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A Study on the Arch-Supported Membrane Structures Resistance to Ponding Effect
Zajac, Zbyněk ; Lang, Rostislav ; Němec, Ivan
This study deals with the ability of arch-supported membrane structures to withstand water accumulation. A previously developed specialized software tool may help prevent the occurrence of the ponding effect already in the design process. The influence of dimensions, surface prestress level and membrane material was investigated. The initial support layout and topology’s influence on the occurrence of the ponding effect was proved. The study outcomes may serve as the basis for the initial dimensions design of arch-supported membrane structures.
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Analysis of membrane structures
Motyčka, Tomáš ; Zajac, Zbyněk (referee) ; Lang, Rostislav (advisor)
This thesis focuses on a comprehensive analysis and design of membrane structures that are one of the most dynamically developing areas in structural engineering. These structures, that are characterised by their ability to cover large spans with a minimum number of supporting elements and provide high levels of natural light due to their translucency, are examined in this thesis from theoretical and practical perspectives. In the theoretical part of the thesis, the basic principles of their design and analysis are described, including detailed A detailed discussion of the materials and technologies used. Special attention is paid to mechanical properties of fabrics, which are crucial for the functionality and durability of these structures. The second chapter deals with the numerical analysis of membrane structures, with an emphasis on the non linear mechanics, the form-finding process for determining the optimal shape of the structure, and methods for calculation of cutting patterns. In the practical part, case studies are presented, including the analysis of prestressed membrane of the Anthropos dance pavilion and the ETFE cushion roof structure. These studies offer insights into the challenges and solutions associated with the design and analysis of membrane structures, including detailed descriptions of the structures, calculation models and load analyses. Specific emphasis is placed on Analysis of the 'ponding' effect, a common cause of failure in these structures.
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Numerical modeling of wind load on photovoltaic panels
Zajac, Zbyněk ; Vlk, Zbyněk (referee) ; Martinásek, Josef (advisor)
This bachelor’s thesis deals with wind loading on photovoltaic panels installed on a flat roof. Numerical calculation was made for a fictitious building. Photovoltaic array was installed according to the general principles. Wind load on the array was applied in different directions in order to calculate the highest value in the area. Calculation and interpretation of results were done in ANSYS. Results were compared with coefficients given in the Dutch standard NEN 7250. This standard is not part of European standard.
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Analysis of membrane structures with respect to construction stages
Zajac, Zbyněk ; Kytýr, Jiří (referee) ; Lang, Rostislav (advisor)
This diploma thesis deals with problem of design and calculation of membrane structure. Design proces of light and airy structure was demonstrated on conical shaped roof in the finite element analysis program RFEM. The structure was loaded in the virtual wind tunnel in the program RWIND. Results were compared with the values given in the literature. A comprehensive guide for the design of membrane structures has been created. Subsequently, the influence of design stages on the internal forces was demonstrated. Membrane structures are very sensitive to construction stages, because it is not possible to prestress all membrane surfaces at once. Program by DLUBAL software s.r.o. was used for form-finding analysis during construction stages.
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Construction Stages Analysis of a Membrane Structure with Respect to Wind Load
Zajac, Zbyněk
This paper deals with an analysis of a membrane structure loaded with wind pressure with respect to the construction stages. Modern tools allow analysis of structural response to the prestressing of membrane surfaces in the predefined sequence. So far, analytical models of the membrane structures have been simplified and the sequence of construction has been designed afterwards. This process may lead to the oversized elements, because it is not possible to estimate the structural response to the unexpected load on the structure under construction. Besides, the aim of this paper is to point out the meaning of the construction stages analysis of the membrane structures with respect to the safety on a building site.
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Analysis of membrane structures with respect to construction stages
Zajac, Zbyněk ; Kytýr, Jiří (referee) ; Lang, Rostislav (advisor)
This diploma thesis deals with problem of design and calculation of membrane structure. Design proces of light and airy structure was demonstrated on conical shaped roof in the finite element analysis program RFEM. The structure was loaded in the virtual wind tunnel in the program RWIND. Results were compared with the values given in the literature. A comprehensive guide for the design of membrane structures has been created. Subsequently, the influence of design stages on the internal forces was demonstrated. Membrane structures are very sensitive to construction stages, because it is not possible to prestress all membrane surfaces at once. Program by DLUBAL software s.r.o. was used for form-finding analysis during construction stages.
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Numerical modeling of wind load on photovoltaic panels
Zajac, Zbyněk ; Vlk, Zbyněk (referee) ; Martinásek, Josef (advisor)
This bachelor’s thesis deals with wind loading on photovoltaic panels installed on a flat roof. Numerical calculation was made for a fictitious building. Photovoltaic array was installed according to the general principles. Wind load on the array was applied in different directions in order to calculate the highest value in the area. Calculation and interpretation of results were done in ANSYS. Results were compared with coefficients given in the Dutch standard NEN 7250. This standard is not part of European standard.
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