring a better understanding of the behavior of these structures during major earthquakes, and its results will be used to produce simple seismic evaluation methods as awareness tools, and to disseminate information on safer construction of houses in the Philippines.

With massive energy demands, the majority of developing countries are at a critical juncture in their industrial development. Their energy structure, on the other hand, is relatively specific and heavily reliant on fossil fuels, resulting in significant environmental pollution. As a result, the development of clean energy is on the horizon, which is related not only to whether developing countries can build a resource-saving and environmentally friendly society but also to whether they can achieve socially sustainable development. As a significant clean energy source, not only does hydropower play an important role in the development of an energy-efficient and environmentally friendly green economy, but it also has numerous benefits such as shipping, irrigation, flood control, and water supply. So, hydropower development is critical for developing countries to adjust their energy structures, achieve regional development balance, and ensure river defense safety. However, precision guidance technology is maturing around the world. If one side’s water-retaining dam is accurately blasted in the event of a full-scale war or local conflict, it may cause significant economic and human losses. Dam safety and protection from strong explosions deserve special attention given the obvious seriousness of the consequences. It is critical to improve the anti-explosion safety of major hydraulic structures by revealing the dynamic response behavior, damage mechanism, and dam characteristics under explosion impact loads, as well as evaluating the dam’s condition after extreme loads. In the critical work of disaster prevention and mitigation, this is crucial to our social and economic development. This study is not only a key technical problem and an important strategic task in hydraulic structure construction, but it may also serve as a guideline for governments to take effective measures to reduce the loss of dam break under special circumstances.

The article stresses actual importance of protection against coastal erosion almost all over the world, gives short overview of hydraulic structures traditionally used to combat erosion. The problems arising during the operation of such hydraulic structures, the restrictions imposed on them in various countries, are noted, which raises the question of the need to search for new solutions based on modern materials that surpass traditional analogues in strength and durability and create opportunities for new design solutions. One of such solutions is the modular pile breakwater “Comb” in the cover of composite materials, which protects the concrete body of the breakwater from the aggressive marine environment and destructive wave impact. “Comb” provides fast and convenient installation technology, which is several times faster than the speed of construction of traditional breakwaters and allows creating from modules any configuration that is optimal for solving problems of counteracting coastal erosion in a particular area. The design was investigated during several cycles of flume tests in one of the leading Russian specialized laboratories; results were obtained confirming the high efficiency of the Comb structure. This allowed the transition to full-scale field tests of the breakwater

FHWA, AASHTO, and TRB sponsored a scanning review of European practice for bridge scour and stream instability countermeasures in October 1998. The review involved a panel of representatives from six state highway agencies (California, Illinois, Maryland, Minnesota, Oregon, and South Carolina), FHWA, two universities, and the private sector. The review included visits to hydraulic research laboratories, highway research institutes, and field sites in four countries—Switzerland, Germany, the Netherlands, and the United Kingdom. Findings during the scanning review can be classified as general observations and observations of specific countermeasures. General observations of European practice include design philosophy, risk analysis, environmental policy, river geomorphology, scour prediction, modeling, and inspection and monitoring. Observations of specific countermeasures include riprap design and construction, filter design and construction, river-training structures, riverbed degradation countermeasures, bioengineering, and flow-altering devices. These observations are contrasted with U.S. practice. The panel’s recommendations for modifying U.S. practice on the basis of the European experience and findings that deserve further evaluation are also presented.

This paper studies the behaviour of prototype rockfill dams under turbulent flow conditions to identify the flow-through characteristics of rockfill materials and examines conventional design principles. Two scales of prototype rockfill dams were studied. The first type of prototype tests included fifteen 0.5 m tall dams constructed with three different downstream slope angles. The dams were monitored for upstream and downstream water level, discharge rate, particle movement on the downstream face, and any noticeable failure (local or global) during the experiments. The second set of prototype tests included two 1.2 m tall dams constructed to study the internal hydraulic conditions and required a flow environment to initiate particle movements in rockfill structures. The results from the testing of small-dimension dams (mini-dams) provided understanding for developing the methodologies to optimize the design and construction of the scale-dam tests. The hydraulic performances of the scale-dams are presented using vibrating-wire piezometers measurements. Experimental data of the stage–discharge relationship are compared with predictive models, which show strong correlations.

The behaviour of materials used for developing engineering structures should be properly foreseen during the design phase. Regarding geosynthetics, which are construction materials used in a wide range of engineering structures, the installation on site and the action of many degradation agents during service life may promote changes in their properties, endangering the structures in which they are applied. The evaluation of the damage suffered by geosynthetics, like installation damage or abrasion, is often carried out through laboratory tests. This work studied the behaviour of five geosynthetics (three geotextiles and two geogrids) after being individually and successively exposed to two degradation tests: mechanical damage under repeated loading and abrasion. The short-term mechanical and hydraulic behaviours of the geosynthetics were analysed by performing tensile tests and water permeability normal to the plane tests. Reduction factors were determined based on the changes occurred in the tensile strength of the geosynthetics. Findings showed that mechanical damage under repeated loading and abrasion tended to affect the mechanical and hydraulic properties of the geosynthetics and that the reduction factors calculated according to the traditional method may not be able to represent accurately the damage suffered by the materials when exposed successively to the degradation mechanisms.

Purpose – Trade credit (TC) provides access to capital for construction contractors globally and is an important source of finance in both developed and developing countries. The purpose of this paper is to explore key factors underpinning construction suppliers’ decisions to provide TC to Ghanaian construction firms. Design/methodology/approach – Primary data from a structured survey of 75 construction suppliers are analysed. Principal component (factor) analysis explores complex structures among suppliers’ decision-making variables. Findings – Underlying constructs of decision criteria exist among seven key factors: financial profile of the contractor; parties’ profit margins; asset portfolio and project particulars; TC quantum and repayment terms; age and experience of the contractor; contractor corporate image; and parties’ cash flows. Originality/value – This is a new decision criteria framework for suppliers and contractors, who utilise TC.

Breakwaters are used to suppress the energy of waves for providing shelter to coastal and offshore facilities. Very often, the conventional rubble mound breakwaters result in high construction cost and several environmental problems, such as water contamination and wave amplification in front of the structures due to severe wave reflection. One way to alleviate the above-mentioned problem is to appropriately increase the porosity of the breakwaters. This paper aims at developing the optimum design of a porous box-type breakwater comprising multiple scrapped pipelines via physical modelling approach. Herein, the best geometrical design of the breakwater under the governing factors of porosity, width and internal tube length is proposed. A series of experiments have been conducted under the influence of regular wave environment through the analysis of wave transmission, reflection and energy loss. Several geometrical design criteria were derived to maximize the hydraulic performance of the breakwater, when adopted at sites. The proposed breakwater is a reasonably good wave attenuator and anti-reflection structure as well as an effective energy dissipator.

Owing to the elevated cost of bridges, especially when compared to the cost of roads, their rational design and material selection are fundamental properties to consider when aiming to reduce the environmental impacts and lengthen the lifespan of the bridge. Especially in developing countries, the construction of new bridges (mainly short spanned) is still a necessity, and it is important that these new structures are designed according to all the sustainability parameters, instead of being based only on the construction cost. Thus, the present work aims to study short-span bridges by integrating environmental assessments into the decision-making process. To achieve this goal, three short-span bridge designs, proposed by public organizations in Brazil, are evaluated: Precast concrete bridge, mixed concrete/steel bridge, and timber bridge. In order to allow comparison, the same location and span are considered. The structures are evaluated considering the following quantitative aspects: Cost of construction, assembly and material transportation, lifespan, and environmental impact (measured by the global warming potential, GWP). In addition, some more subjective factors are considered, such as the architecture (layout and appearance) and the user’s sensation of security. The selection is made by the adoption of two multi-criteria decision-making methods (analytic hierarchy process or AHP and Vikor). The results obtained with both methods indicate the mixed concrete/steel bridge as the most adequate alternative. Some additional analysis is performed in order to evaluate the influence of the qualitative aspects, as well as to study the importance of the variations in the costs on the results.

Prefabricated construction is one of the most intensively developing areas of research in the field of construction and building technology in the world. The results of the scientometric analysis prefabricated construction are presents in this paper. The purpose of the scientometric analysis was to study the directions and effectiveness of research, to determine the leading countries, organizations, scientific journals, to define the level of prefabricated construction in the Republic of Belarus in the context of economically developed countries. The scientometric analysis was carried out in the analytical system SciVal with the use visualization tools, quantitative and qualitative scientometric metrics. Growth of the number of publications in the field of prefabricated construction and indicators of analyzed scientometrics metrics confirms the fact that prefabricated construction attracts more and more researchers all over the world and is a promising direction of scientific research. Determined that design and informational modeling, organization of construction and precast structures production, delivery of structures to the construction site and their assembly, including reliability, efficiency, environmental friendliness of prefabricated construction are main topics in the field of prefabricated construction. At the same time, topics in the field of research of technologies and organization production of reinforced concrete elements in plant, production management are given less attention, which requires further research in these areas. The results of the scientometric analysis allow us to identify trends, determine priority areas for further research and their connection with other fields of science, and can be a scientific basis for identifying data gaps in current research in the field of prefabricated construction.

Introduction: The article addresses the possibility of using universal energy-efficient engineering and technological solutions in mass housing construction, regardless of the climatic region of construction, with account for modern development in Saint Petersburg (Russian Federation) and Münster (Germany). The article not only considers improvements in building technologies used in modern housing construction but also offers an overview of the latest energy-efficient materials and structures. Purpose of the study: We aimed to introduce energy-efficient solutions in housing construction using innovative technologies and materials. In addition to theoretical materials, practical calculations will be presented, clearly showing the advantages and disadvantages of various engineering and technical solutions. Methods: In the course of the study, we used a) a comparative analysis of physical and thermal properties as well as strength characteristics of building materials used in mass housing construction; b) a problem-logical method to analyze possible typical space-planning and structural solutions for the design and construction of buildings, with account for climatic conditions and geographical features of the construction region, in compliance with the basic principles of modern sustainable construction, energy and environmental standards, economic efficiency of the solutions used, in accordance with international European LEED and BREEAM and Russian GREEN ZOOM standards. Results: We propose to introduce, along with the already well-known and time-tested ones, innovative patented solutions in materials and construction technologies both in private and mass housing construction in the countries under consideration: Russian Federation and Germany. Discussion: The discussion of field tests and implementation of the latest building materials in housing construction clearly demonstrates the importance of international cooperation in this field at various levels. As a consequence of the growing volume of housing construction and energy consumption, there emerge new stricter requirements and standards for the quality of materials produced and their technical characteristics, as well as a variety of decorative solutions enabling the construction market to be competitive and meet the over-demand requirements of the rapidly developing industrial society, while necessarily taking environmental protection measures, including those on conservation and mindful use of natural resources.

The quality of university students’ graphic training should meet modern requirements to design and development execution and design drafting. The role of students’ tools training for wide use of CAD systems in solving of learning problems and execution of project tasks is increasing. It meets modern requirements to designer’s professional activity. The lack of clear and accurate originals for construction of views, sections, schemes and tabular materials, as well as use of hand work and the counterfeit automated software products, are current problems for graphics culture in the field of hydrotechnical design because significantly reduce labor productivity, quality of drawing’s performance and use. The authors offer a novel approach to formation of graphics culture in future engineers in the field of hydrotechnical construction. In this paper the possibilities of the AutoCAD system, mainly as a tool for performance of a wide range of engineering graphics tasks of any complexity when developing drawings for hydraulic engineering constructions have been considered, including: • search and analysis of layout solutions. By using AutoCAD system in its simplest, basic version, one can both analyze configuration of huge structures with accuracy up to 0,001 m and design drawings for more sizeable objects, such as plants, hydroelectric power stations, conglomerations; • design drawings of any subject and complexity. The basic version’s possibilities are quite enough to convert obtained layout solutions into high-quality project documentation that meets the requirements of domestic design standards; • design development for work execution – even without a digitized basis; • construction of loading schemes and stresses epures; • construction of graphs and diagrams. Sequential approach to formation of graphics culture will allow realize a united learning task on engineering and computer graphics for aiding in solution such important task as providing of combination for manual and computer-aided drawing when getting students’ education in graphics courses.

Abstract: This study examines the composite structure that is increasing commonly in developing countries. For medium-rise to high-rise building construction, RCC structures is no longer economical due to heavy dead weight, limited span, low natural frequency and hazardous formwork. The majority of commercial buildings are designed and constructed with reinforced concrete, which largely depends on the existence of the constituent materials as well as the quality of the necessary construction skills, and including the usefulness of design standards. Conventional RCC structure is not preferred nowadays for high rise structure. However, composite construction, is a recent development in the construction industry. Concrete-steel composite structures are now very popular due to some outstanding advantages over conventional concrete and steel structures. In the present work, RCC and steel-concrete composite structure are being considered for a Dynamic analysis of a G+25-storey commercial building of uniform and optimized section, located at in seismic zone IV. Response Spectrum analysis method is used to analyze RCC and composite structure, CSI ETABS v19 software is used and various results are compared such as time period, maximum storey displacement, maximum storey stiffness. Maximum storey shear and maximum stoey overturning moment. Keywords: RCC Structure, Composite Structure, Uniform Section, Optimized Section, Shear Connector, Time Period, Storey Displacement, Storey Shear, Storey Stiffness, Response Spectrum method, ETABS

Whilst sustainable construction relates to both a building’s structure and the use of proper life cycle processes, the selection of the most appropriate material/s is deemed a considerable undertaking. Throughout a building’s lifecycle that extends from design, construction, operation, maintenance, renovation, until demolition, the selection of sustainable material/s is a particularly crucial task for the development and establishment of such structures. Traditionally, there are three main materials for general construction: (1) Steel, (2) Concrete and (3) Timber. These materials not only influence the function within the structure, but also affect the operation cost and energy usage. Operation cost reduction and energy savings are typically elements of the sustainable construction sphere. However, in developing countries, there is a variety of highly critical factors, which can impact material selection as well as the long-term sustainability of the structure, including: Fire Performance, Environmental Impact, Structural Performance (strength and durability), and Functioning Capabilities. Accordingly, this paper will first compare the sustainability of these three key materials and then converse with appropriate processes for material selection. Attention will be given to the sustainable construction recompense associated with the different material selection factors. Doing so ensures a more sustainable built environment by means of an improved material selection process.

Introduction. State policy in the field of housing construction, providing the increase in the volume and decrease in the cost of housing construction, promotes to the development of prefabricated construction. In its turn, the increase in the prefabricated construction requires studying and introducing modern organizational and technological solutions for the erection of buildings and production of precast reinforced concrete structures, determining the directions of improvement of prefabricated construction. Materials and methods. To study the development and effectiveness of prefabricated construction, actual directions and tendencies of scientific research in the field of prefabricated construction, the structure of citation of publications, key researchers, leading countries, institutions, scientific journals a scientometric analysis was carried out based on the SciVal analytical system using visualization tools, quantitative and qualitative scientometric metrics. Results. Analysis of research trends in the field of construction and building technologies in the world has shown that prefabricated construction is one of the most intensively developing and promising areas of research. The main subjects of research in the field of prefabricated construction are design and information modeling, organization of prefabricated construction and production, delivery of structures to the building site and their assembling, at that, less attention is paid to the research in the field of production technologies of precast reinforced concrete structures in the factory conditions and production management, for which further research in these directions is needed. Studies of the development of industrial house-building in the practice of housing construction have shown that the efficiency of prefabricated construction must be considered in the context of a particular country or region and evaluated by applying a systematic analysis of costs and benefits. Conclusions. The results of the executed scientometric analysis make it possible to identify trends, priority areas for further scientific research and their relationship with other areas of science, and can be a scientific basis for identifying gaps in current research in the field of prefabricated construction.

Estimation of the design flood flow for hydraulic structures is often performed by adjusting probabilistic models to daily mean flow series. In most cases, this may cause under design of the structure capacity with possible risks of failure because instantaneous peak flows may be considerably larger than the daily averages. As there is often a lack of instantaneous flow data at a given site of interest, the peak flow has to be estimated. This paper develops new machine-learning-based methods to estimate the instantaneous peak flow from mean daily flow data where long daily data series exist but the instantaneous peak data series are short. However, the presented methods cannot be used where only daily flow data are available. Developed methodologies have been successfully applied to series of flow information from different gauging stations in Iran, with important improvements compared to traditional empirical methods available in the literature. Reliable results produced by the machine-learning-based models compared to the traditional methods show the superior ability of these techniques to solve the problem of inadequate measured peak flow data periods, especially in developing countries where it is difficult to find sufficiently long instantaneous peak flow data series.

Design of modern thin-walled metal structures is widely used around the world. In recent decades, more comprehensive research is carried out to investigate the behaviour of various thin-walled structures. Generally, the structure with regular geometry is investigated. In various countries such as USA, Russia, and the European Union issued the standards on regulation of the construction, design and maintenance of thin-walled structures. The actually used period of tanks usually is longer than recommendatory period. Recommendatory maintenance period of metal tanks is 15–20 years. Therefore, for such structures one of the most considerable questions is the residual load bearing capacity beyond the end of the maintenance period. This phase of using of structures is associated with complex investigation and numerical analysis of thin-walled structures. In this paper the load bearing capacity of the steel wall of the existing over-ground vertical cylindrical tank in volume of 5,000 m3 with a single defect and with a few contiguous local defects of the shape is analyzed. Calculations carried out are taking into account all the imperfections of the wall geometry. A major goal of the research – developing a realistic numerical model of the object analyzed, taking into account all the imperfections, determining the wall stress and strain state, exploring the places of extreme points, calculating the residual load bearing capacity of the tank and scrutinizing possible strengthening schemes for defective areas.

The construction of radiation shielding buildings still developed. Application of ionizing radiations became necessary for different reasons, like electricity generation, industry, medical (therapy treatment), agriculture, and scientific research. Different countries all over the world moving toward energy saving, besides growing the demand for using radiation in several aspects. Nuclear power plants, healthcare buildings, industrial buildings, and aerospace are the main neutrons and gamma shielding buildings. Special design and building materials are required to enhance safety and reduce the risk of radiation emission. Radiation shielding, strength, fire resistance, and durability are the most important properties, cost-effective and environmentally friendly are coming next. Heavy-weight concrete (HWC) is used widely in neutron shielding materials due to its cost-effectiveness and worthy physical and mechanical properties. This paper aims to give an overview of nuclear buildings, their application, and behaviour under different radiations. Also to review the heavy-weight concrete and heavy aggregate and their important role in developing the neutrons shielding materials. Conclusions showed there are still some gaps in improving the heavy-weight concrete (HWC) properties.

Concrete made with Portland cement is by far the most heavily used construction material in the world today. Its success stems from the fact that it is relatively inexpensive yet highly versatile and functional and is made from widely available raw materials. However, in many environments, concrete structures gradually deteriorate over time. Premature deterioration of concrete is a major problem worldwide. Moreover, cement production is energy-intensive and releases a lot of CO2; this is compounded by its ever-increasing demand, particularly in developing countries. As such, there is an urgent need to develop more durable concretes to reduce their environmental impact and improve sustainability. To avoid such environmental problems, researchers are always searching for lightweight structural materials that show high performance during both processing and application. Among the various candidates, Magnesia (MgO) seems to be the most promising material to attain this target. This paper presents a comprehensive review of the characteristics and developments of MgO-based composites and their applications in cementitious materials and energy-efficient buildings. This paper starts with the characterization of MgO in terms of environmental production processes, calcination temperatures, reactivity, and micro-physical properties. Relationships between different MgO composites and energy-efficient building designs were established. Then, the influence of MgO incorporation on the properties of cementitious materials and indoor environmental quality was summarized. Finally, the future research directions on this were discussed.

Geomembranes are used worldwide as basin liners in tailings ponds to decrease the permeability of the foundation and prevent further transportation of harmful contaminants and contaminated water. However, leakage into the environment and damage to the geomembrane have been reported. This paper reviews available literature and recommendations on geomembrane structures for use as a basal liner in tailings ponds, and presents a framework to achieve early involvement and an integrated approach to geomembrane structure design. Cohesive planning guidelines or legislative directions for such structures are currently lacking in many countries, which often means that the structure guidelines for groundwater protection or landfill are applied when designing tailings storage facilities (TSF). Basin structure is generally unique to each mine but, based on the literature, in the majority of cases the structure has a single-composite liner. The type of liner system used depends mainly on the material to be used on top of the structure, local hydraulic pressure gradient, and climate conditions. More practical information and scientific knowledge on the use of base liners in various cases are needed. A sustainable approach could be risk-based design, where the life cycle of the basin is taken into consideration. To this end, this paper proposes geomembrane-lined tailings pond to be assessed as a stakeholder. Emphasis on this, early enough, can ensure critical factors for tailings ponds to be considered from the outset in the design of mines and reduces the environmental footprint of the mining industry. More holistic project management and early involvement and integration are recommended to improve construction quality during the entire life cycle of the pond. In the long term, use of dry stacking or other alternative methods should be encouraged, despite the higher costs for operators.

All over the world, climates are changing due to various reasons, and there is an increase in natural disasters. Increasing disasters bring economic, social and environmental losses along with loss of life. It is important to study the disaster architecture and develop recommendations due to climate change in countries such as Turkey, where the construction sector is constantly dynamic and developing. The aim of study is to evaluate traditional and modern housing properties in terms of climate resistance and to make housing design proposals to prevent the damage caused by disasters to structures. The scope of the study consists of the Talas district, Kayseri, which has become the center of Central Anatolia. The high rate of housing production, the frequent occurrence of natural disasters in recent years, and the greater damage to newly designed houses from disasters have been effective in determining the study sample area. The study was conducted to investigate the effects of disaster resilience, stability, concept and building elements in architecture.

Rammed earth (RE) constructions are widespread in underdeveloped rural areas in developing countries. However, these RE constructions are often susceptible to earthquake damage due to their poor seismic performance. Precast concrete tie columns and ring beam (tie bars) were proposed to improve the seismic behavior of RE constructions. Four RE walls, including a traditional RE wall and three RE walls with precast concrete tie columns and ring beam (tie bars), were tested under reversed cyclic loading, and the seismic behavior of these tested specimens was evaluated in terms of failure pattern, energy dissipation, displacement ductility, and stiffness degradation. The results showed that a significant increase of the load-bearing and deformation capacity could be achieved with the application of precast concrete tie columns in combination with RE. The load-bearing capacity and deformation capacity of traditional RE wall were increased by an average of 113% and 417%, respectively. These test results could provide reference to the design and construction of the environmental-friendly structures in rural areas.

We aimed to evaluate the performance and cost savings of an innovative design of a trickling filter (TF) for small population sizes, developed at the Federal University of Minas Gerais, Brazil referred to as an open trickling filter (OTF). The OTF had no side walls and no perforated bottom slab, and was applied for the post-treatment of sanitary sewage from an upflow anaerobic sludge blanket (UASB) reactor. The OTF had crushed-stone packing (3.5 m high) and was operated with an average surface hydraulic loading rate of 4.1 m3 m−2 d−1 and an average volumetric organic loading rate of 0.10 kg BOD m−3 d−1 (biochemical oxygen demand). The average concentrations obtained at the OTF effluent were 48 mg TSS L−1 (total suspended solids), 132 mg COD L−1 (chemical oxygen demand), 51 mg BOD L−1, 19 mg TKN L−1 (total Kjeldahl nitrogen), 16 mg NH4+-N L−1 and 10 mg NO3−-N L−1, complying with local discharge standards. Analysis of the construction costs indicated savings of 74% compared to conventional TF. Based on the performance, compactness, simplicity and reduced capital costs, it is believed that the proposed OTF is a good alternative for small communities, especially in developing countries.

Reinforced concrete is the most widely used building material in history. However, alternative natural and synthetic materials are being investigated for reinforcing concrete structures, given the limited availability of steel in developing countries, the rising costs of steel as the main reinforcement material, the amount of energy required by the production of steel, and the sensitivity of steel to corrosion. This paper reports on a unique use of bamboo as a sustainable alternative to synthetic fibers for production of bamboo fiber-reinforced polymer composite as reinforcement for structural-concrete beams. The aim of this study is to evaluate the feasibility of using this novel bamboo composite reinforcement system for reinforced structural-concrete beams. The bond strength with concrete matrix, as well as durability properties, including the water absorption and alkali resistance of the bamboo composite reinforcement, are also investigated in this study. The results of this study indicate that bamboo composite reinforced concrete beams show comparable ultimate loads with regards to fiber reinforced polymer (FRP) reinforced concrete beams according to the ACI standard. Furthermore, the results demonstrate the potential of the newly developed bamboo composite material for use as a new type of element for non-deflection-critical applications of reinforced structural-concrete members. The design guidelines that are stated in ACI 440.1R-15 for fiber reinforced polymer (FRP) reinforcement bars are also compared with the experimental results that were obtained in this study. The American Concrete Institute (ACI) design guidelines are suitable for non-deflection-critical design and construction of bamboo-composite reinforced-concrete members. This study demonstrates that there is significant potential for practical implementation of the bamboo-composite reinforcement described in this paper. The results of this study can be utilized for construction of low-cost and low-rise housing units where the need for ductility is low and where secondary-element failure provides adequate warning of collapse.

The green building or green architecture has come to light as a strong architectural movement at the end of 1990's and as a main trend in architectural practice. The architectural green is a modern architectural philosophy which deals with the competent relationship between the functional constructive systems and its vital environmental, by controlling the inputs and outputs of this system with the least negative effects on the environment and occupant's health, and the least energy consumption during the various stages of the building ( construction, operation, maintenance and destruction ) to achieve the functional activities and the inventive and efficient architectural structures. The importance of this movement lies in trying to achieve the sustainable development in its environmental, social and economic aspects because of the problems that developed and developing countries ( e.g. Iraq ) face such as energy consumption and pollution. Several international standards of different classifications, depending on local context of each country, has been appeared. Some of these tools are (BREEAM, LEED, CO-CHPS Colorado, GBTool, CASBEE) which aim to assess the performance of the building from green Architecture's perspective. Although there is a similarity in the classification levels including the sustainable location, how to use (water, energy and atmosphere, materials, resources) effectively, indoor environment quality and the design's innovation, they differ in other aspects that its importance relies on the environmental and local context. The problem of our research was the absence of the practical evaluation tool of the green building ( school buildings ) for the Iraq's local context in general and Mosul in particular, compatibly with the city climate. The research aims at making theoretical construction to identify the assessment indicators of the school buildings from green architecture's perspective, in order to create suitable and general assessment tool for schools building in Mosul city which can help improving the performance of these schools, decreasing the effect on the health, sparing energy coasts, and other benefits in the stages of the project ( pre-construction, construction, post-construction ). The research supposes that the multi-dimensional designing strategy is an active tool used in establishing the tool classification of assessment. For reaching goals, the research adopts the theoretical method and questionnaire. Finally, the research provides an assessment tool for school building in Mosul from the green architecture's perspective (AGBS) Green Building Assessment Tool for school ) in conformity with the local context of the city for enabling the designer to follow it in order to achieve the investment within his school architectural products. Results indicate six categories for assessment tool. First Sustainable Sites category (SS) which have the greatest weight 25.7%, , then Indoor Environment Quality(IEQ) 24.35667%. then Materials & Resources (M&R), Energy & Atomosphere (A&E), Water Efficiency(WE),and Innovotion in design (ID), have 17.32% ، 10.5% ، 3.987181% , Respectively.

Point and nonpoint wastewater sources have a detrimental, negative effect on agriculture, soil, surface, and groundwater supplies. In this research, a wastewater treatment system made up of a sedimentation tank, a horizontal subsurface flow constructed wetland (HSSF-CW), a vertical subsurface flow constructed wetland (VF-CW), and a storage tank was proposed, designed, and cost estimated. Small populations in underdeveloped nations with dry and semi-arid climates can use the treatment system as an affordable construction, maintenance, and operational solution for wastewater treatment. The system will protect agricultural lands and groundwater from pollution. The system can service 6000 capita and has a wastewater discharge of 780 m3/d in the developing arid region in El-Moghra Oasis western desert of Egypt, where the 1.5 million acres used for the land reclamation project based on groundwater irrigation. The relaxed tanks in a series model based on the areal loading rates and background pollutants concentrations (P-K-C*) was utilized to size the HSSF and VF-CWs. The results indicated that the HSSF-CW design treatment surface area was 2375 m2, and the hydraulic surface loading (q) and hydraulic retention time (RT) were 0.33 m/d and 0.55 d, respectively, and utilizing Phragmites australis and Papyrus for the biological treatment. The expected overall cumulative removal efficiencies were 96.7, 70, and 100% for the biological oxygen demand (BOD), total phosphors (TP), and fecal coliforms (FC), respectively. The VF-CW indicates that there was a 2193 m2 design treatment surface area, q = 0.36 m/d, and RT of 0.63 d. The expected BOD, TP, and FC removal efficiencies were 75, 33.3, and 92.7%, respectively. In order to simplify the design stages and the cost estimation, design and investment cost curves were established for a population range from 500 to 9000. The total monthly water loss due to evapotranspiration for the HSSF and VF-CWs indicates a range from 3.7 to 8.5%, respectively. The total investment cost analysis for the proposed system corresponding to 780 m3/d wastewater discharge of indicates a total investment cost of EUR 146,804 and EUR 24.46/per-capita equivalent (P.E). This approach can be used by decision makers in the Mediterranean region and Middle Eastern countries to improve the water quality using social and economic criteria, leading to the effective implementation of ecological restoration projects as a low-cost treatment system and adding a nonconventional water source that can be used in irrigation.

A study was performed to evaluate the current permafrost and groundwater conditions in the reclaimed floodplain of the Lena, one of the largest rivers in the permafrost zone. Data from ongoing hydrogeological monitoring were compared with earlier observations conducted during the reclamation process. The results demonstrate that the placement of dredged fill led to the development of suprapermafrost thaw zones (taliks). The anthropogenic taliks vary in thickness from 10 to 15 m in areas of buried bars to 20 m or more in the former locations of oxbow lakes. There is similarity in seasonal groundwater fluctuation patterns and response to river stage variations across the study area suggesting that a continuous aquifer connected to surface water. The connection with the river is most evident during the spring flood period. Two mechanisms of ground saturation are identified during this time. One is lateral seepage flow from the Lena River into the fill mass. The zone of its influence is limited to 150–170 m from the stream. The second is hydraulic pressure transmission from the river through the subchannel flow connected with the anthropogenic suprapermafrost aquifer. Its influence extends across the entire fill area. Continuous water movement at the base of the fill prevents permafrost aggradation from below. The study results should be taken into account when developing and implementing design and construction standards for engineering structures in the reclaimed floodplains of the permafrost zone.

With the rapid urbanization and updating of traditional production both in China and around the world, more and more abandoned industrial buildings appear. This study focuses on site planning strategies for repurposed industrial buildings into hotels, via numerous repurposed cases in China are analyzed, the master plan design approach is summarized. Based on analysis of cases and theory progressing research. There are several main aspects of master plans for such projects. Firstly, distinguish primary and secondary entrances and exits with design. Secondly, making rational planning for roads, passages, parking areas, leisure areas, and business zones. Thirdly, hold to the principles of building a barrier-free environment, compliance with sustainable development and a friendly environment. Fourth, maximum preservation of the natural and cultural environment, designing outdoor entertainment facilities with old structures. Fifth, highlighting fire safety issues, focus on laws and building codes for industrial buildings or industrial parks repurposed into hotels. Sixth, hold to the "industrial spirit" of hotels, which is especially attractive to visitors. It has a positive effect on urban contexts. Besides, it is important to use elements of regional architecture, traditional construction methods. This research can be useful for stakeholders involved, especially architects and designers. Further research is needed to study more completed related projects, particularly in regional designing of master plans in different developing countries.

This paper presents research work in which an innovative didactic proposal was designed for the study of 3D metric geometry in the second year of A-level courses (secondary education) in the specialty of the sciences. The designed didactic proposal has the format of a workshop of geometry practices and is framed in the Didactic Situations Theory and in the Anthropological Theory of the Didactic. Although the mentioned theories, which the French school has developed since the seventies, are widely known and studied by secondary school mathematics teachers during their training in pedagogy, especially in Spanish- and French-speaking countries, their innovative approach has not been fully implemented in the field of algebraic geometry. Mathematics textbooks follow the traditional approach in which the teacher simply provides the contents and instructs the student, who captures these concepts and reproduces them as they have been supplied. In the presented didactic proposal, the approach proposed by Brousseau is followed, in which three fundamental elements take part: student, teacher, and the didactic environment. The teacher is the one who facilitates the environment in which the student builds his knowledge. In the proposal the didactic contract is stablished, the didactic situations are designed, and the means and didactic variables for the study of 3D metric geometry are chosen. The methodology followed in this study consisted of identifying educational problems; describing the theoretical framework; developing the didactic proposal; and analysis, reflection, and criticism of this training product. The contextualization of the geometry workshop in the field of the construction of structures and the use of deductive reasoning techniques that are applied in synthetic geometry and also in the building information modeling (BIM) methodology may be a way of showing the use of analytical geometry in the industries of engineering and architecture; they also serve as an opportunity for students to better understand this mathematical work.

Intensity–duration–frequency (IDF) curves are widely used in the hydrological design of hydraulic structures. This paper presents a wide review of methodologies for constructing IDF curves with a specific focus on the choice of the dataset type, highlighting the main characteristics, possible uncertainties, and benefits that can be derived from their application. A number of studies based on updating IDFs in relation to climate change are analyzed. The research was based on a comprehensive analysis of more than 100 scientific papers and reports, of which 80 were found to be suitable for the aim of this study. To classify the articles, the key was mainly intensity–duration–frequency curves in relation to the types of datasets most used for their construction, specific attention was paid to the case study area. The paper aims to answer the following research questions. (i) What is the contribution of a data-rich era? (ii) Are remotely sensed data reliable to build IDFs in ungauged or partially gauged watersheds? (ii) How is uncertainty dealt with when developing IDFs? Remotely sensed data appear to be an alternative to rain-gauge data in scarcely gauged or ungauged areas; however, rain-gauge data are still a preferred dataset in the development of IDFs. The main aim of the present work is to provide an overview of the state of the art on the use of different types of data to build IDFs. The paper is intended to support the inclusion of different data types in hydrological applications.

The rapid processes of global motorization, which Ukraine has not avoided, have a growing impact on various aspects of modern society, on the formation of a new urban environment and transport system. At the same time, to create favorable conditions for Ukraine's integration into the EU needs to address infrastructural issues: the systematic organization of facilities for storing cars in general in cities with the provision of their architecture- accessibility, versatility, economy, energy efficiency and more. First of all, this applies to the largest cities, where about 45% of the total urban population of the state live. An acute urban and transport problem is the problem associated with the allocation of areas for transport facilities: parking lots (garages), gas stations, service stations and other car service facilities. In the absence of free space, the cost of urban land increases. Based on this, there is an urgent need to develop modern methods and techniques that allow more efficient use of land resources. One of the possible methods of solving the problem of organizing parking lots is to build them into the lower floors of public buildings for various purposes. The generalization of foreign and domestic design and construction practices made it possible to determine that one of the first examples of built-in parking lots (garages) are two 60-storey residential and office centers in Chicago (USA) on the shores of Lake Michigan, called Marina City (1964). The construction of these centers gave impetus to the architectural and planning organization of buildings and structures for the rational solution of parking in the lower above-ground floors of residential buildings and public buildings and structures. The article summarizes foreign and domestic practice of designing and building such parking lots. It is determined that with a high density of buildings in Ukrainian cities, the method of embedding in the lower floors of public buildings and structures is developing. This reception will be in demand especially in the transition of vehicles to electric vehicles. At the same time, the analysis of domestic regulations on the placement of parking lots revealed the absence of provisions on the possibility of embedding them in the lower above-ground floors of public buildings and structures. However, in the CIS (Commonwealth of Independent States) countries and in the developed countries of the world, such provisions exist, which helps to increase the level of comfort of public services and allows rational and intensive use of the city. Based on the results of research and suggestions, it should be noted that the practice of design and construc- tion reveals the possibility of applying the existing requirements of current state building codes of Ukraine for underground garages, which should be extended and for car parks (garages) located on the lower above-ground floors of other buildings, in particular public buildings. This requires changes and additions to the current urban planning, typological and fire regulations, which are planned to be developed on the basis of this study.

The aim of this work is to study modern methods of production of corrosion-resistant and fire-resistant stress-free reinforcing bars in the world. Non-stressed reinforcing bars are used as working, structural and assembly reinforcement in conventional building structures, as well as in various types of prestressed structures: from openwork prefabricated to huge monolithic hydraulic structures, therefore, its assortment produced by the domestic metallurgical industry in the range from 5,5 to 40 mm in the nominal diameter of a smooth profile and from 6,0 to 40 mm for a periodic profile. Recently, in the world, much attention is paid to the design and construction of buildings and structures with an improved complex of consumer properties, intended, in particular, for work in corrosive and fire hazardous environments. Such developments are not currently being conducted in Ukraine. In the world and in Europe, to increase corrosion resistance and fire resistance, as well as for the manufacture of seismically resistant reinforcing bars (δmax≥7,5 %), hot-rolled low-alloyed (additionally alloyed with V and Mo) and microalloyed steel grades without the use of heat treatment or cold-deformed (cоld stretched) from hot rolled strip of periodic profile. In GOST 34028-2016 for the countries of the Customs Union, it is clearly stated that for the reinforcement of prefabricated reinforced concrete structures and monolithic reinforced concrete, unstressed reinforcing bars in bars or coils with a nominal diameter of 4,0 to 40 mm are also used for the production of such rolled products, low-carbon and low-alloy steel grades are used, which microalloy V, Nb, Mo or add nitride-forming elements Al, Ti, V, Nb. In this case, either hot rolling or cold deformation or heat treatment in the flow of the rolling mill is used. An alternative way of producing corrosion-resistant and fire-resistant stress-free reinforcing bars in the world is the use of stainless steel as a material. Such profiled reinforcing bars are produced in the range of 3,0 to 50 mm by hot rolling or cold deformation. The use of modern technologies for the production of stainless steel reinforcing bars, starting with the addition of effective and high-quality alloying elements and additives in the production of liquid steel and effective methods of metal pressure treatment, which allows us to guarantee the material saving from corrosion and high temperatures in case of fire. A significant disadvantage of this rolled product is its rather high cost.

Delays are a common problem in the global construction industry, affecting the development of the road construction industry, particularly in developing countries. Where, the construction industry faces a lot of risk factors that can contribute to project delays, particularly during COVID-19. The road projects risk management framework was used to identify potential risk categories that could impede the success of road construction in Egypt. On the other hand, road construction in Egypt faces numerous challenges with increasing unexpected parameters throughout the project life cycle. In other words, unanticipated risk factors have a significant impact on the success of project execution. As a result, the study’s primary goals are to investigate the majority of the risk factors that cause road construction delays in Egypt. The impact of numerous risk factors has changed the delays in road projects as the COVID-19 pandemic spread across the world. As a result, the study incorporates previously unstudied factors. As well, the research has sought to investigate the new severity of risk factors during coronavirus infection. Moreover, risk breakdown structures have classified the risk factors into several categories. They include consultant risk, design risk, equipment risk, material risk, owner risk, contract risk, contractor risk, labor risk, external risk [coronavirus effects and others] and operational risk. The strategy employed in the paper is to incorporate the DEMATEL technique and risk analysis into the statistical model. Whereas the risk analysis prioritizes risk based on the evaluation of each specific project risk. Additionally, this approach has been able to create connections between risks, which may make it easier to understand the likelihood and severity of project risk than if the risks were just considered isolated events. Furthermore, the pilot survey is divided into two stages, the first of which is based on risk analysis to identify the most significant risks. As a result, the identification of the high-risk for each category has been researched. The second survey was issued to risk management by evaluating the importance of risk factors and creating causal relationships among components using the decision-making trial and evaluation laboratory (DEMATEL) approach. Finally, it is noticed that operational risk and external risk caused by the effects of the coronavirus have the greatest impact on the delay of road projects.

Purpose The purpose of this paper is to use an index decomposition analysis to investigate the driving forces of China’s CO2 emissions related to fixed asset investments from 2003 to 2015. Design/methodology/approach This paper uses an index decomposition analysis to investigate the driving forces of China’s CO2 emissions related to fixed asset investments from 2003 to 2015. To make policy recommendations, this paper identifies three effects. An approach to calculating energy-relevant CO2 emissions is also presented. Findings The results suggest that the amount of CO2 emissions related to fixed asset investments increased during the entire period. The social and economic effect played a major role in promoting carbon emissions, followed by the fixed asset effect. Therefore, the activity factor was the dominant positive factor, followed by the construction factor. The negative element was the energy effect, in which the energy intensity factor played an important role in reducing emissions, followed by the structural factor. Moreover, the carbon intensity factor might be a potential inhibitory force in reducing carbon emissions. Research/limitations/implications A steady financial policy, relaxed family planning, sustainable urbanization, strategy of innovation-driven development, reform of scientific and technological structures, development of science and technology and exploration of new energy sources are proposed to mitigate carbon emissions from fixed asset investments. The conclusion also provides a reference for developing countries in similar situations. Originality/value This paper uses an index decomposition analysis to investigate the driving forces of China’s CO2 emissions related to fixed asset investments from 2003 to 2015. To make policy recommendations, this paper identifies three effects. An approach to calculating energy-relevant CO2 emissions is also presented.

Purpose The Government of India is proposing the setting up of several new smart cities in the sub-continent. Being an over-populated country, space is at a premium. In congested areas high-rise buildings afford a solution. The purpose of this paper is to present new research involving architecture and computational fluid dynamics (CFDs) must be done at the screening stage of design plans before new cities are laid out. This is achieved in the present study involving a university residential campus with a population of 29,000 comprising of an assortment of high-rise buildings in complex terrain. Design/methodology/approach This paper uses a combination of instrument-fitted drone measurements – (equipped with a barometer, and sensors for obtaining temperature, relative humidity and altitude) along with a computational fluid dynamical analysis to yield deep insights into the ventilation patterns around an assortment of building forms. Findings This study was conducted in a residential complex in the campus of the Vellore Institute of Technology (VIT) India. Based on the deciphered wind velocity pattern, a human thermal comfort study was also conducted. It was concluded that the orientation of the buildings play a pivotal role in enhancing the ventilation rates inside a building. It was observed that a dominant eddy spanning a radius of approximate 34 meters was responsible for much of the air changes within the rooms – the smaller eddies had an insignificant role. This method of ascertaining eddy structures within a study area comprising of an assortment of buildings is essential for accurate prescriptions of glazing ratios on building facades. Research limitations/implications The main research implications pertain to the use of smart ventilation methods in built up environments. The study shows how large eddies drive the momentum transfer and the air changes per hour with rooms in high-rise buildings in complex terrain. In monsoon-driven flows, there are well set preferred directions of wind flow and this enables the characterization of the fully eddy structure in the vicinity of tall buildings. Another research implication would be the development of new turbulence closure models for eddy structure resolution for flow around complex building forms. Practical implications This study introduces a novel protocol at the planning stage of the upcoming residential complexes in proposed smart cities in the sub-continent. The results may well inform architects and structural engineers and help position and orient buildings in confined spaces and also ascertain the optimal glazing ratio, which affects the ventilation pattern. Social implications The results from this study can be used by town planners and architects in urban conurbations in the developing world. The results may well help lower heating ventilation and airconditioning loads. Energy-efficient buildings in developing countries are necessary because most of these have rapidly growing GDPs with a concomitant increase in energy consumption. Originality/value This novel study combining instrument mounted drone and CFDs shows for the first time how architects and town planners with a limited budget position and orient a group of buildings in a complex terrain.

Purpose The purpose of this paper is twofold: first, to identify and rank the challenges influencing the delivery of the housing public-private partnership (HPPP) in Tanzania; and second, to suggest solutions in the form of a conceptual public-private partnership (PPP) framework model that will address the identified challenges and boost the chances of success. Design/methodology/approach Using a convergent parallel (concurrent) mixed method approach, data were collected from 28 stakeholders involved with HPPP projects in Tanzania using a hand-delivered and e-mail survey and 13 semi-structured interviews with public and private sector respondents. The quantitative data included subjecting the 19 challenges as identified from the literature to parametric tests such as one-sample t-tests and descriptive statistics tests such as measures of central tendencies and frequency analysis through Statistical Package for Social Sciences (SPSS 22.0). Qualitative data employed content analysis. The research was further underpinned by a number of theoretical perspectives such as Gidden’s structuration theory, contingency theory, relational and equity theory. Findings The top five ranked challenges influencing the delivery of HPPP were “inadequate PPP skills and knowledge”; “poor contracting and tendering documents”; “inadequate project management”; “inadequate legal framework”; and “misinformation on financial capacity of private partners”. The least six ranked and most significant challenges based on the one-sample (single) t-tests were as follows: “Poor risk allocation”; “inexperienced private partner”; “unequal qualification and contributions of expertise”; “poor enabling environment to attract competent partners”; “inadequate mechanisms for recovery of private investors’ capital”; and “high costs in procuring PPP projects”. The qualitative study further confirmed the challenges and cited the reason for the failure of joint venture projects as the lack of motivation for undertaking similar PPP projects. Despite the increased awareness of PPP projects and associated marginal benefits, the main impediment to the uptake and delivery of PPP housing projects remained the lack of skills and expertise. Research limitations/implications The proposed framework model is not yet tested, but since this paper is part of the ongoing research, the next stage involves the testing and validation of the model. Future studies could test the applicability of the proposed framework in other HPPP projects in Tanzania, and in other similar developing countries. Second, the validated framework can contribute towards addressing similar challenges as well as providing guidance. The proposed framework model is not yet tested, but since this paper is part of the ongoing research, the next stage involves the testing and validation of the model. Furthermore, recommendation for future research is to test the alignment of the identified challenges to the proposed remedial solutions across the five phases within the proposed PPP framework with a number of case studies. Practical implications The identified challenges were used to form the basis of the framework presented in this paper. Furthermore, these provide useful information, thus leading to increased awareness to enable successful delivery of HPPP in Tanzania. Similarly, both the government and policy makers could use the findings as the basis for re-examining the existing PPP policy and regulations, and reflecting on the existing situation with a view to improving the delivery of future HPPP projects. Originality/value The empirical study is among the first that identifies and ranks the challenges of PPP for housing projects delivery within the Tanzanian context. The identification of the challenges enabled their ranking, resulting in the mapping out of the most critical challenges. Furthermore, using the Gidden’s structuration theory, the study illustrates how institution mechanisms (structures) address these delivery challenges, thus influencing the implementation of HPPP in Tanzania, and how individual stakeholders (human agents or agency) are able to make choices (advocated solutions) in dealing with the challenges. More so, these constraints (challenges) as identified and viewed through the contingency and equity theoretical lenses form the foundation for developing the PPP conceptual framework. The proposed framework would thus serve as a mechanism for providing practical solutions as well as reducing the level of severity of the identified challenges.

In the new issue, our scientific journal offers you nine scientific articles. As always, we try to offer a wide variety of topics and areas and follow current trends in the history of science and technology. The issue of the journal opens with an article dedicated to the formation and development of natural history museology in Europe in the 15th–19th centuries. The development of scientific knowledge at that time affects the idea of the world order and the place of man in it, and the combination of knowledge with practical experience leads to the birth of true science. It is shown that one of the most important components of the development of natural sciences, in particular biological sciences, was the collection of naturalia (i.e. objects of natural origin), the rapid surge of interest in which contributed to the Great Geographical Discoveries. In chronological order, the further historical development of museum work from private collections in Italy to the formation of a prototype of a genuine museum, which performs the main museum functions such as amassment, storage and demonstration of collections, is considered. The article by Leonid Griffen and co-authors considers the object and subject of the history of science and technology, its place in the system of sciences. Today, more and more people are turning to the factors that determine the interaction of the society with the environment (productive forces of the society), to study which in the historical aspect and called a special scientific discipline the history of science and technology. The composition and development of the technosphere and noosphere are considered in the article. It is shown that the functioning of the technosphere is based on its interaction with the noosphere, which provides information about the environment and controls the effectiveness of interaction with it. It is formed by combining the mental structures of individuals through sign systems. The production process that ensures the functioning of the society begins with the noosphere, which through individual consciousness controls the actions of each individual, who through the means of production (technosphere) interacts with the natural environment. However, the gradual development of productive forces leads at some point to the fact that the information needed by the individual to perform all necessary actions for the benefit of the society, ceases to fit in his individual consciousness. As a result, there is a new social phenomenon the social division of labor. The cardinal solution to the problem is the prospect of humanity entering infinite space. The article by Jun-Young Oh and Hyesook Han is devoted to the study of what Understanding mathematical abstraction in the formularization of Galileo's law. Galileo's revolution in science introduced an analytical method to science that typifies the overall modern thinking of extracting, abstracting, and grasping only critical aspects of the target phenomena and focusing on “how”, which is a quantitative relationship between variables, instead of “why”. For example, to him, the question of 'why does an object fall' is of no significance; instead, only the quantitative relationship between distance from the falling object and time is important. Yet, the most fundamental aspect of his idea is that he introduced a quantified time t. Because, according to atomic theory, vacuum exists between an atom and an object composed of atoms or between objects – ignoring factors that interfere with motion, such as friction – the space for absolute time, which is a mathematical time, can be geometrically defined. In order to justify this mathematical abstraction strategy, thought experiments were conducted rather than laboratory experiments, which at that time were difficult to perform. The article by Vasyl Andriiashko and co-authors provides a thorough overview of the evolutionary process of the emergence, establishment, and development of the Kyiv school of artistic textiles. It reveals the influence of various factors (ideological, political, economic, and aesthetic) on this process. The historical and factual method allowed us to study socio-economic, as well as historical and cultural factors that contributed to the emergence, establishment, and development of the Kyiv textile school in a chronological sequence. It is established that the very fact of emergence of the Kyiv school of artistic textile, as a community of style, unity of forms, preservation, and continuity of traditions, had unbiased backgrounds since Ukrainian decorative weaving, a part of which is Kyiv weaving, inherited the abundant artistic traditions that were created over the centuries and most vividly manifested through the art of Kyivan Rus. In the next article, the authors Artemii Bernatskyi and Mykola Sokolovskyi is devoted to the study history of military laser technology development in military applications. For better understanding and systematization of knowledge about development of historical applications in the military field, an analysis of publicly known knowledge about their historical applications in the leading world countries was conducted. The study focuses on development that was carried out by the superpowers of the Cold War and the present era, namely the United States, the Soviet Union and the Peoples Republic of China, and were built in metal. Multiple avenues of various applications of laser technology in military applications were studied, namely: military laser rangefinders; ground and aviation target designators; precision ammunition guidance systems; non-lethal anti-personnel systems; systems, designed to disable optoelectronics of military vehicles; as well as strategic and tactical anti-air and missile defense systems. The issues of ethical use of laser weapons and the risks of their use in armed conflicts, which led to an international consensus in the form of conventions of the United Nations and the International Committee of the Red Cross, were also considered. As a result of the analysis, a systematic approach to the classification of applications of laser technology in military products by three main areas of development was proposed: ancillary applications, non-lethal direct action on the human body and optical devices of military equipment, and anti-aircraft and anti-missile defensive systems. The author of the following article considered the front line transporter as the embodiment of the USSR military doctrine in the middle of the 20th century. The paper based on a source analysis of the history of creation, design, and production of LuAZ-967, LuAZ-967M, against the background of the processes of implementing projects of small tactical high mobility wheeled vehicles for the armies of European countries, shows that the developing, testing, and commissioning a front line transporter became a deepening of the process of motorization of the Soviet army. The designs of similar vehicles have been analyzed. An attempt to assess the degree of uniqueness of the front line transporter design and its place in the history of technology, as well as its potential as a reminder of science and technology has been made. An analysis of the front line transporter design, its systems, compared with its foreign counterparts, suggests that it is a Soviet refinement of the concept of a small army vehicle, a more specific means directly for the battlefield. At the same time, it was developed taking into account foreign developments and similar designs, imitating individual designs, adapting to the capabilities of the USSR automotive industry. The next article is devoted to the study, generalization and systematization of scientific knowledge about the history of the establishment, development and operation of the regional railway system in Bukovyna in the second half of XIX – early XX centuries. The authors attempted to analyze the process of creation and operation of railways in Bukovyna during the reign of the Austro-Hungarian Empire based on a wide range of previously unpublished archival documents, periodicals, statistical literature and memoirs. The article studies the development of organizational bases for the construction of railways, the activity of the communication network management, lists a whole range of requirements and tasks set for railway transport in Bukovyna, the progress of their implementation, considers successes and difficulties in this work. The purpose of the article by authors Sana Simou, Khadija Baba and Abderrahman Nounah is to reveal, recreate as accurately as possible the characteristics of an archaeological site or part of it. The restoration and conservation of monuments and archaeological sites is a delicate operation. It requires fidelity, delicacy, precision and archaeological authenticity. Research during the last two decades has proved that 3D modeling, or the digital documentation and visualization of archaeological objects in 3D, is valuable for archaeological research. The study has opted for the technique of terrestrial and aerial photogrammetry by 3D surveys of architectural elements, to develop an archetype of the deteriorated Islamic Marinid site (a dynasty between the 13th and 15th centuries), and the Roman site (25 BC), located at the Chellah archaeological site in Rabat and Salé cities. The data acquired build an architectural database to archive and retrieve the entire existing architecture of monuments. This study has been completed by photogrammetrists, architects, and restorers. The issue of the journal ends with an article devoted to the analyzing the prerequisites and conditions for the foundation of an aircraft engine enterprise in Ukraine. Based on the retrospective analysis, the prerequisites and conditions of the foundation of the aircraft engine enterprise in Aleksandrovsk, Ukraine, were considered. There was a severe gap between the Russian Empire and European countries in the development pace of the aviation industry during World War I. This prompted the Russian Empire to raise foreign capital, as well as attract technologies and specialists to develop aircraft engineering and other industries. By 1917, the plant had gained the status of Russia’s largest engine-building enterprise in terms of building area and one of the best in equipment. It is evident that the beginning of aircraft engine production in Aleksandrovsk relates to the establishment of a branch of Petrograd Joint Stock Company of Electromechanical Structures and the plant’s purchase from the Moznaim brothers. We hope that everyone will find interesting useful information in the new issue. And, of course, we welcome your new submissions.

As the population is growing and land becomes limited and new materials and construction technologies are built together, structural structures of this nature are growing larger and smaller, which are prone to two types of dynamic forces, tectonic drags and wind powers. In developing countries like India the exponential growth of the urban population has prompted a reassessment of the value of high – rise irregular buildings. For the construction of high - rise irregular buildings, the impact of gust loads is to be remembered. In India, gust caused numerous structural failures. IS 875:2015 Part-3 considers the gust loads on various kinds of irregular structures and IS 1893 (Part-1):2016 recognizes tectonic drags. The study focuses on peculiar constructions of different aspect ratios i.e. the impact of tears and tectonic drags. H / B ratio, with H being the overall construction system height; and B being the base width of the structure frame using STADD , Structure mass irregularities using E-TABS; from this paper we are examining the impact of wind (gusts), seismic (tectonical) load on building height by changing the number of floors with a the aspect rate. H / B ratio Many researchers design a system that is immune to tectonic drags, but the tectonic drag framework can not be built without causing damage. A large proportion of existing urban infrastructure is composed of vertical irregular structures.

The main goal for structure engineer is to do safety design and make sure structures can resist seismic forces by adopting proper construction materials and structure systems. The seismic design parameters are the key factors to control the structure seismic design procedures and results. These parameters covered several items, such as seismic spectral response acceleration in 1 second (S1) and short period (SS), site classification(A~E), sites importance (Ie,), strong motion files with their pseudo-acceleration and displacement, etc. Around these parameters, different countries and regions also issued the domestic design principles correspondence. For international projects, no matter which area or country projects located in, every structure engineer should take more care about the proper seismic parameters to deploy seismic design, and the issues of seismic parameter conversion among various codes appeared a few decades ago. In this article, author focused on multiple stories hotel (RC) structure design with GB and ASCE seismic parameters controlling, demonstrate the difference of structure design principles between GB and ASCE, and applied specified seismic parameters conversion method, then deploy structure analysis based on these parameters, got series structure analysis results. In the end, author provided a few practical advice about developing strategies and decisions from consultant view. These conclusions not only can benefit developers, also strengthen the support from consultant agency, besides, the parameter screen procedures enhanced the structure designer’s driving ability on various structures which locate in different regions and countries.

Purpose: generalization of long-term experience in the development of layout and design solutions for fish pass and spawning channels under the conditions of the Lower Don hydroelectric facilities system. The hydroelectric facilities cascade built on the Lower Don changed the conditions of fish anadromous migrations and spawning for the worse, which led to the undermining of commercial stocks and oppression of their populations. Under the current conditions, the existing drawback can be eliminated by the construction of fish pass and spawning channels at hydroelectric facilities. The demand for such structures and the lack of recommendations on their design determines the relevance of their development. Materials and methods. The basis of the development was the materials of the inspection of the existing canals at the Nikolaevsky and Konstantinovsky hydroelectric facilities and the design solutions of the Bagaevsky and Kochetovsky canals. When examining canals and developing their design solutions, generally accepted methods of scientific analysis, synthesis and design of hydraulic structures were used. Results and discussions. The advantages and disadvantages of the layout and design solutions of the existing fish pass and spawning channels are identified, and their flow rate and geometric parameters are determined. On the results of the survey, developments aimed at strengthening the advantages and eliminating the drawbacks of the design solutions for fish pass and spawning channels were made. Conclusions. The designs of the inlet and outlet heads which provide favorable conditions for entering fish migrating along the river into and out of the channel into the river are proposed. Proposals for the layout and design of the canal tract, which provides conditions for fish passage and (or) spawning in it are formulated. The schemes of constructions of recreation areas for fish and the methodology for assessing the quality of conditions that determine the efficiency of the adopted channel parameters for entering migrating fish into it are given. Recommendations for the improvement of layout and design solutions have been tested and implemented in the projects of the Bagaevsky and Kochetovsky fish pass and spawning canals.

Purpose: to develop structural solutions for recreation areas for fish, arranged on straight sections of fish channels. Materials and methods. The empirical basis for the development was the data of studies carried out on the existing fish passage channels and fish passage locks of the Don cascade of low-head river hydroelectric facilities, as well as materials from known and author's studies of the swimming ability and behavioral characteristics of anadromous migratory fish. When processing experimental data, methods of analysis and synthesis of experimental material were used, and when developing constructive solutions for recreation areas, experimental design technologies were used. Results and discussion. The initial materials of research on the existing fish passage structures (fish passage locks and fish passage channels) determined the need for construction of recreation areas for fish migrating through them in the fish passage channels. Structurally, recreation areas are formed by the arrangement of deepened or expanded sections of fish channels tracts, which makes it possible to reduce the flow velocities in them, increase the volume of living space and create conditions for restoring the energy potential of migrating aquatic organisms. The geometrical parameters and hydraulic characteristics of fish resting areas depend on the totality of interrelated morphometric and hydrological conditions of the canal tracts (determining the navigational conditions of migratory movement) and the biological features of anadromously migratory fish (mainly determined by swimming ability). Conclusions. General provisions for the design of recreation areas for fish are formulated, and their typical deepened, expanded and combined design solutions for the conditions of straight tracts of fish passages are developed. A typical solution for a different-depth and extended design of a recreation area has been tested (adapted) for fish-breeding, biological, topographic and hydrotechnical conditions of the Kochetovsky fish passage channel.

PurposeThe purpose of this article discusses the design of underground eco-houses using a dome structure of light construction while taking into account the historical experience of the development of the local population. This article considered the traditions of folk architecture and modern sophistication in the creation of energy-efficient eco-houses in foreign countries in the context of architecture and construction of affordable residential homes for the local population.Design/methodology/approachThe research presented in this paper was motivated by the need for developing agro-tourism facilities in hard-to-reach areas of the Silk Road in Southern Kazakhstan causes the construction of eco-houses built using local construction materials. Since ancient times in Southern Kazakhstan and during seasonal migrations in yurts of light construction, people have lived in mud-brick houses deep in the ground. Along with architectural and artistic solutions in building construction, great importance was attached to saving material resources, labour costs and achieving heat stability of residential buildings.FindingsIn the architectural and planning solution of the eco¬-house, progressive directions of construction of agrotechnical structures using renewable energy sources are adopted. Particular importance was given to the choice of the construction site on an elevated area nearby historical monuments and a favourable season for the construction of eco-houses with considering the natural and climatic characteristics of rural areas of Southern Kazakhstan.Research limitations/implicationsThis paper discussed the issues of insulation, ventilation and improving the eco-house microclimate comfort using local building materials. Improving the architectural and artistic expressiveness of the eco-house in terms of the tradition of folk architecture was also explicitly discussed in this paper.Practical implicationsTables with the justification of expediency of construction of economical eco-houses in natural and climatic conditions of Kazakhstan and Central Asia are provided. The results help to improve the energy efficiency of eco-houses in Kazakhstan by using renewable energy sources.Social implicationsSocial benefits are associated with the use of local raw materials. Eco-houses built from traditional building materials can become accessible to a wide range of people and stimulate the development of small businesses. This may be associated with the construction of eco-houses to serve visiting tourists in remote picturesque oases, as well as the manufacture of dome structures, felt products and the preparation of reed panels and so on.Originality/valueThe thermotechnical characteristics of the region's ground energy are given, which can significantly save the cost of heating the eco-house. Solutions for optimal insolation, ventilation of the eco-house are provided, taking into account the natural and climatic conditions of Southern Kazakhstan.

AbstractAll around the world, non-engineered masonry constructions (NECs) typically have high vulnerability to seismic ground motion, resulting in heavy damage and severe casualties after earthquakes. Even though a number of computational strategies have been developed for seismic analysis of unreinforced masonry structures, a few studies have focussed on NECs located in developing countries. In this paper, different modelling options for finite element analysis of non-engineered masonry buildings are investigated. The goal of the study was to identify the modelling option with the best trade-off between computational burden and accuracy of results, in view of seismic risk assessment of NECs at regional scale. Based on the experimental behaviour of a single-storey structure representative of Indian non-engineered masonry buildings, the output of seismic response analysis of refined 3D models in ANSYS was compared to that of a simplified model based on 2D, nonlinear, layered shell elements in SAP2000. The numerical-experimental comparison was carried out under incremental static lateral loading, whereas nonlinear time history analysis was performed to investigate the dynamic performance of the case-study structure. Analysis results show that the simplified model can be a computationally efficient modelling option for both nonlinear static and dynamic analyses, particularly in case of force-based approaches for design and assessment of base isolation systems aimed at the large-scale seismic vulnerability mitigation of NECs.

BIM has had a significant influence on the building and construction industry, contributing to efficiency, productivity, and cost-effectiveness improvements. BIM technology’s integrative nature makes it a perfect platform for adopting sustainable techniques in new construction, renovation, and retrofitting of existing structures. Saudi Arabia’s market gasoline prices fell drastically between 2018 and 2020, forcing the Kingdom to create its 2030 vision. The 2030 vision seeks to transform the Kingdom of Saudi Arabia (KSA) into an ideal sustainable society by lowering its dependency on oil and constructing more sustainable buildings and infrastructures. The number of green buildings and high-performance buildings in the KSA is inadequate, and the rate of change is too slow. Due to KSA’s need to enhance its built environment, it established a new green building rating named “Mostadam.” Currently, there is no metric to measure the roadmap to achieve the aspects of the KSA’s 2030 vision, and the number of green buildings in the KSA is very low compared to other countries. Therefore, there is an urgent need to translate the KSA’s green objectives into effective regulations. To attain this goal, there must be uniformity across jurisdictions in order to make sound and well-informed decisions about adopting and enforcing sustainability. This research intends to focus on the advanced capability of using BIM and creating a BIM-Based model to help facilitate the green building certification in Saudi Arabia that supports its vision of 2030. The research proposes a new strategy based on the integration of BIM and Mostadam green building rating systems where a BIM plug-in can aid in achieving the 2030 envisioned water sustainability goal and implement sustainable design principles in Saudi Arabia. Autodesk Revit and Dynamo were used for programming and visualizing the model. The model focused on one main category of Mostadam’s Green Building Rating System: water conservation. This study used a mixed methodology that combines qualitative and quantitative approaches. Phase I of this study focuses on the literature review and collection of available data about BIM, Green Building Rating Systems, and the KSA 2030 vision. Phase II aims at collecting data from an online survey sent to AEC professionals. Moreover, phase II of this study includes developing a BIM-Based model using Autodesk Revit and Dynamo. Phase III embraces the validation of the model using a prototype and a case study. Driven from the data collected, the new BIM-Based model assisted in achieving the KSA 2030 vision by reducing the water consumption when compared to the baseline water consumption. The model’s constraints are presented along with future phases of the study.

Cultural Studies has tended to prioritise the domain of leisure and consumption over work as an area for meaning making, in many ways defining everyday life in opposition to work. Greg Noble, a cultural researcher who examined work in the context of the early computerisation of Australian universities made the point that "discussions of everyday life often make the mistake of assuming that everyday life equates with home and family life, or leisure" (87). This article argues for the need within Cultural Studies to focus on work and media as a research area of everyday life. With the growth of flexible and creative labour and the widespread uptake of an array of new media technologies used for work, traditional ways to identify and measure the space and time of work have become increasingly flawed, with implications for how we account for work and negotiate its boundaries. New approaches are needed to address the complex media environments and technological practices that are an increasing part of contemporary working life. Cultural Studies can make a significant impact towards this research agenda by offering new ways to analyse the complex interrelations of space, time and technology in everyday work practice. To further this goal, a new material practices account of work termed Officing is introduced, developed through my doctoral research on professionals' daily use of information and communication technology (ICT). This approach builds on the key cultural concepts of "bricolage" and "appropriation" combined with the idea of "articulation work" proposed by Anselm Strauss, to support the analysis of the office workplace as a contingent and provisional arrangement or process. Officing has a number of benefits as a framework for analysing the nature of work in a highly mediated world. Highlighting the labour that goes into stabilising work platforms makes it possible to assess the claims of productivity and improved work-life balance brought about by new mobile media technologies; to identify previously unidentified sources of time pressure, overwork and intensification and ultimately, to contribute to the design of more sustainable work environments. The Turn Away from Work Work held a central position in social and cultural analysis in the first half of the twentieth century but as Strangleman observed, there was a marked shift away from the study of work from the mid 1970s (3.1). Much of the impulse for this shift came from critiques of the over-emphasis on relations of production and the workplace as the main source of meaning and value (5.1). In line with this position, feminist researchers challenged the traditional division of labour into paid and unpaid work, arguing that this division sustained the false perception of domestic work as non-productive (cf. Delphy; Folbre). Accompanying these critiques were significant changes in work itself, as traditional jobs literally began to disappear with the decline of manufacturing in industrialised countries (6.1). With the turn away from work in academia and the changes in the nature of work, attention shifted to the realm of the market and consumption. One of the important contributions of Cultural Studies has been the focus on the role of the consumer in driving social and technological change and processes of identity formation. Yet, it is a major problem that work is largely marginalised in cultural research of everyday life, especially since, in most industrialised nations, we are working in new ways, in rapidly changing conditions and more than ever before. Research shows that in Australia there has been a steady increase in the average hours of paid work and Australians are working harder (cf. Watson, Buchanan, Campbell and Briggs; Edwards and Wajcman). In the 2008 Australian Work and Life Index (AWALI) Skinner and Pocock found around 55 per cent of employees frequently felt rushed or pressed for time and this was associated with long working hours, work overload and an overall poor work–life interaction (8). These trends have coincided with long-term changes in the type and location of work. In Australia, like many other developed countries, information-based occupations have taken over manufacturing jobs and there has been an increase in part-time and casual work (cf. Watson et al.). Many employees now conduct work outside of the traditional workplace, with the ABS reporting that in 2008, 24 per cent of employees worked at least some hours at home. Many social analysts have explained the rise of casual and flexible labour as related to the transition to global capitalism driven by the expansion of networked information processes (cf. Castells; Van Dijk). This shift is not simply that more workers are producing ideas and information but that the previously separated spheres of production and consumption have blurred (cf. Ritzer and Jurgenson). With this, entirely new industries have sprung up, predicated on the often unpaid for creative labour of individuals, including users of media technologies. A growing chorus of writers are now pointing out that a fragmented, polarised and complex picture is emerging of this so-called "new economy", with significant implications for the quality of work (cf. Edwards and Wajcman; Fudge and Owens; Huws). Indeed, some claim that new conditions of insecure and poor quality employment or "precarious work" are fast becoming the norm. Moreover, this longer-term pattern runs parallel to the production of a multitude of new mobile media technologies, first taken up by professionals and then by the mainstream, challenging the notion that activities are bound to any particular place or time. Reinvigorating Work in Social and Cultural Analysis There are moves to reposition social and cultural analysis to respond to these various trends. Work-life balance is an example of a research and policy area that has emerged since the 1990s. The boundary between the household and the outside world has also been subject to scrutiny by cultural researchers, and these critically examine the intersection between work and consumption, gender and care (cf. Nippert-Eng; Sorenson and Lie; Noble and Lupton, "Consuming" and "Mine"; Lally). These responses are examples of a shift away from what Urry has dubbed "structures and stable organisations" to a concern with flows, movements and the blurring of boundaries between life spheres (5). In a similar vein, researchers recently have proposed alternative ways to describe the changing times and places of employment. In their study of UK professionals, Felstead, Jewson and Walters proposed a model of "plural workscapes" to explain a major shift in the spatial organisation of work (23). Mobility theorists Sheller and Urry have called for the need to "develop a more dynamic conceptualisation of the fluidities and mobilities that have increasingly hybridised the public and private" (113). All of this literature has reinforced a growing concern that in the face of new patterns of production and consumption and with the rise of complex media environments, traditional models and measures of space and time are inadequate to account for contemporary work. Analyses that rely on conventional measures of work based on hourly units clearly point to an increase in the volume of work, the speed of work and to the collision (cf. Pocock) of work and life but fall down in accounting for the complex and often contradictory role of technology. Media technologies are "Janus-faced" as Michael Arnold has suggested, referring to the two-faced Roman god to foreground the contradictory effects at the centre of all technologies (232). Wajcman notes this paradox in her research on mobile media and time, pointing out that mobile phones are just as likely to "save" time as to "consume" it (15). It was precisely this problematic of the complex interactions of the space, time and technology of work that was at stake in my research on the daily use of ICT by professional workers. In the context of changes to the location, activity and meaning of work, and with the multiplying array of old and new media technologies used by workers, how can the boundary and scope of work be determined? What are the implications of these shifting grounds for the experience and quality of work? Officing: A Material Practices Account of Office Work In the remaining article I introduce some of the key ideas and principles of a material practices account developed in my PhD, Officing: Professionals' Daily ICT Use and the Changing Space and Time of Work. This research took place between 2006 and 2007 focusing in-depth on the daily technology practices of twenty professional workers in a municipal council in Sydney and a unit of a global telecommunication company taking part in a trial of a new smart phone. Officing builds on efforts to develop a more accurate account of the space and time of work bringing into play the complex and highly mediated environment in which work takes place. It extends more recent practice-based, actor-network and cultural approaches that have, for some time, been moving towards a more co-constitutive and process-oriented approach to media and technology in society. Turning first to "bricolage" from the French bricole meaning something small and handmade, bricolage refers to the ways that individuals and groups borrow from existing cultural forms and meanings to create new uses, meanings and identities. Initially proposed by Levi-Strauss and then taken up by de Certeau, bricolage has been a useful concept within subculture and lifestyle studies to reveal the creative work performed on signs and meaning systems in forming cultural identities (cf. O'Sullivan et al.). Bricolage is also an important concept for understanding how meanings and uses are inscribed into forms in use rather than being read or activated off their design. This is the process of appropriation, through which both the object and the person are mutually shaped and users gain a sense of control and ownership (cf. Noble and Lupton; Lally; Silverstone and Haddon). The concept of bricolage highlights the improvisational qualities of appropriation and its status as work. A bricoleur is thus a person who constructs new meanings and forms by drawing on and assembling a wide range of resources at hand, sourced from multiple spheres of life. One of the problems with how bricolage and appropriation has been applied to date, notwithstanding the priority given to the domestic sphere, is the tendency to grant individuals and collectives too much control to stabilise the meanings and purposes of technologies. This problem is evident in the research drawing on the framework of "domestication" (cf. Silverstone and Haddon). In practice, the sheer volume of technologically-related issues encountered on a daily basis and the accompanying sense of frustration indicates there is no inevitable drift towards stability, nor are problems merely aberrational or trivial. Instead, daily limits to agency and attempts to overcome these are points at which meanings as well as uses are re-articulated and potentially re-invented. This is where "articulation work" comes in. Initially put forward by Anselm Strauss in 1985, articulation work has become an established analytical tool for informing technology design processes in such fields as Computer-Supported Cooperative Work (CSCW) and Workplace Studies. In these, articulation work is narrowly defined to refer to the real time activities of cooperative work. It includes dealing with contingencies, keeping technologies and systems working and making adjustments to accommodate for problems (Suchman "Supporting", 407). In combination with naturalistic investigations, this concept has facilitated engagement with the increasingly complex technological and media environments of work. It has been a powerful tool for highlighting practices deemed unimportant but which are nevertheless crucial for getting work done. Articulation work, however, has the potential to be applied in a broader sense to explain the significance of the instability of technologies and the efforts to overcome these as transformative in themselves, part of the ongoing process of appropriation that goes well beyond individual tasks or technologies. With clear correspondences to actor-network theory, this expanded definition provides the basis for a new understanding of the office as a temporary and provisional condition of stability achieved through the daily creative and improvisational activities of workers. The office, then, is dependent on and inextricably bound up in its ongoing articulation and crucially, is not bound to a particular place or time. In the context of the large-scale transformations in work already discussed, this expanded definition of articulation work helps to; firstly, address how work is re-organised and re-rationalised through changes to the material conditions of work; secondly, identify the ongoing articulations that this entails and thirdly; understand the role of these articulations in the construction of the space and time of work. This expanded definition is achieved in the newly developed concept of officing. Officing describes a form of labour directed towards the production of a stable office platform. Significantly, one of the main characteristics of this work is that it often goes undetected by organisations as well as by the workers that perform it. As explained later, its "invisibility" is in part a function of its embodiment but also relates to the boundless nature of officing, taking place both inside and outside the workplace, in or out of work time. Officing is made up of a set of interwoven activities of three main types: connecting, synchronising and configuring. Connecting can be understood as aligning technical and social relations for the performance of work at a set time. Synchronising brings together and coordinates different times and temporal demands, for example, the time of "work" with "life" or the time "out in the field" with time "in the workplace". Configuring prepares the space of work, making a single technology or media environment work to some planned action or existing pattern of activity. To give an example of connecting: in the Citizens' Service Centre of the Council, Danielle's morning rituals involved a series of connections even before her work of advising customers begins: My day: get in, sit down, turn on the computer and then slowly open each software program that I will need to use…turn on the phone, key in my password, turn on the headphones and sit there and wait for the calls! (Humphry Officing, 123) These connections not only set up and initiate the performance of work but also mark Danielle's presence in her office. Through these activities, which in practice overlap and blur, the space and time of the office comes to appear as a somewhat separate and mostly invisible structure or infrastructure. The work that goes into making the office stable takes place around the boundary of work with implications for how this boundary is constituted. These efforts do not cluster around boundaries in any simple sense but become part of the process of boundary making, contributing to the construction of categories such as "work" and "life". So, for example, for staff in the smart phone trial, the phone had become their main source of information and communication. Turning their smart phone off, or losing connectivity had ramifications that cascaded throughout their lifeworld. On the one hand, this lead to the breakdown of the distinction between "work" and "life" and a sense of "ever-presence", requiring constant and vigilant "boundary work" (cf. Nippert-Eng). On the other hand, this same state also enabled workers to respond to demands in their own time and across multiple boundaries, giving workers a sense of flexibility, control and of being "in sync". Connecting, configuring and synchronising are activities performed by bodies, producing an embodied transformation. In the tradition of phenomenology, most notably in the works of Heidegger, Merleau-Ponty and more recently Ihde, embodiment is used to explain the relationship between subjects and objects. This concept has since been developed to be understood as not residing in the body but as spread through social, material and discursive arrangements (cf. Haraway, "Situated" and Simians; Henke; Suchman, "Figuring"). Tracing efforts towards making the office stable is thus a way of uncovering how the body, as a constitutive part of a larger arrangement or network, is formed through embodiment, how it gains its competencies, social meanings and ultimately, how workers gain a sense of what it means to be a professional. So, in the smart phone trial, staff managed their connections by replying immediately to their voice, text and data messages. This immediacy not only acted as proof of their presence in the office. It also signalled their commitment to their office: their active participation and value to the organisation and their readiness to perform when called on. Importantly, this embodied transformation also helps to explain how officing becomes an example of "invisible work" (cf. Star and Strauss). Acts of connecting, synchronising and configuring become constituted and forgotten in and through bodies, spaces and times. Through their repeated performance these acts become habits, a transparent means through which the environment of work is navigated in the form of skills and techniques, configurations and routines. In conclusion, researching work in contemporary societies means confronting its marginalisation within cultural research and developing ways to comprehend and measure the interaction of space, time and the ever-multiplying array of media technologies. Officing provides a way to do this by shifting to an understanding of the workplace as a contingent product of work itself. The strength of this approach is that it highlights the creative and ongoing work of individuals on their media infrastructures. It also helps to identify and describe work activities that are not neatly contained in a workplace, thus adding to their invisibility. The invisibility of these practices can have significant impacts on workers: magnifying feelings of time pressure and a need to work faster, longer and harder even as discrete technologies are utilised to save time. In this way, officing exposes some of the additional contributions to the changing experience and quality of work as well as to the construction of everyday domains. Officing supports an evaluation of claims of productivity and work-life balance in relation to new media technologies. In the smart phone trial, contrary to an assumed increase in productivity, mobility of work was achieved at the expense of productivity. Making the mobile office stable—getting it up and running, keeping it working in changing environments and meeting expectations of speed and connectivity—took up time, resulting in an overall productivity loss and demanding more "boundary work". In spite of their adaptability and flexibility, staff tended to overwork to counteract this loss. This represented a major shift in the burden of effort in the production of office forms away from the organisation and towards the individual. Finally, though not addressed here in any detail, officing could conceivably have practical uses for designing more sustainable office environments that better support the work process and the balance of work and life. Thus, by accounting more accurately for the resource requirements of work, organisations can reduce the daily effort, space and time taken up by employees on their work environments. In any case, what is clear, is the ongoing need to continue a cultural research agenda on work—to address the connections between transformations in work and the myriad material practices that individuals perform in going about their daily work. References Arnold, Michael. "On the Phenomenology of Technology: The 'Janus-Faces' of Mobile Phones." Information and Organization 13.4 (2003): 231–56. Australian Bureau of Statistics. 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