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Letteratura scientifica selezionata sul tema "Towers structure"

Autore: Grafiati

Pubblicato: 29 luglio 2024

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Towers structure"

Cai, Ling, Yi Deng e Xing Jiang. "Construction Technology of Centro-Column Drum Towers of Dong Nationality". Advanced Materials Research 450-451 (gennaio 2012): 870–76. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.870.

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Abstract: The building structure of a Dong nationality’s drum tower is divided into two categories, namely, the tai-liang and chuan-dou hybrid structures, and the chuan-dou structure, which are from the major carpentry structure system of traditional Chinese timber structure architecture. Then, the most common “centro-column” type drum tower among the chuan-dou structure drum towers is defined and classified. The structure technology features of “single-column” and “ringed-column” drum towers, which are also those of a “centro-column” drum tower, are discussed in great detail. Through surveying and mapping, structure conversion models, such as those that “increased columns” and “reduced columns” of “ringed-column” drum towers, are studied mainly. In addition, many specific construction details that improve a drum tower’s external image, like multi-eaves, columns that are inclined inwards, as well as the honeycomb Dougong, are also studied in this paper.

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Lingaraju, Mahesh Kumar Chitrahalli, Shwetha Kotagi Girisha, Shanthappa Bhaktanakatte Channabasappa e Manjunatha Karigowda. "A Study on Dynamic Behavior of Natural Draft Cooling Tower Considering the Effect of Soil-Structure Interaction". Civil and Environmental Engineering Reports 31, n. 4 (1 dicembre 2021): 17–32. http://dx.doi.org/10.2478/ceer-2021-0047.

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Abstract In this present era, the technology in advanced construction has developed to a very large extent. Some parts of the constructions are still in the improving stage which includes Cooling tower Construction. Hyperbolic cooling towers are large, thin shell reinforced concrete structures which Contribute to power generation efficiency, reliability, and to environmental protection. Cooling towers use evaporation of water to eject heat from processes such as cooling the circulating water used in oil refineries and in power plants. Nowadays in many thermal power plants, we can see the Cooling tower. So, preserving this industrial structure is an effort to save the cooling tower from dangerous earthquakes. The present-day cooling towers are exceptional structures in view of their sheer size and complexities. Present paper deals with the study of dynamic response that is modal analysis, seismic analysis of the two different cooling towers varying the H/t ratio and thicknesses with fixity at the base boundary condition, and the soil is modelled as raft for the effect of soil-structure interaction using the direct approach. In this paper, hyperbolic cooling towers are modelled using Ansys software, which is a Finite element Software. Results show that the soil-structure interaction effect significantly modifies the earthquake behavior of Hyperbolic Cooling towers.

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Shah, Hemal J., e Atul K. Desai. "Comparison of Seismic Response of Mono and Hybrid Structural System for Tall Windmill Tower considering Near-field and Far-field Earthquake". Disaster Advances 15, n. 8 (25 luglio 2022): 35–45. http://dx.doi.org/10.25303/1508da035045.

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The windmill towers are the tall structures which are used as supporting mechanism for mounting the nacelle and rotor of windmill. These tower structures are conventionally steel structures with monopole configuration. It may be possible that these towers are installed in area of high earthquake risk and they are subjected to natural disaster like earthquake during its life span. The conventional monopole towers are not useful for very tall windmill tower in seismically active regions owing to slender effect. To reduce damages in conventional monopole tower constructed in near filed seismic regions, the new hybrid structural system which is blending of monopole and lattice configuration is proposed in present research. The mass and stiffness of structure are important parameters to resist the seismic forces, therefore in present research, new structural configuration is proposed which gives more stiffness to structure. The 125 mt high conventional monopole windmill tower is modelled in the numerical simulation and appropriate model of hybrid tower is also modelled in FE software. Both monopole and hybrid towers are subjected to natural disaster like earthquake, considering different near field and far filed Seismic excitation. Detailed dynamic analysis of both towers was carried out and response of monopole and hybrid tower was compared for parameters like displacement in time domain, baes shear in time domain and response spectra of structure. From the results obtained using numerical investigation, it is concluded that the innovative hybrid structural system is more effective in tall windmill tower and can be used efficiently to resist the natural disasters like earthquake.

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Dang, Yu, Kai Cheng Huo e Fang Fang Qin. "Lateral-Torsional Coupled Seismic Response of Asymmetric Multi-Tower Base Isolated Structures with Large Floors". Advanced Materials Research 243-249 (maggio 2011): 3975–79. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3975.

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The special type isolated building defined as asymmetric multi-tower base isolated structure with large floor is discussed in this paper. The rigid layers in series models are obtained and the elastic time history method is used to analyze the performance and seismic response of the structure. With the objective of studying the influence of the mass eccentricity in the towers and the asymmetric towers, coefficients of shear force, the ratios of period and the ratios of drift are discussed. The following conclusions have been attained: Torsional drift can be significant depending on the isolated layer in the asymmetric multi-tower with large floor. Comparing with the fixed base structures, this special type isolated building still can be reduced torsional response. The effect of isolation is reduced with the mass eccentricity in the towers and the asymmetric towers increases. It is concluded from the study that the multi-tower base isolated building with large floor should be symmetric and central in order to increase performance of isolation.

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Halabian, Amir M., e M. Hesham El Naggar. "Effect of foundation flexibility on seismic response of reinforced concrete TV-towers". Canadian Journal of Civil Engineering 28, n. 3 (1 giugno 2001): 465–81. http://dx.doi.org/10.1139/l01-014.

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The analysis of tall reinforced concrete TV-towers is commonly simplified by assuming a fixed base and ignoring the effect of soilstructure interaction. However, the foundation flexibility affects the dynamic characteristics of tall structures and influences their dynamic behaviour. To design these towers for dynamic loading, the fundamental natural periods, base bending moment, and base shear force as the most important parameters are needed and must be evaluated properly. In the current study, a finite element formulation for the response analysis of TV-towers subjected to earthquake ground motion accounting for soilstructure interaction is presented. The effects of foundation flexibility on the dynamic behaviour of TV-towers were evaluated for two different types of foundation, shallow footing and deep foundation, and various soil profiles. A typical example for these towers is analysed and the results for a range of soil dynamic parameters are presented. It was found that the foundation flexibility increases the natural periods, alters the natural mode shapes, and decreases the base bending moment. It was also concluded that the effect of soilstructure interaction may have a large effect on the base shear of the tower and should be considered in the analysis, especially for the design of horizontal reinforcement.Key words: soilstructure interaction, TV-towers, natural period, base forces, foundation flexibility.

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Gupta, Hritik, Aditi Chourasia, Dr Chaitanya Mishra e Dr Parikhsit Joshi. "A Review on Use of Telecommunication Tower over Host Structure". International Journal for Research in Applied Science and Engineering Technology 11, n. 10 (31 ottobre 2023): 1213–18. http://dx.doi.org/10.22214/ijraset.2023.56192.

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Abstract: Effective communication depends on strong towers since it has been used worldwide. The telephonic communication depends on this since it is the only way to connect different networks. It can be installed above the structure and over the ground but the failure of such structures during hazardous conditions can result in critical communication breakdowns. In this study different reviews based on the telecommunication towers installed on tall buildings worldwide has given. Usually, four-legged towers used for good communication and to transfer the load. Different reviews based on only tower analysis and remaining on the response over the host structure over which the tower rests. This literature review provides valuable visions and conclusions to identify the problems related to the telecommunication tower which has to be provided over the building and the location over which it has to be placed. From this study it has to be noted that previous studies were based on the location that was optimum for the host structure but no one used the worst case of tower placing if it will be necessary to provide at that location. From this, we came to know the conclusive outcome that aim to provide technical insights and recommendations for future research in this area

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Katare, Shantilal. "A Review on Buildings having Telecommunication Tower at Roof". International Journal for Research in Applied Science and Engineering Technology 12, n. 2 (29 febbraio 2024): 1228–34. http://dx.doi.org/10.22214/ijraset.2024.58576.

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Abstract: Strong towers are relied upon for effective communication, as they have been used worldwide. Telephonic communication is dependent on this, as it is the sole means to connect different networks. They can be installed above structures and on the ground, but critical communication breakdowns can be caused by the failure of such structures during hazardous conditions. In this study, different reviews based on telecommunication towers installed on tall buildings worldwide has given in this paper. Typically, four-legged towers are used for ensuring good communication and for transferring the load. Different reviews are based on tower analysis alone and focus on the response of the host structure on which the tower rests. Valuable insights and conclusions are provided by this literature review to identify the problems associated with the placement of telecommunication towers over buildings and the locations where they need to be placed. From this study, it is to be noted that previous studies were based on the location that was optimal for the host structure, but the worst-case scenario of tower placement was not used till date if it was necessary to provide it at that location. As a result, the conclusive outcome is known to aim at providing technical insights and recommendations for future research in this area

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Pavia, Arianna, Fabrizio Scozzese, Enrica Petrucci e Alessandro Zona. "Seismic Upgrading of a Historical Masonry Bell Tower through an Internal Dissipative Steel Structure". Buildings 11, n. 1 (9 gennaio 2021): 24. http://dx.doi.org/10.3390/buildings11010024.

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Masonry towers are part of a valuable architectural heritage characterizing the landscape of many historical areas. These towers are vulnerable structures that are prone to earthquake damage. Hence, the design of effective seismic upgrading interventions is an important task for preserving such architectural forms for future generations. In view of that, the objective of this study is to contribute a possible addition to the portfolio of available approaches for seismic upgrading of masonry towers. This goal was pursued by exploring an innovative structural solution that does not alter the external appearance of the tower and its static scheme under gravity loads, yet is able to increase its capacity to withstand seismic actions through added damping. Specifically, the proposed solution consists of a steel structure internal to the masonry tower that incorporates fluid viscous dampers. In order to evaluate its potentialities, a real case study was taken as a testbed structure, historic analysis as well as geometric and architectural surveys were undertaken, an initial design for the upgrading was made, and numerical simulations were performed. The obtained results, although preliminary, highlight the potentialities of the proposed structural solution for the seismic upgrading of masonry towers and might open the way to future developments and applications.

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Zheng, Ni Na, Ying Min Li, Jing Zhao e Zheng Lun Chen. "Seismic Design Scope of Tower Structures for UHV Transmission Lines on the Zone of Earthquake Fortification Intensity 8". Advanced Materials Research 446-449 (gennaio 2012): 3730–35. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.3730.

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The seismic action effects of tower structures for ultra-high-voltage(UHV, upon 750KV) overhead transmission lines are much greater than those of 500KV and below, it is necessary to inspect the control load in structural design and specify the seismic design scope of tower structures for these UHV transmission lines. In this paper, the current regulations of seismic design and non-seismic design of tower structures for overhead transmission line were contrasted firstly; then, a series of typical towers including large-crossing towers and cup-towers at soft sites, on the zone of earthquake fortification intensity region of 8, were analyzed. The ratios of seismic action effects and wind load effects for characteristic value were calculated and the control load in structural design of tower structure was investigated. The results show that, although the height and the weigth of tower structures for UHV transmission lines are increasing, the control load in structural design is still the wind load on the zone of earthquake fortification intensity region of 8 and below.

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Più fonti

Tesi sul tema "Towers structure"

Daniell, W. E. "Seismic behaviour of reservoir intake towers". Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262826.

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Milani, Alisson Simonetti. "ANÁLISE DE TORRES DE LT CONSIDERANDO A INTERAÇÃO SOLO-ESTRUTURA". Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/7785.

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The mechanical model usually adopted in the design of transmission lines (TL) latticed steel towers is very simple, using spatial truss and frame elements, and solved by a linear static or non-linear geometric analysis. In the event of rupture of a conductor cable or a shield wire the loading is considered through static equivalent loads , and foundations are usually modeled how undeformable supports. This work evaluated the response of two TL latticed steel towers subjected to the cable rupture, considering the influence of foundation flexibility in the model and type of analysis, i. e., with a dynamic analysis in time domain and a static analysis with the static equivalent loads , usually adopted in design practice. In dynamic analysis, direct explicit numerical integration of the equations of motion in the time domain was adopted, using the central finite differences scheme, and the model included all components of a TL: the towers, the conductor cables, the shield wires, the insulator strings and the foundation elements, in order to evaluate the influence of boundary conditions on the results. Finally, the results of dynamic analysis of towers, in terms of displacements at the top, support reactions and maximum loads in some selected bars are compared with the results of static analysis.
O modelo mecânico usualmente adotado no projeto de torres metálicas treliçadas é bastante simples, utilizando elementos de treliça e/ou pórtico espacial, e resolvido através de uma análise estática e linear ou não linear geométrica. Nas hipóteses de carga de ruptura de um cabo condutor ou um cabo pára-raios o carregamento é considerado através de uma carga estática equivalente , e as fundações geralmente são modeladas com apoios indeslocáveis. Neste trabalho é avaliada a resposta de duas torres metálicas treliçadas de linhas de transmissão (LT) submetidas à hipótese de carga de ruptura de um cabo condutor, considerando a influência da flexibilidade da fundação no modelo e do tipo de análise, isto é, com uma análise dinâmica no domínio do tempo e uma análise estática com as cargas estáticas equivalentes usualmente adotadas na prática de projeto. Na análise dinâmica, o modelo deve contemplar todos os elementos de uma LT, ou seja, as torres, os cabos condutores, os cabos pára-raios e as cadeias de isoladores, a fim de se availar a influência das condições de contorno nos resultados. Por fim, os resultados da análise dinâmica das torres, em termos de deslocamentos no topo e esforços máximos em algumas barras, devem ser comparados com os resultados da análise estática, para que possam ser elaboradas sugestões nos procedimentos de projeto deste tipo de estrutura.

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Gallagher, Timothy. "Towards multi-scale reacting fluid-structure interaction: micro-scale structural modeling". Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53483.

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The fluid-structure interaction of reacting materials requires computational models capable of resolving the wide range of scales present in both the condensed phase energetic materials and the turbulent reacting gas phase. This effort is focused on the development of a micro-scale structural model designed to simulate heterogeneous energetic materials used for solid propellants and explosives. These two applications require a model that can track moving surfaces as the material burns, handle spontaneous formation of discontinuities such as cracks, model viscoelastic and viscoplastic materials, include finite-rate kinetics, and resolve both micro-scale features and macro-scale trends. Although a large set of computational models is applied to energetic materials, none meet all of these criteria. The Micro-Scale Dynamical Model serves as the basis for this work. The model is extended to add the capabilities required for energetic materials. Heterogeneous solid propellant burning simulations match experimental burn rate data and descriptions of material surface. Simulations of realistic heterogeneous plastic-bound explosives undergoing impact predict the formation of regions of localized heating called hotspots which may lead to detonation in the material. The location and intensity of these hotspots is found to vary with the material properties of the energetic crystal and binder and with the impact velocity. A statistical model of the hotspot peak temperatures for two frequently used energetic crystals indicates a linear relationship between the hotspot intensity and the impact velocity. This statistical model may be used to generate hotspot fields in macro-scale simulations incapable of resolving the micro-scale heating that occurs in heterogeneous explosives.

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Ruziboev, Marks. "Gibbs-Markov-Young Structures and Decay of Correlations". Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4845.

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In this work we study mixing properties of discrete dynamical systems and related to them geometric structure. In the first chapter we show that the direct product of maps with Young towers admits a Young tower whose return times decay at a rate which is bounded above by the slowest of the rates of decay of the return times of the component maps. An application of this result, together with other results in the literature, yields various statistical properties for the direct product of various classes of systems, including Lorenz-like maps, multimodal maps, piecewise $C^2$ interval maps with critical points and singularities, H\'enon maps and partially hyperbolic systems. The second chapter is dedicated to the problem of decay of correlations for continuous observables. First we show that if the underlying system admits Young tower then the rate of decay of correlations for continuous observables can be estimated in terms of modulus of continuity and the decay rate of tail of Young tower. In the rest of the second chapter we study the relations between the rates of decay of correlations for smooth observables and continuous observables. We show that if the rates of decay of correlations is known for $C^r,$ observables ($r\ge 1$) then it is possible to obtain decay of correlations for continuous observables in terms of modulus of continuity.

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Irakarama, Modeste. "Towards Reducing Structural Interpretation Uncertainties Using Seismic Data". Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0060.

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Les modèles géologiques sont couramment utilisés pour estimer les ressources souterraines, pour faire des simulations numériques, et pour évaluer les risques naturels ; il est donc important que les modèles géologiques représentent la géométrie des objets géologiques de façon précise. La première étape pour construire un modèle géologique consiste souvent à interpréter des surfaces structurales, telles que les failles et horizons, à partir d'une image sismique ; les objets géologiques identifiés sont ensuite utilisés pour construire le modèle géologique par des méthodes d'interpolation. Les modèles géologiques construits de cette façon héritent donc les incertitudes d'interprétation car une image sismique peut souvent supporter plusieurs interprétations structurales. Dans ce manuscrit, j'étudie le problème de réduire les incertitudes d'interprétation à l'aide des données sismiques. Particulièrement, j'étudie le problème de déterminer, à l'aide des données sismiques, quels modèles sont plus probables que d'autres dans un ensemble des modèles géologiques cohérents. Ce problème sera connu par la suite comme "le problème d'évaluation des modèles géologiques par données sismiques". J'introduis et formalise ce problème. Je propose de le résoudre par génération des données sismiques synthétiques pour chaque interprétation structurale dans un premier temps, ensuite d'utiliser ces données synthétiques pour calculer la fonction-objectif pour chaque interprétation ; cela permet de classer les différentes interprétations structurales. La difficulté majeure d'évaluer les modèles structuraux à l'aide des données sismiques consiste à proposer des fonctions-objectifs adéquates. Je propose un ensemble de conditions qui doivent être satisfaites par la fonction-objectif pour une évaluation réussie des modèles structuraux à l'aide des données sismiques. Ces conditions imposées à la fonction-objectif peuvent, en principe, être satisfaites en utilisant les données sismiques de surface (« surface seismic data »). Cependant, en pratique il reste tout de même difficile de proposer et de calculer des fonctions-objectifs qui satisfassent ces conditions. Je termine le manuscrit en illustrant les difficultés rencontrées en pratique lorsque nous cherchons à évaluer les interprétations structurales à l'aide des données sismiques de surface. Je propose une fonction-objectif générale faite de deux composants principaux : (1) un opérateur de résidus qui calcule les résidus des données, et (2) un opérateur de projection qui projette les résidus de données depuis l'espace de données vers l'espace physique (le sous-sol). Cette fonction-objectif est donc localisée dans l'espace car elle génère des valeurs en fonction de l'espace. Cependant, je ne suis toujours pas en mesure de proposer une implémentation pratique de cette fonction-objectif qui satisfasse les conditions imposées pour une évaluation réussie des interprétations structurales ; cela reste un sujet de recherche
Subsurface structural models are routinely used for resource estimation, numerical simulations, and risk management; it is therefore important that subsurface models represent the geometry of geological objects accurately. The first step in building a subsurface model is usually to interpret structural features, such as faults and horizons, from a seismic image; the identified structural features are then used to build a subsurface model using interpolation methods. Subsurface models built this way therefore inherit interpretation uncertainties since a single seismic image often supports multiple structural interpretations. In this manuscript, I study the problem of reducing interpretation uncertainties using seismic data. In particular, I study the problem of using seismic data to determine which structural models are more likely than others in an ensemble of geologically plausible structural models. I refer to this problem as "appraising structural models using seismic data". I introduce and formalize the problem of appraising structural interpretations using seismic data. I propose to solve the problem by generating synthetic data for each structural interpretation and then to compute misfit values for each interpretation; this allows us to rank the different structural interpretations. The main challenge of appraising structural models using seismic data is to propose appropriate data misfit functions. I derive a set of conditions that have to be satisfied by the data misfit function for a successful appraisal of structural models. I argue that since it is not possible to satisfy these conditions using vertical seismic profile (VSP) data, it is not possible to appraise structural interpretations using VSP data in the most general case. The conditions imposed on the data misfit function can in principle be satisfied for surface seismic data. In practice, however, it remains a challenge to propose and compute data misfit functions that satisfy those conditions. I conclude the manuscript by highlighting practical issues of appraising structural interpretations using surface seismic data. I propose a general data misfit function that is made of two main components: (1) a residual operator that computes data residuals, and (2) a projection operator that projects the data residuals from the data-space into the image-domain. This misfit function is therefore localized in space, as it outputs data misfit values in the image-domain. However, I am still unable to propose a practical implementation of this misfit function that satisfies the conditions imposed for a successful appraisal of structural interpretations; this is a subject for further research

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Sunny, Mohammed Rabius. "Towards Structural Health Monitoring of Gossamer Structures Using Conductive Polymer Nanocomposite Sensors". Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28797.

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The aim of this research is to calibrate conductive polymer nanocomposite materials for large strain sensing and develop a structural health monitoring algorithm for gossamer structures by using nanocomposites as strain sensors. Any health monitoring system works on the principle of sensing the response (strain, acceleration etc.) of the structure to an external excitation and analyzing the response to find out the location and the extent of the damage in the structure. A sensor network, a mathematical model of the structure, and a damage detection algorithm are necessary components of a structural health monitoring system. In normal operating conditions, a gossamer structure can experience normal strain as high as 50%. But presently available sensors can measure strain up to 10% only, as traditional strain sensor materials do not show low elastic modulus and high electrical conductivity simultaneously. Conductive polymer nanocomposite which can be stretched like rubber (up to 200%) and has high electrical conductivity (sheet resistance 100 Ohm/sq.) can be a possible large strain sensor material. But these materials show hysteresis and relaxation in the variation of electrical properties with mechanical strain. It makes the calibration of these materials difficult. We have carried out experiments on conductive polymer nanocomposite sensors to study the variation of electrical resistance with time dependent strain. Two mathematical models, based on the modified fractional calculus and the Preisach approaches, have been developed to model the variation of electrical resistance with strain in a conductive polymer. After that, a compensator based on a modified Preisach model has been developed. The compensator removes the effect of hysteresis and relaxation from the output (electrical resistance) obtained from the conductive polymer nanocomposite sensor. This helps in calibrating the material for its use in large strain sensing. Efficiency of both the mathematical models and the compensator has been shown by comparison of their results with the experimental data. A prestressed square membrane has been considered as an example structure for structural health monitoring. Finite element analysis using ABAQUS has been carried out to determine the response of the membrane to an uniform transverse dynamic pressure for different damage conditions. A neuro-fuzzy system has been designed to solve the inverse problem of detecting damages in the structure from the strain history sensed at different points of the structure by a sensor that may have a significant hysteresis. Damage feature index vector determined by wavelet analysis of the strain history at different points of the structure are taken by the neuro-fuzzy system as input. The neuro-fuzzy system detects the location and extent of the damage from the damage feature index vector by using some fuzzy rules. Rules associated with the fuzzy system are determined by a neural network training algorithm using a training dataset, containing a set of known input and output (damage feature index vectors, location and extent of damage for different damage conditions). This model is validated by using the sets of input-output other than those which were used to train the neural network.
Ph. D.

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Irakarama, Modeste. "Towards Reducing Structural Interpretation Uncertainties Using Seismic Data". Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0060/document.

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Kawaguchi, Tomoya. "Development of x-ray spectroscopy coupling with resonant scattering -toward applications of practical materials-". 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199305.

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Alhajali, Abdallah. "Analysis of existing offshore structures considering structural damage to investigate a vertical axis wind tower". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The most common offshore structures are the Jackets which are tools used to extract the oil and natural gas in relative low water depth particularly exist in Adriatic Sea and a lot of them have been constructed in the last 50 years. When the offshore oil and gas resources exhaust, these structures must be replaced to another region containing underground resources or removed if reaching the design life, furthermore, another solution can be considered: changing life of the future working of these platforms by applying renewable energy and alternating them into offshore wind towers. This thesis proposes to study and examine the stiffness matrix of an existing Jacket which consider damaged components for reliability analysis of offshore installations. In this research it was used the 8-step simplified methodology which includes several step to analyze the ability of the offshore jacket structure to examine if it is tolerable to endure the effect of wind or wave loads (environmental forces) more than usual by simulating a minimizing of the stiffness matrix using several random cases which they are ten cases, firstly minimizing in the x direction ( 5 cases) and lastly in y direction and then comparing each of these cases with the original case .It was presented two of the most critical cases to show the effect of each step one in x direction and the other in y direction consequently. At the end it is showed that even the structure jacket is 50 years old it is standable and bearable to face some reduction of its stiffness

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Shi, Yongjiu. "Dynamic behaviour of guyed tower platforms". Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/958.

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Più fonti

Libri sul tema "Towers structure"

Amacher, Ryan C. Faulty towers: Tenure and the structure of higher education. Oakland, Calif: Independent Institute, 2004.

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Kutyłowski, Ryszard. Diagnostyka stanu technicznego konstrukcji chłodni kominowych: Diagnostics of cooling tower structure condition. Wrocław: Oficyna Wydawnicza Politechniki Wrocławskiej, 2013.

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Arts Commission of San Francisco., a cura di. Historic structure report: Coit Tower, San Francisco, California. San Francisco: The Commission, 1989.

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IEEE Power Engineering Society. Transmission and Distribution Committee., a cura di. IEEE trial-use guide for transmission structure foundation design. New York, NY: Institute of Electrical and Electronics Engineers, 1985.

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Delcroix, Henri. La tour de Montbran: L'ordre du temple. Les templiers en Bretagne. Pléboulle. Montbran. La Caillibotière. La chapelle Notre-Dame-du-Temple. La foire de Montbran. Sainte-Clotilde de la Réunion: Orphie, 2005.

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Zobel, Rein. Walls and towers of Tallinn. Tallinn: Estonian Encyclopaedia, 1996.

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Trapp, John L. Bird kills at towers and other human-made structures: An annotated partial bibliography (1960-1998). Shepherdstown, W. Va: National Conservation Training Center, 1998.

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Caldelli, Valerie. The leaning tower: The restoration of the century. Pisa: Pacini, 2005.

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Caldelli, Valeria. La Torre pendente: Il restauro del secolo. Ospedaletto (Pisa): Pacini, 2005.

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Kenneth, Powell, e Sir Norman Foster and Partners, a cura di. Telecommunications Tower, Barcelona, architects Sir Norman Foster and Partners. London: Wordsearch, 1992.

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Capitoli di libri sul tema "Towers structure"

Kinne, Marko, Ronald Schneider e Sebastian Thöns. "Reconstructing Stress Resultants in Wind Turbine Towers Based on Strain Measurements". In Lecture Notes in Mechanical Engineering, 224–35. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_18.

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AbstractSupport structures of offshore wind turbines are subject to cyclic stresses generated by different time-variant random loadings such as wind, waves, and currents in combination with the excitation by the rotor. In the design phase, the cyclic demand on wind turbine support structure is calculated and forecasted with semi or fully probabilistic engineering models. In some cases, additional cyclic stresses may be induced by construction deviations, unbalanced rotor masses and structural dynamic phenomena such as, for example, the Sommerfeld effect. Both, the significant uncertainties in the design and a validation of absence of unforeseen adverse dynamic phenomena necessitate the employment of measurement systems on the support structures. The quality of the measurements of the cyclic demand on the support structures depends on (a) the precision of the measurement system consisting of sensors, amplifier and data normalization and (b) algorithms for analyzing and converting data to structural health information. This paper presents the probabilistic modelling and analysis of uncertainties in strain measurements performed for the purposes of reconstructing stress resultants in wind turbine towers. It is shown how the uncertainties in the strain measurements affect the uncertainty in the individual components of the reconstructed forces and moments. The analysis identifies the components of the vector of stress resultants that can be reconstructed with sufficient precision.

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Kita, Nanao. "Structure of Towers and a New Proof of the Tight Cut Lemma". In Combinatorial Optimization and Applications, 225–39. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-71150-8_20.

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Muzofa Tinotendaishe, D., P. A. G. Van Zijl Gideon e W. Day Peter. "Computational Modeling of Soil-Structure Interaction Towards Reduced Concrete Foundation Volume for Tall Wind Turbine Towers". In High Tech Concrete: Where Technology and Engineering Meet, 1380–88. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_159.

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Chujutalli, John H., e Segen F. Estefen. "Preliminary Study of the SHCC Sandwich Structure Application for Offshore Wind Turbine Towers". In Proceedings of the IV Iberoamerican Congress of Naval Engineering and 27th Pan-American Congress of Naval Engineering, Maritime Transportation and Port Engineering (COPINAVAL), 395–408. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-49799-5_57.

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Jamil, Taimur. "Crown Castle Towers LLC, Senior Secured Tower Revenue Notes, Series 2005-1". In Introduction to Structured Finance, 321–34. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119197249.app5.

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Dean, B. K., e J. D. Bennett. "Roof top communication towers". In Tubular Structures VI, 41–44. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203735015-7.

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Cots, Francesc, J. David Tàbara, Jérémie Fosse e Gerard Codina. "Exploring the Role of Identities and Perceptions of the Future in a Post-coal Mining Region: The Demolition of Andorra Coal-fired Cooling Towers (Spain) as a Tipping Point". In Springer Climate, 193–209. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-50762-5_10.

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AbstractIn May 2022, the last cooling tower of the coal-fired power plant in the Spanish region of Andorra in Teruel province was demolished. After forty years in operation such an event had a huge emotional effect on the local population, since much of the local identity and tradition was built around this industrial emblem. On the one hand, it represented a final symbolic farewell to a way of life around coal, now perceived to have inevitably ceased to exist. On the other hand, it highlighted the need to accelerate the full regional transformation towards a new socio-economic structure whose agents of change, content and new identities were not yet well-defined. Our research explores the role of identities and perceptions of the future as key constraining or enabling factors in tipping former carbon-intensive regions towards clean energy and sustainable development pathways. Understanding how local populations see their uncertainties about the future, and examining other views on relative deprivation and inequality, are central in developing enabling governance arrangements and continuous learning feedback loops required in rapid socio-energy transformations. We found out that embracing transformative change towards green transformations may entail adopting more diversified, self-defined complex forms of collective sense-making processes based on project identities.

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Sangiuliano, L., C. Claeys, E. Deckers, J. De Smet, B. Pluymers e W. Desmet. "Locally Resonant Metamaterial Patches on Rear Shock Towers of a Vehicle to Reduce Structure‑Borne Road Noise: Numerical and Experimental Performance Validation". In Proceedings, 122–36. Wiesbaden: Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-27669-0_10.

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Holmes, John D., e Seifu A. Bekele. "Towers, chimneys and masts". In Wind Loading of Structures, 355–81. Fourth edition. | Boca Raton : CRC Press, 2021. |: CRC Press, 2020. http://dx.doi.org/10.1201/9780429296123-11.

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Melnyk, Virginia Ellyn. "Customized Knit Membrane Deployable Hyperboloid Tower". In Computational Design and Robotic Fabrication, 433–42. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8405-3_36.

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AbstractDeployable structures have become increasingly popular due to their ability to transform from a compact form into a larger structure. They are also typically lightweight, resulting in a lower carbon footprint than heavy permanent building methods. These structures are popular within the field of architecture, as well as in robotics, aerospace engineering, and other fields.This paper explores the design and development of a deployable hyperboloid structure with a connected knitted membrane. The knitted material is specifically designed to stretch and fit the transforming geometry of the hyperboloid. This is achieved by manipulating the types of yarn used across the membrane, as well as the number of short rows in the knit material, to create a more specified material. The design for this material was developed using Rhino3d and Grasshopper. Throughout the design and fabrication process, there was a feedback loop between the digital design models and physical material test samples to ensure that the knit would fit the final hyperboloid structure. The result is a two-meter-tall structure when upright and a two-meter-diameter circle when collapsed, with a knit membrane that supports the structure and transforms seamlessly by stretching and shrinking to the different shapes of transformation.

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Atti di convegni sul tema "Towers structure"

Salazar, Juan E., e Jesus A. Mendoza. "Life Prediction of Electrical Power Transmission Towers". In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59490.

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This paper presents a study conducted to estimate the remaining theoretical life of one type of 400 kV latticed steel towers installed on a power transmission line in Venezuela. The study focused on determining the structural behavior and vibration characteristics of suspension towers on the fore mentioned line, considering material loss of their structural members due to atmospheric corrosion, in different design conditions. For this purpose, a commercially available FEM code was used to build models to perform structural and modal analysis of the chosen type of tower, in order to determine load effects in the structure (stress and deformation), natural frequencies and mode shapes in each of the different design states. Then, a simple methodology engineered as part of this study leads to prediction of the tower’s service life based on an allowable state of stress and deformation in the tower (direct and vibration-induced) affected by different reliability factors and taking into account corrosion effects and corrosion rates in a particular environment along the transmission line.

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Pan, Jianhua, Xuedong Chen, Zhibin Ai e Huifeng Jiang. "Local Structure Response of High-Rise Empty Cylindrical Shell Towers to Wind-Induced Resonance Vibration". In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25382.

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High-rise towers are very sensitive to wind loads because of their high flexibility. Wind-induced resonance vibrations due to Karman vortex street have great impact on these structures, especially for the high empty cylindrical shell towers. In a petrochemical enterprise, a few local cracks were detected in some empty towers and the wind-induced resonance vibrations were considered to be responsible for that. In this paper, by employing software SW6 and ANSYS, the tower cracking cause was analyzed with emphasis on the simulation of local structure response for an empty tower under wind loads. It can be found that the stress level was quite severe at the head-skirt conjunctions which were consistent with those actual cracking positions.

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Moe, G., e J. M. Niedzwecki. "Flow-induced vibrations of offshore flare towers and flare booms". In FLUID STRUCTURE INTERACTION 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/fsi090091.

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Wang, Hui, Ruili Shen e Xiang Cheng. "Analysis of Reasonable Longitudinal Restraint System of Four-Tower Cable-Stayed Bridge". In IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/nanjing.2022.0329.

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The four-tower cable-stayed bridge with four towers and three main spans can be set up with various symmetrical and asymmetrical longitudinal restraint schemes for the whole bridge. Different longitudinal restraint systems will directly affect the load transfer path and change the mechanical behavior of the four-tower cable-stayed bridge structure, which in turn affects the structural design of the bridge. Taking a four-tower cable-stayed bridge as the research object, the structural mechanical behaviors of semi-floating system, temperature adaptive system, middle two- tower elastic cable restraint system, and middle single-tower longitudinal fixed restraint system under the effect of temperature load, longitudinal wind load, and load combination are compared and analyzed. The results show that the semi-floating system will cause a larger longitudinal displacement of the main beam, which will increase the internal force of the side towers substantially. Increasing the restraint of the main beam and the middle towers can make the four towers' forces uniform.The temperature adaptive system and the middle two towers elastic cable system have better feasibility.

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Forsberg, Torben, Nils Behrndt Ebbesen e Jesper Henriksen. "Re-use of wind turbine steel towers for pedestrian bridges". In IABSE Symposium, Manchester 2024: Construction’s Role for a World in Emergency. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2024. http://dx.doi.org/10.2749/manchester.2024.1285.

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Steel towers used for wind turbines are being decommissioned after relatively short service lives of around 25 years. This abbreviated lifespan is partially due to fatigue loading, although the steel itself may still be safe for normal loads. FORSBERGS and Dissing+Weitling Architecture are investigating the potential for reusing these towers as the primary structure for pedestrian bridges. The focus of these investigations lies in the structural design of a new bridge, constrained by the existing geometry of the steel tower. One approach involves longitudinally splitting a tower into two half- pipe structures that could serve as bridge spans. This study encompasses an assessment of the CO2 aspect, comparing the overall carbon footprint resulting from a conventional decommissioning of a steel tower with that of repurposing it for a bridge. The proposed concept could potentially apply to narrow pedestrian or bicycle bridges, or utilise side-by-side half-pipes for multipurpose use.

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Bjo̸rset, Arve, Bernt J. Leira e Ragnar T. Igland. "Comparison of Simulated and Measured Wind Forces on Offshore Tower Structure". In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37474.

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For flare towers or other types of slender structures mounted on offshore platforms, evaluation of the forces caused by static and dynamic wind action is of key importance for proper design. The drag coefficient is one of the main parameters to be specified for calculation of these forces. However, for complex lattice towers the drag coefficient is in general difficult to assess. The present paper outlines a procedure for estimation of wind forces and drag coefficients based on numerical simulation of the flow and pressure field around such structures. An example tower is considered for which measurements from wind tunnel tests also are available. The actual tower consists of four columns connected by transverse braces. The computer analysis is performed by the use of the computer code Navsim, which is developed for two-dimensional CFD-analysis.

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Yang, Sheng, Xin Zhao e Yuzhou Hou. "Sensitivity analysis of controlling indices and structural optimization for reinforced concrete shearwall residential towers". In IABSE Symposium, Manchester 2024: Construction’s Role for a World in Emergency. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2024. http://dx.doi.org/10.2749/manchester.2024.1118.

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Reinforced concrete shearwall structure has been widely used in high-rise and super high-rise residential towers because of its high stiffness, high damping, low cost and good adaptability of component layout. Shearwall structure assembly are composed of shearwall limbs and coupling beam component. The shearwall is generally arranged along the vertical height, the lower part extends into the basement, and finally supports on the foundation. In addition, due to the needs of the entrance hall at the bottom of the residential tower or commercial functions, some shearwall assembly are often converted into frame structures at the bottom of the building, which is called frame-supported shearwall assembly. The structural system composed of full-height shearwall is called full-height shearwall structure, and the structural system composed of partial full-height shearwall and partial frame-supported shearwall is called partial frame-supported shearwall structure. The shearwall structure component need to consider both vertical gravity and lateral load to design the strength, stiffness and comfort of the structure. This paper studies the design of shearwall component of residential towers with a height of 100-200 meters, and adopts sensitivity analysis method to analyze the control indexes of components with different heights and positions. It is found that the design of low-zone components is usually controlled by the requirements of seismic ductility, while that of middle-zone components is usually controlled by the requirements of stiffness under earthquake or wind loads. High-zone components are usually controlled by structural requirements. On the basis of sensitivity analysis, this paper further discusses the design optimization method and flow of shearwall assembly. Finally, the sensitivity analysis and optimization design methods are discussed based on a real case of residential tower. The case analysis and optimization results verify the effectiveness of the relevant analysis and design methods.

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Clauss, Gu¨nther F., e June Young Lee. "Dynamic Behaviour of Compliant Towers in Deep Sea". In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37173.

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For oil and gas production in deep water (> 500m) compliant structures are designed. By dedicated reduction of stiffness and optimization of mass (including added mass contributions) the fundamental period is tuned to about 30s, which is well above the period range of significant wave energy. This paper presents the results of a comprehensive numerical analysis of the hydroelastic behaviour of compliant towers in deep water, investigating the dynamic response of a flexible structure in a given sea state. The numerical program system is based on ADINA with an integrated hydrodynamic module for wave/structure interaction. Nonlinear effects of viscous forces are considered using Morison’s vector equation. In addition nonlinear characteristics of soil/structure interaction are also included according to API regulations. At first, for verification of the program system, the numerical results of a monotower are compared to analytical solutions obtained by modal analysis of the structure in regular and irregular seas. Based on the validated program a compliant tower installed in 503 m water in the Gulf of Mexico (Baldpate tower) is modeled in 3D, and the characteristic dynamic behavior is evaluated. Finally, the tower is exposed to a real “freak” wave (the 25.6m high New Year Wave which has been registered at the North Sea Draupner platform on January 1, 1995), and the associated loads and motions are evaluated.

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Jonsson, Magnus Thor, e Ketill H. Gudmundsson. "Weight Optimization of Transmission Towers". In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dac-3991.

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Abstract This paper presents a new approach to the minimum weight optimization of transmission towers, which consists of formulating the optimization problem in a net weight objective function with no constraints. Genetic algorithms are employed to perform the optimization. Instead of using the well known penalty function method to account for design constraints, the constraints are integrated in to the objective function. By selecting cross-sections inside the objective function ensures that the structure, being optimized, is always in full compliance with standard codes of practice for strength assessment of transmission towers. The paper is primarily concerned with practical aspects of transmission tower design and the method is presented with examples based on accepted codes of practice and realistic tower designs. The problem is formulated for a full size transmission tower, where selected portions of tower topology and geometry are optimized, including a cross-sectional optimization from a set of commercially available steel sections.

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Li, Chenglin, Yanxiang Liu, Xinwei Ma e Yuancheng Guo. "Influences of Tube Assembly of Wind Turbine Towers with the Steel-Concrete Composite Structure on Towers". In 2018 3rd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/amcce-18.2018.102.

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Rapporti di organizzazioni sul tema "Towers structure"

Prassad, Kuldeep, e Howard Baum. Fire structure interface and thermal response of World Trade Center towers. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.ncstar.1-5g.

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Vidot, Aidcer L., Luis E. Suarez, Enrique E. Matheu e Michael K. Sharp. Seismic Analysis of Intake Towers Considering Multiple-Support Excitation and Soil-Structure Interaction Effects. Fort Belvoir, VA: Defense Technical Information Center, settembre 2004. http://dx.doi.org/10.21236/ada427787.

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Wang, J. Progress Toward NLC/GLC Prototype Accelerator Structures. Office of Scientific and Technical Information (OSTI), settembre 2004. http://dx.doi.org/10.2172/833049.

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Rákos, András Dominik. Poland and the European Green Deal: On Track Towards Peaceful Coexistence? Külügyi és Külgazdasági Intézet, 2022. http://dx.doi.org/10.47683/kkielemzesek.ke-2022.64.

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Following the adoption of the European Green Deal, the traditionally reluctant position of the government of Poland regarding climate neutrality is showing ruptures and has become controversial. The aim of this policy brief is to assess the structural and discursive elements shaping the climate and energy policy of the Polish government. The paper uses a mixed methodology of literature review and qualitative content analysis involving official statements issued by three government bodies between 1 September and 31 December, 2021. The study finds that the reluctance of the Polish government is maintained by frames that presume an incompatibility between ambitious climate action and the will of ‘the people’, as well as structures that can be characterised by a state capture of the energy sector and the dominance of pro-coal actors.

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Jennings, Chad. Conceptual Design Gamma-Ray Large Area Space Telescope (GLAST) Tower Structure. Office of Scientific and Technical Information (OSTI), luglio 2002. http://dx.doi.org/10.2172/799123.

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Luebke, A. Conceptual Design Gamma-Ray Large Area Space Telescope (GLAST) Tower Structure. Office of Scientific and Technical Information (OSTI), giugno 2018. http://dx.doi.org/10.2172/1454162.

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Du, Xinlong, e Jerome F. Hajjar. Structural Performance Assessment of Electrical Transmission Networks for Hurricane Resilience Enhancement. Northeastern University, agosto 2022. http://dx.doi.org/10.17760/d20460693.

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Hurricanes are one of the main causes for blackouts and related infrastructure damage in the United States. Electrical transmission towers, which are key parts of the electrical transmission networks, are vulnerable to high wind speeds during storms. Collapse of transmission towers may lead to a loss of functionality of transmission lines. This research focuses on regional analysis of electrical transmission networks under hurricane hazards through developing beam elements for analyzing transmission towers, selection of hurricane wind records that incorporate uncertainty quantification, generating collapse fragility curves for transmission towers, and regional damage assessment of transmission networks.

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McDougall, Cynthia, Lone Badstue, Annet Mulema, Gundula Fischer, Dina Najjar, Rhiannon Pyburn, Marlène Elias, Deepa Joshi e Andrea Vos. Toward structural change: Gender transformative approaches. Washington, DC: International Food Policy Research Institute, 2021. http://dx.doi.org/10.2499/9780896293915_10.

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Koubek, Richard J., e Daniel N. Mountjoy. Toward a Model of Knowledge Structure and a Comparative Analysis of Knowledge Structure Measurement Techniques. Fort Belvoir, VA: Defense Technical Information Center, settembre 1991. http://dx.doi.org/10.21236/ada241400.

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Leiras, Marcelo, Martín Ardanaz e Mariano Tommasi. The Politics of Federalism in Argentina: Implications for Governance and Accountability. Inter-American Development Bank, giugno 2012. http://dx.doi.org/10.18235/0011389.

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This paper contributes to an agenda that views the effects of policies and institutional reforms as dependent on the structure of political incentives for national and subnational political actors. The paper studies political incentive structures at the subnational level and the mechanisms whereby they affect national-level politics and policymaking at the national level in Argentina, a highly decentralized middle-income democracy, Argentina. The Argentine political system makes subnational political power structures very influential in national politics. Moreover, most Argentine provinces are local bastions of power dominated by entrenched elites, characterized by scarce political competition, weak division of powers, and clientelistic political linkages. Political dominance in the provinces and political importance at the national level reinforce each other, dragging the Argentine political and policymaking system towards the practices and features of its most politically backward regions.

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