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Brambila, Gabriela, Mireya Moleres, Joel Amarillas, Blake Brennan, Haley Koesters, and Nawar Sadeq. "Design of Multistory Historical LEED Building." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/578568.
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The goal of this project was to design a multipurpose three-story building that creates a new hub for businesses and student housing, encompassing a complete transportation, hydrological, structural, and geotechnical design of the building and site while adhering to all applicable building codes. Based on calculations of expected daily trips, turning movement analysis, and Highway Capacity Software analysis, the new site plan is designed to optimize parking spaces, landscaped areas, and access. Along with a newly designed grading plan, a hydrological flood analysis was done to design underground stormwater storage tanks and the final grading plan. The building itself was designed as a steel-braced moment frame designed to support gravity, wind, and seismic loading per the LRFD procedure. Utilizing the LRFD critical load combination the most economical size of structural members including beams, columns, girders, lateral bracing, and connections where chosen. The design was then entered into SAP2000 to model the building behavior. Given the column loads and soil properties, the site s soil bearing capacity was calculated to design isolated footings with reinforcing tensile rebar. Decisions were made to use recycled materials and energy and water efficient systems in order to achieve LEED Platinum accreditation.
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Farooq, Qureshi Harris, and Aber Alvi. "Evaluation of Building Integrated Heating System in Terms of Thermal Comfort & Energy Efficiency : A Case Study of Multistory Apartment Buildings in Kumla." Thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12898.
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This work comprises of a detail study of the impact of building integrated heating (BIH) systems on energy efficiency and thermal comfort. The work has been sponsored by a company called Thermotech AB which supplied the BIH system for twin apartment buildings in Kumla owned by Kumla Bostäder. Comprehensive energy analysis was done using IDA simulation software for the building with normal radiator heating and BIH heating systems. The analysis showed 7.5 % annual savings in favor of the BIH system but since the ground and first floor thermostatic set point was not achieved we are a bit skeptical about the actual savings. Detailed literature study in this regard showed that there was no significant difference in the energy consumption for both of the systems. In the case of thermal comfort there are many citations preferring the integrated heating with features like better comfort, air quality, less noisy system ,flexible room layout and ability to use a sustainable source such as solar power. Simulations for thermal comfort were unable to determine any significant betterment of one system over the other as both were theoretically able to deliver the same comfort. Actual measurements however showed extremely good PPD % values during a hot summer day. Unfortunately a winter measurement could not be taken due to time constraint but is a strong recommendation for further work. A detailed survey was also conducted to gauge the people’s reaction on the system during the past winter. While most of the people were satisfied average PMV of around 0.5, people from lower floors did complain about it being too cold during the winter. Some complained about it being too warm during summer time which is understandable as there no external shades and the ventilation system runs at constant speed. Some people had complains about the air quality and lack of ventilation as well. In conclusion the system’s superior thermal comfort over the conventional radiator circuit cannot be denied but its energy efficiency features may be up for debate. We recommend the system in spite of the additional cost due to the comfort for the occupants and the fact that it utilizes a low temperature source which is much more sustainable and environment friendly then the conventional high temperature sources.
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Magalhães, Wladimir Capelo. "O uso do aço no projeto arquitetônico das estruturas aparente em edifícios de múltiplos andares: uma análise a partir dos projetos em aço construídos nos últimos 20 anos em São Paulo." Universidade Presbiteriana Mackenzie, 2015. http://tede.mackenzie.br/jspui/handle/tede/392.
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The use of steel structures as building system in multistory buildings is growing every year in Brazil. This evolution, though still slow compared to other countries, is possible thanks to the characteristics of steel and the manufacturing process and production of steel structures. This research paper presents an analysis the use of steel structures in multistory buildings constructed in Sao Paulo in the last 20 years, showing how the use of metal structures was essential to solve the specific problems of each challenge. For this it was essential to understand how metal structures historically evolved since the eighteenth century. From this historical survey, it was possible to establish a series of conditions in the specific use of steel structures that provided its evolution. In addition, there was a survey about the steel industry in Brazil, with an overview of their production, properties, advantages and limitations in order to understand how these characteristics are reflected in the construction of multistory buildings. In the project analysis, seven works were chosen in São Paulo who used the apparent steel structure as the main construction system so that the design adopted confirm structural solutions proposed by architects. To support the analysis, were considered graphics, photos, interviews and three-dimensional electronic models that facilitate the understanding of the structure and elucidate the importance of the use of metal structures. With the results, it was possible to define a set of constraints and determinants of the use of steel in construction that must be considered in the development of architectural design.
O uso das estruturas metálicas como sistema construtivo nas edificações de múltiplos andares vem crescendo a cada ano no Brasil. Essa evolução, embora ainda lenta em comparação a outros países, se dá graças a uma série de características próprias do aço e do processo de fabricação e de produção das estruturas metálicas. Esse trabalho de pesquisa apresenta uma análise do uso das estruturas em aço no projeto de edifícios de múltiplos andares construídos em São Paulo nos últimos 20 anos, evidenciando como o emprego das estruturas metálicas foi essencial para resolver os problemas projetuais específicos de cada obra apresentada. Para isso, foi fundamental compreender como as estruturas metálicas evoluíram historicamente na construção civil desde o século XVIII, pois a partir desse levantamento histórico, foi possível pontuar uma série de condicionantes do uso das estruturas em aço que proporcionaram a sua evolução como sistema construtivo na forma como se apresenta hoje. Além disso, foi realizado um levantamento a respeito da indústria do aço no Brasil, traçando um panorama da sua produção, propriedades, vantagens e limitações a fim de compreender como essas características se refletem nos condicionantes e determinantes do aço na construção de edifícios de múltiplos andares. Como metodologia de análise, foram escolhidas sete obras na cidade de São Paulo que utilizaram a estrutura metálica aparente em aço como principal sistema construtivo, de forma que a linguagem adotada evidenciasse as soluções estruturais propostas pelos arquitetos. Para apoiar a análise, foram considerados desenhos, fotos, entrevistas e maquetes eletrônicas tridimensionais que facilitassem a compreensão da estrutura e elucidassem a importância do emprego das estruturas metálicas. Com os resultados obtidos, foi possível definir um conjunto de condicionantes e determinantes do uso do aço que deve ser considerado no desenvolvimento do projeto arquitetônico.
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Widodo. "Rocking of multistorey buildings." Thesis, University of Canterbury. Civil Engineering, 1995. http://hdl.handle.net/10092/5973.
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In the past few decades, engineers have realized that an appropriate estimation of energy dissipation on the structural system is one of the important roles in aseismic design of building structures located in hazardous seismic areas H26,P26,V9. The inelastic load-deformation behaviour of the structural members and vibration of the foundations on the flexible soil medium are two important features of the energy dissipation. Soil-structure interaction is the way to refine the existing common methods in structural analysis as it able to take into account the soil-foundation energy dissipation from the structural system.
Study of the response of building structures supported by a soil medium using lumped parameter methods have been carried out by some researchers. However, most of these studies used unrealistic physical or structural responses and soil-foundation models which did not have real application in modern building aseismic design. The current New Zealand code NZS 4203:1992 states that a special study should be carried out where energy dissipation in the structural system is primarily through the rocking of foundations.
Analytical investigations using the same methods in more realistic applications of aseismic design in building structures was carried out. The investigations cover several inelastic damage indicators for both frames and frame-wall structures with a different numbers of storeys, numbers of frames, hysteresis rules, rigid joint lengths, supported by different foundation types, soil models, soil stiffnesses and exited by different earthquake inputs. It was found that rocking structures exhibit advantages or disadvantages and show the inadequacy of the current wall moment design envelopes for frame-wall structures.
Methods to overcome the disadvantages need to be developed. A new simple wall moment design envelope for different types of foundation and soil-foundation hysteresis rules has been proposed. In addition, the minimum required static bearing capacity factor for soil-under minimum wall gravity load and the approximation of the building's lateral fixity are also discussed.
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Škodová, Veronika. "Nárožní polyfunkční dům v Táboře." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225794.
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Charng, Peng-Hsiang. "Base isolation for multistorey building structures." Thesis, University of Canterbury. Civil Engineering, 1998. http://hdl.handle.net/10092/5851.
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Earthquakes are one of nature’s greatest hazards; throughout historic time they have caused significant loss of life and severe damage to property, especially to man-made structures. On the other hand, earthquakes provide architects and engineers with a number of important design criteria foreign to the normal design process. From well established procedures reviewed by many researchers, seismic isolation may be used to provide an effective solution for a wide range of seismic design problems.
The application of the base isolation techniques to protect structures against damage from earthquake attacks has been considered as one of the most effective approaches and has gained increasing acceptance during the last two decades. This is because base isolation limits the effects of the earthquake attack, a flexible base largely decoupling the structure from the ground motion, and the structural response accelerations are usually less than the ground acceleration.
In this research, a series of dynamic analyses are carried out to investigate in detail the seismic responses for stiff and flexible 12-storey multi storey buildings to the various isolation systems and to consider the effects of foundation compliance on their responses when subjected to different earthquakes. At the same time, an investigation of the seismic response of the recently suggested segmental buildings is carried out. The segmental building concept can be considered as an extension of the conventional base isolation technique with additional flexibility distributed in the superstructure. In addition to the conventional isolation system placed at the base, the superstructure of segmental buildings is further divided into several segments which are interconnected by extra isolation systems located in the upper storeys.
In general, the increase of additional viscous damping in the structure may reduce displacement and acceleration responses of the structure. This study also seeks to evaluate the effects of additional damping on the seismic response when compared with structures without additional damping for the different ground motions. In addition, analysis and design considerations for base isolated and segmental structures are suggested to enable the designer to get a better understanding at the preliminary design stage.
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Marshall, John Richard. "A comparative study of analysis techniques for multistory concrete frames." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19035.
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Duke, Jessica (Jessica Anne). "Multi-objective optimization for structure and energy in the case of multistory buildings with atriums." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104196.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 69-71).
This research shows that a successful workflow exists that compares structural efficiency with operational energy efficiency for buildings that incorporate natural ventilation practices. The parametric model successfully generates floor-framing plans with atriums that are similar to industry standards. Furthermore, this research follows a workflow that allows one to search through a series of building designs to find options that minimize embodied energy while maintaining a minimum usable square footage. The models generated in Rhino can then quickly be analyzed in SimCFD to find the cooling and natural lighting potentials. A review of the results generated in this thesis answers the questions: "How far can we push structural optimization while designing for occupant comfort using natural ventilation and buoyancy effects? And 2) What constraints are put on a building's global design when cooling and heating is accomplished with natural air flows?"
by Jessica Duke.
M. Eng.
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Ahmad, Sabarinah Sh. "A study on thermal comfort and energy performance of urban multistorey residential buildings in Malaysia /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe.pdf.
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Vaičiulytė, Marija. "Atspindžio interpretacijos abstrakčioje tapyboje." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090211_110032-37347.
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Magistrinio darbo temą pasirinkau – „Atspindžio interpretacijos abstrakčioje tapyboje“. Kolekcijoje tapau efemeriškus vaizdus, kuriuos pastebėjau ant stiklinių daugiaaukščių pastatų, pamatytus atspindžio vaizdus norėjau įamžinti tapyboje. Kolekciją atlikau dviejų stilių deriniu – geometrine abstrakcija ir veiksmo tapyba (abstraktusis ekspresionizmas), nes šie deriniai tokie parodoksalūs. Sąmoningai atsisakiau optinio meno. Svarbiausia darbe įsikišimas realybės – dangaus vaizdai atspindyje. Tapybos kūrinuose – atspindys užpildo architektūros tuštumą. Kolekcijoje „Atspindžio interpretacijos abstrakčioje tapyboje“ ieškojau harmonijos ir pusiausvyros, taip pat jiems giminingų aspektų, tokių, kaip pasikartojimai, supriešinimai statiškos geometrijos ir judesio, variacijos ir simetrijos, stengiausi sukurti išbaigtą darnų, juntamą dviem lygmenimis atvaizdo ir vaizdinio junginį. Aštuoni kolekcijos paveikslai labai skirtingi, vienuose išryškinau atspindžio siluetą, kituose labai svarbus konstrukcijos erdviškumas, dar kitus perteikiau labai dekoratyviai.I choose theme of master‘s degree work – „Reflection interpretation in abstrakt paintings“. In paintings collection I paint ephemeral reflection view, this reflection I saw on the multistory buildings. I want to perpetuate in my paintings view of reflection. I was painting my collection with two different styles combination – of abstract geometry and abstract expressionism, because this combination is very paradoxical. Conscious i do not use optical art. Above all in paintings are intervention of reality – view of sky in reflection. In collection "Reflection interpretation in abstract paintings" I look for harmony and equilibrium, also similar aspects, like repetition, contrary static geometry and movements, variation and symmetry. I try to create completed painting, palatable by two sides like picture and image combination. Seven collection paintings are very different, one of them I try to bring to light reflection silhouette, in next painting are very important spatial character of construction, in others paintings are important decorative.
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Ravi, Mathi. "Knowledge-based system approach to integrated design of multistorey office buildings at the preliminary stage." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/NQ40307.pdf.
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Ferrante, Cavallaro Giovanni. "Pseudo dynamic tests and numerical analysis of free from damage multistorey steel buildings with innovative connections." Doctoral thesis, Universita degli studi di Salerno, 2019. http://elea.unisa.it:8080/xmlui/handle/10556/4277.
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2017 - 2018One of the most widespread structural systems is represented by Moment Resisting Frames (MRFs). resistant seismic frames. This structural system is made up of frames capable of resisting seismic actions through predominantly flexural tension states. The stiffness and lateral resistance of the system depend on the flexural strength of the members and the type of connection, while the development of the plastic hinges guarantee the dissipation of the seismic input energy. The location of the dissipative zones varies according to the design approach adopted, typically they develop in beams, columns and connections. The most widespread design philosophy is to have strong columns, weak beams and full-strength rigid connections with complete resistance restoration, in this way all the seismic energy tends to be dissipated by the plastic hinges at the ends of the beams and at the base of the columns of the first level. In order to overcome the traditional design approach, the present research work introduces a new type of beam-column connection capable of exhibiting a remarkable rigidity in service conditions (SLE) and able to exhibit a remarkable dissipative capacity when a rare seismic event occurs. The codes currently in force provide that for seismic events characterized by a period of return comparable with the useful life of the structure (frequent or occasional events) the structures remain in the elastic field ensuring that the seismic energy is completely dissipated through viscous damping. Vice versa, the seismic energy must be dissipated through plastic engagement of parts of the structure, with wide and stable hysteresis cycles, for rare and very rare seismic events with a return period of about 500 years. The development of the hysteresis involves structural damage that have to be such as not to lead to the collapse of the structure in order to guarantee the protection of the life of those who occupy the building. The prediction of the behaviour of the structure in non-linear field for rare seismic events represents an aspect that only experimental research can describe in depth by developing new analytical models and innovative design philosophies. The execution of quasi-static tests can provide useful information in order to investigate the nonlinear behaviour of the members and the assemblages even if the forces or the displacement histories applied during the tests do not correspond exactly to the actions that occur during a real seismic event. The information obtained through these test procedures is however useful for calibrating analytical models and comparing the behaviour of structural components. The execution of tests on real scale structures is the best way to investigate the global behaviour of a structural system. For a more complete knowledge about the response in the dynamic field, the pseudo-dynamic tests represent a test protocol able to provide information of the structural response of a component or of a structure in a dynamic field through a static test. The main purpose of this work, developed within the FREEDAM research project financed by the European Community, is to develop an innovative beam-column connection. These innovative connections are equipped with an additional damper able to dissipating the energy deriving from destructive seismic events. The FREEDAM beam-column connection, through an appropriate design of the various components, is able to withstand frequent earthquakes and rare events without causing damage to the structural elements. The thesis is divided into six chapters. The Chapter 1 reports a brief introduction to the traditional beam-column connections, specifying the characteristics of the different types of connection and their influence on the behaviour of the Moment Resisting Frames. In the last part of the chapter the FREEDAM dissipative connection is presented, specifying its peculiarities and the benefits that its introduction into the structural system brings. The Chapter 2 is devoted to the description of the results obtained from an extensive experimental campaign developed at the STRENGTH laboratory of the University of Salerno, for the choice of material for the friction dampers used in the FREEDAM connections by carrying out a statistical characterization of the static and dynamic friction coefficients. The Chapter 3 collects the results of a further experimental campaign carried out at the University of Salerno laboratory and aimed at studying the tightening losses for pre-loading bolt systems equipped with different washers. In Chapter 4 a design procedure has been define for the FREEDAM beam-column connections, then this procedure has been applied in order to design two different types of connections that have been experimentally tested at the University of Coimbra Laboratory (PT). In the same chapter, the test layouts and the results obtained from the cyclic tests carried out on the nodes equipped with FREEDAM friction dampers have been described, finally developing models to the finite elements and comparing the experimental results with the computerized models. Finally, the Chapter 5 shows the results of the pseudo-dynamic tests carried out on a full-scale steel Moment Resistant Frame equipped in a first case with traditional full strength beam-column connections (dogbone) and in a second case equipped with the innovative connections proposed. These results have been compared to each other and with the results obtained from finite element models. [edited by Author]
XXXI ciclo
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RUSI, Ilda. "Generating Innovative Perforated Patterns for Perimetric Structural Walls with Openings in Multi-Storey Buildings." Doctoral thesis, Università degli studi di Ferrara, 2021. http://hdl.handle.net/11392/2488300.
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Due to the very fast urban development and population growth to the most big cities all over the world, the multi-storey buildings have increased a lot in number. Increasingly, interest is growing in exploring structural systems that allow to build multi-storey buildings. As stated also in the literature and also by Ali. M., M, in his study in 1990, among the major issues that govern the design of a multi-storey building is fulfilling the architectural aspect such as space, function, light while ensuring also the building structural rigidity.Considering also the fact emphasized by Aminmansour & Moon, 2010; Elnimeiri & Gupta, in their study in 2008, that many times, the multi-storey buildings tend to be very inefficient in terms of organisations of the interior spaces. In this regard, based on engineering logical reasoning, in order to provide the sufficient structural rigidity, it requires in many cases, considerable cross section dimensions of structural elements. On the other hands, in engineering design practices there are several cases where to ensure the stability of the building, rigid elements are placed on the building perimeter. The problem is that often, in these cases, these structural elements may interrupt several architectural aspects of the multi-storey building such as its façade, interior space, or even the entire building architectural volume. This study present reinforced concrete Structural Wall elements which are recognized as one of three main structural systems putted on the perimeter of multi-storey buildings among rigid frames and bracing systems. This research aims in suggesting an innovative structural element be implemented in the design process by both being considered as an architectural and structural element.The Structural Wall patterns with different arrangement of openings, called Perforated Structural Wall Panels, are characterized by a pattern of openings in different sizes and forms. This panel should provide the required resistance from the lateral load acting on it while offering at the same time a visual resistance presence. From the architectural point of view, this element offer the possibility to create several configurations of geometric forms, through following a precise methodology explained in further detailed study analysis presented in this study. The methodology can help towards obtaining an optimized panel by creating also a common vocabulary for both the architect and the engineer. This designed vision based on collaboration between architects and engineers aims in fostering an alternative design method outlining an effective structural scheme of multi-storey buildings composed mainly by perforated Structural Wall elements in the building perimeter. Following this design methodology, vertical structural elements would be modified in terms of preserving the required structural members and cutting of the unnecessary ones. The research concludes by discussing on how perforated Structural Wall element can help in fostering the design process and facilitate the decisions steps within designers in concluding the proper building configuration, the architectural performance and the structural rigidity.
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Leaf, Timothy D. "Investigation of the vertical distribution of seismic forces in the static force and equivalent lateral force procedures for seismic design of multistory buildings /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1136093311&sid=1&Fmt=2&clientId=1509&RQT=309&VName=PQD.
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Iwamoto, Roberto Kunihiro. "Alguns aspectos dos efeitos da interação solo-estrutura em edifícios de múltiplos andares com fundação profunda." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-08062006-163117/.
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O objetivo do trabalho é mostrar através de um modelo numérico a importância da consideração da interação estrutura - solo na análise global da estrutura. No modelo de estrutura tridimensional utilizado é considerada a contribuição da rigidez transversal à flexão das lajes, a existência de excentricidades das vigas em relação aos pilares e a hipótese de diafragma rígido no plano horizontal de cada pavimento. Serão consideradas fundações profundas em estacas verticais submetidos à carga de compressão axial ligadas ao bloco suposto rígido, nas quais o efeito de grupo de estacas imersas no solo é calculado considerando a continuidade do solo. A análise da interação do sistema solo estrutura será feito através dos ajustes das rigidezes de fundações pelo processo iterativo até que ocorra uma certa convergência nos recalques ou nas reações. Com isso, procura-se mostrar que a análise integrada da estrutura e o solo possibilita uma melhor estimativa dos recalques diferenciais e reações nos apoios, assim como a redistribuição dos esforços nos elementos estruturais com o comportamento mais real da interdependência dos esforços entre a estrutura e o soloThe main aim of this work is to use a numerical model for soil structure interaction and the importance of their consideration in a global structural analysis. For the structure the model considers the contribution of transverse bending stiffness of slabs, the exccentricy of beams in relation to the pile, and the hypothesis of rigid diaphragms in the plane of the slabs. Primary attention is placed on vertically loaded pile under rigid pile cap in which the influence of pile groups imerse in the soil is calculated considering the soil continuity. The analysis of soil structure interaction is done in an iterative process by adjusting the stiffness of the foundation until a certain preestablished convergence of calculated settlements or load reactions are obtained. In this manner its shown that the integrated analysis of the structure and soil medium leads to better results of differential settlements and load reactions of the supports. In the same manner, this analysis procedure leads to a better estimate of the internal forces in the structural elements, showing a more realistic behaviour of interdependence betwen the strucutre and the soil medium
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Martins, Carlos Humberto. "Contribuição da rigidez transversal à flexão das lajes na distribuição dos esforços em estruturas de edifícios de andares múltiplos, em teoria de segunda ordem." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-30052006-174741/.
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O principal objetivo deste trabalho é calcular esforços e deslocamentos de estruturas tridimensionais de edifícios de andares múltiplos, sujeitos às ações verticais e laterais, considerando a rigidez transversal à flexão das lajes, em teoria de 2ª ordem. O elemento finito de placa adotado na discretização do pavimento, responsável pela consideração da rigidez transversal das lajes na análise do edifício é o DKT (Discrete Kirchhoff Theory). Para os pilares o equilíbrio de forças é verificado na sua posição deformada, ou como é conhecido da literatura técnica, análise em teoria de 2ª ordem, considerando a não linearidade geométrica. Para o cálculo dos esforços e deslocamentos na estrutura são aplicadas as técnicas de subestruturação em série e paralelo na matriz de rigidez global da estrutura. Elaborou-se um programa de computador para o processo de cálculo, utilizando a linguagem computacional Fortran Power Station 90 e pré e pós processadores em Visual Basic 4.0 para ambiente Windows. Finalmente são apresentados alguns exemplos para comprovar a validade do processo de cálculo utilizadoThe main aim of this work is to calculate stresses and displacements of threedimensional structures of multistory buildings, subjected to vertical and lateral loads, considering the transverse bending stiffness of slabs, in second order theory. The plate finite element adopted in floor discretization, responsible for considering the bending stiffness contribution of slabs in the analysis of buildings, is the DKT (Discrete Kirchhoff Theory). For columns the forces equilibrium is verified for the columns in their deformed position, which is known in the technical literature as 2nd order analysis, considering the geometric non-linearity. The techniques of serial and parallel analysis of substructures are applied to the global stiffness matrix for the calculus of forces and displacements in the strucuture. A computer program was developed for the calculation process, using the computer language Fortran Power Station 90 and pre and post-processors in Visual Basic 4.0 for a Windows environment. Finally, some examples are presented to check the validity of the employed calculus process
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Martins, Carlos Humberto. "Análise não-linear de estruturas tridimensionais de edifícios de andares múltiplos com núcleos resistentes, considerando a rigidez transversal à flexão das lajes." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-17052006-154916/.
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O principal objetivo deste trabalho é apresentar um estudo sobre análise de estrutura tridimensional de edifícios de andares múltiplos considerando a interação de deslocamentos e esforços entre os vários elementos que formam a estrutura, levando-se em consideração a rigidez transversal à flexão das lajes. Isto é realizado através de um modelo que compatibiliza o elemento que discretiza o núcleo com sete graus de liberdade, baseado na teoria da flexo-torção de Vlassov, com o restante da estrutura tridimensional de edifícios de andares múltiplos formada pelos núcleos, pilares, vigas e lajes. Os elementos finitos de placa adotados na discretização do pavimento, responsáveis pela consideração da rigidez transversal das lajes na análise do edifício são o DKT (Discrete Kirchhoff Theory) e DST (Discrete Shear Theory). Para os pilares e os núcleos o equilíbrio de forças é verificado na sua posição deformada, ou como é conhecido da literatura técnica, análise em teoria de 2ª ordem, considerando a não linearidade geométrica. Para o cálculo dos esforços e deslocamentos na estrutura são aplicadas as técnicas de subestruturação em série e paralelo na matriz de rigidez global da estrutura. Elaborou-se um programa de computador para o processo de cálculo, utilizando a linguagem computacional Fortran Power Station 90 e pré e pós processadores em Visual Basic 6.0 para ambiente Windows. Finalmente são apresentados alguns exemplos para comprovar a validade do processo de cálculo utilizadoThe main aim of this work is to apresent a study about analysis of three-dimentional structures of multistory buildings considering the interaction of displacements and stresses of the elements of the structures, with the influence of the transverse bending stiffness of slabs. The plate finite elements adopted in floor discretization, responsible for considering the bending stiffness contribution of slabs in the analysis of buildings, are the DKT (Discrete Kirchhoff Theory) and the DST (Discrete Shear Theory). For columns and core walls the forces equilibrium is verified for the columns in their deformed position, which is known in the technical literature as second order analysis, considering the geometric non-linearity. The techniques of serial and parallel analyses of substructures are applied to the global stiffness matrix for the calculus of forces and displacements in the structure. A computer program was developed for the calculation process, using the computer language Fortran Power Station 90 and pre and post-processors in Visual Basic 6.0 for a Windows environment. Finally, some examples are presented to check the validity of the employed calculus process
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Machado, Rafael Tamanini. "Análise da viabilidade econômica do projeto estrutural de edifícios de múltiplos andares com estrutura de aço." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-23102012-095547/.
Full textAbstract:
O presente estudo traz uma revisão bibliográfica dos sistemas estruturais, da estabilidade e análise estrutural de edifícios de múltiplos andares com estrutura de aço e, ainda, do emprego de elementos mistos aço e concreto nesses sistemas, com ênfase às vigas mistas. É aplicável a duas áreas, a saber: acadêmica e prática. Na área acadêmica, contribui com informações que permitem iniciar linhas de pesquisas para diversos assuntos. Na área prática, através de exemplos, contribui com a análise da viabilidade do processo construtivo e estrutural. E por meio de instruções mínimas, contribui para o desenvolvimento de projetos de estruturas metálicas. A referida pesquisa é embasada na ABNT NBR 8800:2008 e, quando indispensável, nas normas ANSI/AISC 360-10 e EN 1994-1-1:2004.The concerned study brings a literature review of structural systems, stability and structural analysis of multistory buildings with steel structures and also the use of steel-concrete composite elements in those systems, with emphasis on composite beams. It applies to two subjects, namely: academic and practical. In academics, it contributes with informations that allows you to start several lines of research. In the practice, through examples, it contributes with the assessment of the viability of the construction and structural process. And using minimal instructions, it contributes to the development of steel structure projects. The related research is based on the ABNT NBR 8800:2008 and, when necessary, on ANSI/AISC 360-10 and EN 1994-1-1:2004.
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KUMAR, NAVIN. "STRUCTURAL RELIABILITY OF A MULTISTORY BUILDING." Thesis, 2018. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16369.
Full textAbstract:
The failure of structural systems in civil engineering is a result of decisions taken from the conditions that are not certain and failures of various natures such as design failures, temporary failures and failures resulting from natural hazards that are needed to be tackled.
The art of formulating a mathematical model over which one can get answer to the questions: “What is the probability that a structure behaves in a specified way when given that one or more of its material properties or geometric dimensions and properties are of a random or incompletely known nature, and/or that the actions on the structure in some respects have random or incompletely known properties?”
Reliability of a structure is an extension to the analysis of a structure that is deterministic in nature which leads to the formulation of a mathematical model by which one get the answer to the question: “How is a structure behaving when its material properties, geometric properties and actions all are uniquely given?”
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Lu, Pei-Pei, and 盧珮珮. "The Research on Architectural Planning of the Multistory Apartment Building in Kaohsiung City." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03833501392620537015.
Full textAbstract:
碩士中原大學
室內設計研究所
98
The industry and commerce had developed suddenly and the population had accumulated since the municipal reformation of Kaohsiung City by 1979; therefore, the density of population has become the highest in Taiwan since 2001. Furthermore, the house prices have risen as the costs risen in Kaohsiung City while the Kaohsiung City government implemented the momentous constructions in succession over recent years and the Kaohsiung Rapid Transit and High Speed Rail have started their regular services one after another. Accordingly, it makes the dwelling construction and momentum in supply in Kaohsiung City to be a noticeable issue.However, the current research concerning about the buildings in Kaohsiung City is focused on the housing market, metropolis plan, housing policy and dwelling environment The most basic research at present for the Architectural Planning of the Multistory Apartment Building in Taiwan took mainly Taipei City as examples. Oppositely, the related literature for the Architectural Planning of the Multistory Apartment Building and district dwelling in supply in Kaohsiung City is quite limited. Therefore, this research is referred the completion of building chart and related information, which aimed at the effective quantifiers for public building is amount to 201 and private condominium is amount to 4919 in Kaohsiung City, administered by the Wine Club, attempted to understand the supply characteristics and the evolution of the Multistory Apartment Building in Kaohsiung City in 40 years recently by‘momentum in supply’from investigable viewpoints about ‘time frame’, ‘site size’, ‘regionalism’ and ‘suppliers’. The effort of this research will be referred to work out the Architectural Planning of the Multistory Apartment Building in cities in Taiwan in future. According to this research for the public building and private condominium in Kaohsiung City over the years, it showed supplied scale of development trend to ‘small scale and more quantifiers’, and included the supply characteristics of few residents, fewer building, lower storey and high coverage ratio at the same time; they were also kept a stable quality of resident over the years and the standards for dwelling has been particularly promoted apparently recently years. In addition to the extension of site size, both of them shows a growth of trend for the amount of residents, floor space of building, building units, storey units and space of each dwelling; however, the coverage ratio and residential density are decreased relatively.
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Huang, Pin-Cheng, and 黃品誠. "Research on Architectural Planning of Large Interior Space Multistory Apartment Building in Taipei City –The Case of Xinyi District –." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11403754990598173222.
Full textAbstract:
碩士中原大學
室內設計研究所
97
During urbanization of urban residence in Taipei, “Multistory Apartment Building (MAB)” becomes popular. Meanwhile the type of hi-end residence has turned from villa to MAB. Developers boost sale appeal to large interior space MAB due to the scantiness of land bases in downtown area. We use cases of MAB whose average floorage is greater than 180 square meters as our research sample. Our viewpoints are focused on time sequence, scale of site area, and interior area in order to present three stages of architectural planning included housing supplement, building plan and dwelling units plan according to the analysis and measurement of approved working drawings provided by Building Administration Office of Taipei City Government. The results of our research show that the rising supply of large interior space MAB started from late 80’s and the characteristics are high ratio of public utility, low coverage ratio, high-story and low residential density. The development of building form tends to centralized. The form of building units, the building structure, and the building form are mainly with elevator hall, square and single individually. As time goes by and the increase of interior area, dwelling units plan is inclined to flexible planning to reduce the waste of second design. Meanwhile, we find that an interior space of 165 square meters is a crucial point for the type of entrance. Entrance hall and two entrances are more popular in which interior space is greater than 165 square meters. Non-common space is moving to enlarge subsidiary space, such as bathroom or locker room. These are important characteristics of architectural planning of MAB.
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SINGH, REKHA. "PUSHOVER ANALYSIS OF MULTISTOREY BUILDING." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14387.
Full textAbstract:
ABSTRACT
In the practical design applications the evaluation of seismic response is usually based
on linear elastic structural behaviour. However this approach may be not sufficient in
limiting the damage levels of the buildings. To this purpose more accurate methods of
analyses, which can predict the real behaviour under strong seismic actions, are
required. The non-linear dynamic analysis is the most rigorous method.
The non-linear static pushover analysis seems to be a more rational method for
estimating the lateral strength and the distribution of inelastic deformations. In this
thesis Pushover analyses were performed by ETABS to predict the behaviour under
strong seismic action and comparing the forces in static linear and nonlinear analysis.
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Behera, Sukumar. "Seismic analysis of multistorey building with floating column." Thesis, 2012. http://ethesis.nitrkl.ac.in/3951/1/Seismic_analysis_of_multistorey_building_with_floating_column.pdf.
Full textAbstract:
In present scenario buildings with floating column is a typical feature in the modern multistory construction in urban India. Such features are highly undesirable in building built in seismically active areas. This study highlights the importance of explicitly recognizing the presence of the floating column in the analysis of building. Alternate measures, involving stiffness balance of the first storey and the storey above, are proposed to reduce the irregularity introduced by the floating columns.
FEM codes are developed for 2D multi storey frames with and without floating column to study the responses of the structure under different earthquake excitation having different frequency content keeping the PGA and time duration factor constant. The time history of floor displacement, inter storey drift, base shear, overturning moment are computed for both the frames with and without floating column.
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Chaku, Autar Kishen. "Seismic behaviour of pile supported multistorey buildings." Thesis, 1989. http://localhost:8080/iit/handle/2074/5858.
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Deshmukh, Pankaj Bhagvatrao. "Rapid Spatial Distribution Seismic Loss Analysis for Multistory Buildings." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9073.
Full textAbstract:
Tall building frames that respond to large seismic ground motions tend to have significant spatial variability of damage over their height, often with a concentration of that damage in the lower stories. In spite of this spatial variability of damage, existing damage and loss models tend to focus on taking the maximum story drift and then assuming the same drift applies over the entire height, damage is then calculated for the building—clearly a conservative approach. A new loss analysis approach is thus recommended that incorporates the effects of spatial distribution of earthquake induced damage to frame buildings. Moreover, the approach aims to discriminate between required repair and replacement damages. Suites of earthquakes and incremental dynamic analysis along with the commercial software SAP2000 are used to establish demands from which story damage and financial losses are computed directly and aggregated for the entire structure. Rigorous and simplified methods are developed that account for spatial distribution of different damage levels arising from individual story drifts.
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Chen, Kun-Yu, and 詹坤玉. "System Identification Theory of Torsionally Coupled Multistorey buildings." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/62575829412126250050.
Full textAbstract:
碩士國立中央大學
土木工程研究所
92
Abstract An knowledge of the dynamic properties of building structural systems is necessary besides for accurate predictions of the dynamic responses of the systems in the seismic design of building structures, health monitoring and damage detection of existing building structures. This study is concerned with the uniqueness of the results in the identification of such properties and feasibility of the identification methods proposed here in actual application using limited earthquake records. More specifically, the viscous damping and stiffness distributions, which are of importance in the linear range of response, have been investigated. During the past four decades, a great amount of system identification methods of building structures based on linear, planar shear building models are developed. In this thesis we propose three new methods of stiffness-damping simultaneous identification of lateral-torsional coupled multistory building models using limited earthquake records. It is shown that if the responses of the floor masses just above and below a specific storey are known, and the locations of moment-resisting elements, the floor masses and the floor moments of inertia are given in N-storey building structures, the storey stiffness and the viscous damping of these elements can be identified uniquely, and that for two-storey building structures if the response of the floor mass immediately above the base and the base are known, and the locations of all moment-resisting elements, all floor masses and all floor inertias are given, the storey stiffness and the viscous damping of all elements can be identified uniquely. The accuracy of the identification methods presented in this thesis is verified and investigated through the actual limited earthquake records and numerical simulation model by means of Newmark’s integration method and the technique of the FFT (Fast Fourier Transform).
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Tanwani, Nanik. "Seismic analysis of multistorey buildings on individual footings." Thesis, 1994. http://localhost:8080/iit/handle/2074/5941.
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MEENA, RAHUL KUMAR. "EFFECTS OF BRACING SYSTEM ON MULTISTORYED STEEL BUILDING." Thesis, 2018. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16202.
Full textAbstract:
In recent years, steel construction has shifted from moment-resisting frames to concentric braced frames in regions of highly seismic prone area. Bracing element in structural system by providing more stiffness plays a vital role in structural behaviour to resist earthquake forces. Concentric bracing is one of the most common lateral load resistant systems in building frames due to their manufacturing simplicity and economy. In this work, different types of bracing (X bracing, Inverted V bracing, K bracing, V bracing, Forward bracing, Backward bracing ) have been analysed and comparison has been made on the basis of maximum lateral displacement at each floor level due to seismic and wind loading. The main parameters considered to compare the seismic performance of buildings were bending moment, shear force, story drift, storey shear and concluded that the braced building of the storey drift decreases as compared to the unbraced building which indicates that the overall response of the building decreases, the displacement of the building decreases depending upon the different bracing system employed and the bracing sizes. In the present study, a 20 storey steel frame structure is analysed. For this purpose, seven different models were generated by changing the bracing system in steel frame and analysed for wind and seismic forces. It may be concluded from this study that bracing element will have very important effect on structural behaviour under seismic loading. Most suitable bracing system is Backward bracing system. Lateral displacement at top floor is reduced approximately 50% for Backward braced in frame structure compared to without bracing system.
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AlvaroCordova and 楊家辰. "Numerical Simulations on the Torsional Behavior of Multistory Concrete Masonry Buildings." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/yx94t6.
Full textAbstract:
碩士國立成功大學
土木工程學系
105
The use of concrete masonry constructions in developing countries has become very frequent, especially for domestic purpose. Most of them with asymmetric wall configurations in plan resulting in significant torsional actions when subjected to seismic loads. The study consisted on the finding of a material model for hollow unreinforced concrete masonry and a validation with experimental data found in literature. Numerical simulations were performed to 20 buildings with variations in wall distributions and heights. Results were analyzed by inspection and with a non-linear static method. The findings revealed that eccentricities as well as structure rigidities have a strong influence on the overall response of concrete masonry buildings. In addition, slab rotations depicted more accurate information about the torsional behavior than maximum versus average displacement ratios. The failure modes in low buildings were characterized by high tensile strains in the first floor. Whereas in tall buildings these strains were lowered significantly by higher compression stresses due to a higher self-weight. These tall buildings developed multiple plastic hinges along the height. Finally, the non-linear static analysis exposed a brittle response for all masonry assemblies. This type of behavior is undesired in any construction and the need for a material model for reinforced masonry is pointed out.
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Chang, Yung-Chao, and 張永照. "Mechanisms of UHF Radio Wave propagation into Multistory Buildings for Microcellular Environment." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/28693259592116896953.
Full textAbstract:
碩士國立交通大學
電信工程研究所
86
Mechanism of UHF radiowave propagation into multistory office buildings is explored by using ray-tracing based models, which include a three-dimensional (3-D) ray-tracing model and a direct-transmitted ray (DTR) model. Prediction accuracy of the models is ascertained by the measured data and the measurements are carried out at many specific sites with different propagation scenario. Their measured results also demonstrate some important propagation phenomena. It is found that (1) the direct transmitted wave may be the dominant mode; (2) the path loss neither increases nor decreases monotonically as a function of increasing floor level; and (3) there is not much difference of the average path loss among the receiving positions in the same room.
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Lee, Wen-Chi, and 李文志. "Analysis of Shoring/Reshoring of Concrete Multistory Buildings And Construction Cost Analysis." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/30358086200013048872.
Full textAbstract:
碩士中原大學
土木工程研究所
97
In the story of construction buildings, duration of the structure construction which is depend on muti-story shoring/reshoring systems and curing temperature. Without considering the difference between the design between live load on the floor and using a non-appropriate shoring systems, the slab may result in cracks during the construction. The problem would not appear during the early stage after the completion of building construction. Because theres an additional waterproof membranes which can be a temporary barrier leakage floor. A few years later, the waterproof membranes has lost its functions. Which caused the poor construction quality issues. In the costs of an investment and development plan in construction, the most direct impact facts is the duration of construction. Taiwan's construction is currently trying to shorten the period of construction planning, Most commonly on the ground floor of the estimation method is shoring of muti-story to shorten construction period. In the construction cost, a shoring used s muti-story is higher than reshoring and non-economic. Therefore, it can not be effective to reduce construction costs and improve investment returns. The muti-story shoring and reshoring can effectively shorten the construction period. In assessing the construction period, the paper analyzes the six-storey complex to muti-story shoring/reshoring, Base on the load changes cased by various stages of each process to expect the time of formwork for the various stages of operation and summarized into six kind of the max floor loading for muti-story shoring/reshoring. It could be provided for a industry refer to the assessment of construction period and shoring to avoid floor support construction of the cracks and collapse.
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Mahammad, Yaar. "Seismic Performance of Multistorey Reinforced Concrete Buildings By Pushover Analysis." Thesis, 2015. http://ethesis.nitrkl.ac.in/7027/1/Seismic_Muhammad_2015.pdf.
Full textAbstract:
The buildings are constructed mostly based on the usual standard codes considering the gravity loads consisting of the self-weight of the structure and the live load. These structures are experiencing low magnitude loads in their design life that leads only to the elastic range response, however, strong loads such as a sudden earthquake will lead the structure beyond its elastic limit. The performance of Reinforced Concrete structures will be nonlinear under seismic loads so the nonlinear behavior of reinforced buildings will be defined by the formation of plastic hinges and loss of considerable stiffness. In this case we need a method to evaluate the performance level of the structure in the plastic range, hence we used pushover analysis to evaluate the response of the structure to the lateral loads For the explanation above the best example can be the devastating earthquake of Nepal (25th April 2015) which has affected many buildings constructed based on traditional design codes. So it’s important to use deformation based design to avoid or at least develop the ductile behavior for structure; this will avoid the collapse of the building and will surely ensure life safety. In present study pushover analysis is carried out on G+4, G+11 and G+21 Building situated in New Delhi (Zone IV) according to IS 1893:2002 classification of seismic zones in India. Pushover analysis was performed in SAP2000 after it was designed for gravity loads in STAAD Pro based on IS-456-2000. The pushover curve, capacity spectrum, demand spectrum and Performance point of the building was found from the results of SAP2000 and hence it was concluded that the building response is highly dependent on the materials used in the design. Mostly the failure was noticed in the columns of ground story of the buildings. After using increased amount of reinforcement in the ground story the buildings have reached life safety performance level
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Rao, K. Rama Mohana. "Seismic analysis of torsionally coupled multistorey buildings on layered soil stratum." Thesis, 1996. http://localhost:8080/iit/handle/2074/5986.
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Mirvalad, Seyed Javad. "Robustness and Retrofit Strategies for Seismically-Designed Multistory Steel Frame Buildings Prone to Progressive Collapse." Thesis, 2013. http://spectrum.library.concordia.ca/977095/1/Mirvalad_MASc_S2013.pdf.
Full textAbstract:
Unlike seismic engineering that attracted the attention of researchers, designers, and code developers for decades, the phenomenon of progressive collapse of structures still needs considerable amount of investigation. The main motivation for this study is to investigate the vulnerability of seismic code designed multistory steel moment resisting frame buildings to progressive collapse, and to propose retrofit solutions for those buildings that show to be prone to progressive collapse.
The studied buildings had 5, 10, and 15 stories (representing low-rise, medium-rise, and high-rise buildings), where each building was designed for three seismic zones (representing low, medium, and high seismicity). All studied buildings have a 3-bays x 6-bays rectangular plan; each bay has a span of 6 meters. Alternate Path Method (APM) recommended by GSA 2003 guidelines is adopted to evaluate the robustness of the buildings against progressive collapse. Three-dimensional models of the buildings are built using the Extreme Loading for Structures (ELS) software, where nonlinear static and nonlinear dynamic time history analysis are conducted for six different column removal scenarios for each building.
The nonlinear dynamic analyses showed that buildings designed for low seismicity do not possess sufficient resistance against column removal cases, thus need to be retrofitted to safeguard against the possibility of their progressive collapse. Consequently, two retrofit methods using top beams grid system and top gravity truss system are proposed for buildings in low seismic zones in order to enhance their robustness against progressive collapse. The nonlinear static and nonlinear dynamic analyses of the retrofitted buildings using the ELS software showed the effectiveness of the proposed retrofit systems in mitigating progressive collapse.
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LUO, MING-FENG, and 羅明峰. "On the seismic resistant analysis of multistory steel buildings with consideration of panel zone effect." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/70220222992209051776.
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Sewell, Cheryl Dale. "Inelastic response of torsionally unbalanced multistorey shearwall buildings designed using elastic static and dynamic analyses." Thesis, 2000. http://hdl.handle.net/2429/10963.
Full textAbstract:
Damage to buildings during recent earthquakes caused by increased torsional response supports
the need to improve upon the existing building code design guidelines through developing a
better understanding of the response of asymmetric buildings with the intent to restrict the
construction of torsionally precarious structures. The effects of torsion on building response is
a complex problem for even single storey structures because so many parameters are involved
in the description of linear and nonlinear torsional response. Discrepancies exist between the
results of many previous studies due to the number of factors governing torsional response.
Researchers also have varying opinions as to how to effectively incorporate torsional effects
into analytical models for building design. These controversies contribute to the fact that there
are wide variations between the torsional provisions of major world design codes. Current
building codes torsional provisions are only applicable to buildings which are essentially
uniform vertically with relatively symmetric floor plans.
Most studies examining torsional response of multistorey buildings focus on shear frame
structures. This study investigates the adequacy of elastic design methods to predict and control
the increased displacement and ductility demand on edge-elements of vertically uniform,
multistorey, shear core buildings, designed to yield in flexure, with varying degrees of
asymmetric stiffness distribution. A comparison is made between the elastic and nonlinear time
history response of models designed using three elastic methods of determining element
strength; the NBCC static torsional provisions (NBC), revised static torsional provisions
proposed by Humar and Kumar (H/K), and a dynamic analysis with a statically applied torsional
moment of 0.1b (Dyn+Tl) where b is the length of the building perpendicular to the direction
of earthquake motion.
The elastic static methods grossly overestimate nonlinear displacements of elements on both the
stiff- and flexible-edges for torsionally flexible structures. The elastic response spectrum
analysis (RSA) with shifted centre of mass (CM) best estimates inelastic displacements for all
elements. Inelastic displacements of stiff- and flexible-edge elements generally increase with
increasing torsional flexibility for structures with a torsional to lateral frequency ratio, Q < 1.
Deformation demand increases with the magnitude of static stiffness eccentricity for the
flexible-edge elements. The inelastic displacements of stiff-edge elements of torsionally stiff
structures (for Q = 1.25) increase for the Dyn+Tl and sometimes for the H/K design method,
leading to large ductility demands for these elements. The NBC design method best controls the
displacements and, therefore, ductility demand of stiff wall elements at Ω = 1.25. The
displacement response of structures with a lateral period > 2 seconds is relatively insensitive to
the design method used for determining element strength distribution. The ductility demand of
the flexible wall elements is below the design target for all methods of design.
Dynamic magnification of base shear and storey shear forces, found by the nonlinear analyses,
due to the contribution from higher modes can be more than double those predicted by elastic
analysis, regardless of the elastic method employed in determining wall strengths. Also, the
inelastic moment demand from the nonlinear dynamic time history analyses varies substantially
from that predicted by the elastic analyses. Higher mode effects are evident in the moment and
shear envelopes of the stiff and flexible walls and are more pronounced for the buildings with a
lateral period > 2 seconds.
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Bhat, Javeed Ahmad. "Impact of torsional ground motoin on the sesmic response of multistorey buildings on compliant foundation." Thesis, 2003. http://localhost:8080/iit/handle/2074/6099.
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Alasgarov, Amir Elxan Oglu. "Seismic Design according to Eurocode 8 and AzDTN 2.3-1: Case study of multistorey building in Baku." Master's thesis, 2021. http://hdl.handle.net/10400.8/6347.
Full textAbstract:
Detailed and entire research in the comparison of seismic behaviour of reinforced concrete structures under European seismic code and Azerbaijan seismic code are not yet provided. However, there are big interests from the Azerbaijan Republic to involve European codes as state construction norms in Azerbaijan. Because of this, comparison has been made to help Azerbaijan move to European Standards.
The following aspects were taken into account in order to make a comparison of seismic codes: design states, structural types, ground conditions, important classes, seismic zones, horizontal elastic response spectrum, base shear force and distribution of the horizontal seismic forces. Chapter 4 compares results of the case study in Chapter 3. To make a seismic analysis, the existing constructed structure was taken into account to apply seismic codes of Europe and Azerbaijan. The Robot Structural Analysis software was used for modelling structure and analysing it behaviour and results.
The several aspects of both seismic codes are quite similar, such as design limit states, seismic zones, but the most similar aspect observed in the research is that of the characteristics of ground types. The almost 80% of difference in base shear force is observed for studied building. Also, studies show that Azerbaijan code is much more conservative in terms of shape of elastic response spectrum in poor soil conditions than European seismic code.
Basically, overall results of research show that Azerbaijan Construction Norms, in terms of seismic design, are much more conservative in all aspects comparing with European codes. The main reason for this is the high seismicity of number of regions of Azerbaijan. Also, to consider is the cost of construction materials in Azerbaijan is way less that the cost in Europe.
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Cavallaro, Giovanni Ferrante. "Pseudo-dynamic tests and numerical analysis of free from damage Multistorey Steel Buildings with innovative connections." Doctoral thesis, 2019. http://hdl.handle.net/10316/95020.
Full textAbstract:
One of the most widespread structural systems is represented by Moment Resisting Frames (MRFs). This structural system is made up of frames capable of resisting seismic actions through predominantly flexural tension states. The stiffness and lateral resistance of the system depend on the flexural strength of the members and the type of connection, while the development of the plastic hinges guarantee the dissipation of the seismic input energy. The location of the dissipative zones varies according to the design approach adopted, typically they develop in beams, columns and connections. The most widespread design philosophy is to have strong columns, weak beams and full-strength rigid connections with complete resistance restoration, in this way all the seismic energy tends to be dissipated by the plastic hinges at the ends of the beams and at the base of the columns of the first level.
In order to overcome the traditional design approach, the present research work introduces a new type of beam-column connection capable of exhibiting a remarkable rigidity in service conditions (SLE) and able to exhibit a remarkable dissipative capacity when a rare seismic event occurs. The codes currently in force provide that for seismic events characterized by a period of return comparable with the useful life of the construction (frequent or occasional events) the structures remain in the elastic field ensuring that the seismic energy is completely dissipated through viscous damping. Vice versa, the seismic energy must be dissipated through plastic engagement of parts of the Pseudo dynamic tests and numerical analysis of free from damage multistorey steel buildings with innovative connections structure, with wide and stable hysteresis cycles, for rare and very rare seismic events with a return period of about 500 years. The development of the hysteresis involves structural damage that have to be such as not to lead to the collapse of the structure in order to guarantee the protection of the life of those who occupy the building. The prediction of the behaviour of the structure in non-linear field for rare seismic events represents an aspect that only experimental research can describe in depth by developing new analytical models and innovative design philosophies. The execution of quasi-static tests can provide useful information in order to investigate the nonlinear behaviour of the members and the assemblages even if the forces or the displacement histories applied during the tests do not correspond exactly to the actions that occur during a real seismic event. The information obtained through these test procedures is however useful for calibrating analytical models and comparing the behaviour of structural components. The execution of tests on real scale structures is the best way to investigate the global behaviour of a structural system. For a more complete knowledge about the response in the dynamic field, the pseudo-dynamic tests represent a test protocol able to provide information of the structural response of a component or of a structure in a dynamic field through a static test.
The main purpose of this work, developed within the FREEDAM research project financed by the European Community, is to develop an innovative beam-column connection. These innovative connections are equipped with an additional damper able to dissipate the energy deriving from destructive seismic events. The FREEDAM beam-column connection, through an appropriate design of the various components, is able to withstand frequent earthquakes and rare events without causing damage to the structural elements.
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Mahesh, M. K. "Effect of foundation compliance and of rotational components of earthquake on seismic response of torsionally coupled multistorey buildings." Thesis, 2000. http://localhost:8080/iit/handle/2074/6107.
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Yao-Wen, Tu, and 涂耀文. "The Research on the Improvement of the Inspection to Fire-Fighting Equipments -Case Study to the Multistory Apartment Buildings in New Taipei City." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/dxxdx6.
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碩士中華科技大學
土木防災與管理碩士班
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Taiwan is a nation with small islands and dense population; hence, tall building has been adopted as the frequent style for house construction. This style hardens the rescue for firefighters with less efficiency during fire caused by the difficult accessibility to the destinations, which highlights the importance of fire safety equipment for less injury and death of human lives. This article attempts to find out the efficiency of different fire safety equipments in case of a fire. In addition, this also provides reference data on fire security checks and decrees as well as regular self-maintenance on fire safety equipment for building management committees; which is for advanced alarm and improvement. The main targets for this research are those ones at 11th to 15th story of housing complex in New Taipei City. Utilizing literature reviews and interviews with experts based on their past experiences, the questionnaire has been designed; And, SPSS software has been applied for analysis while with turnover of the questionnaire. The questionnaire can be distinguished into 3 evaluative indexes, “Equipment (including fire safety equipment and security equipment)”, “Personnel” and “Training (including classes and certificates)”. This balanced development strategy assures the quality of inspection on fire safety equipment for advanced life security on those in habitants in tall buildings. According to interviews, questionnaire turnovers and actual fire cases those equipments with better protection on security of life and property during fire are automatic sprinklers, automatic fire detection systems, and emergency public address equipment. Regarding the “Personnel” term, 84.6% of interviewees confirm the necessity of liability and promotion for those who are responsible for the security inspection in fire departments82.69% confirm the necessity for the regular fire safety equipment inspections by building management committees with records on temporary .status; 84.62% confirm that the central government should take the same actions for the above mentioned. Regarding the “Training” term, 85.58% confirm the necessity of basic training for firefighters before security inspections”; 80.77% confirm the necessity of fire safety equipment training for residents by building management committees. The further proposal on research and analysis should take the higher story, more equipments, and complicated tall buildings into consideration; which can strengthen the credibility of the questionnaires. The results provide both of professional and amateur staffs on inspection, decree, and equipment management for better security.
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Reddy, M. Srinivasa. "A study on the temperature and heat flow behaviour of a room in top floor of a multistorey residential building located in Delhi." Thesis, 1988. http://localhost:8080/iit/handle/2074/5857.
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Секачева, А. А., and A. A. Sekacheva. "Численный анализ длины и формы элемента трубопроводной системы, выполненный с целью прогнозирования и исключения возможности возникновения резонансных режимов : магистерская диссертация." Master's thesis, 2017. http://hdl.handle.net/10995/55412.
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Диссертация посвящена проблеме возникновения шума и вибрации от трубопроводных систем многоэтажных зданий. Предложен способ определения вероятности возникновения повышенных вибраций с помощью модального анализа в программном комплексеANSYS Workbench. Представлены результаты численного анализа влияния длины, диаметра и толщины стенки участка трубопровода на изменение значений частот его собственных колебаний с целью прогноза риска возможных резонансных режимов. Выполнены статистический и регрессионный анализы.The dissertation discusses the occurrence of noise and vibration from the piping systems of multi-storey buildings. A method for determining the probability of excessive vibrations using modal analysis software complex ANSYS Workbench. The results of the digital analysis of influence of length, diameter and thickness of a wall of the pipeline’s section on change of values of frequencies of its natural oscillations are provided. Statistical and regression analyses are made.