Navegando por Autor "Baier, Bernd"

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    Membrane roof for an amphitheater in Brazil : searching for the optimal design.
    (2015) Nunes, Eliana Ferreira; Sousa Junior, João Batista Marques de; Baier, Bernd; Sarmanho, Arlene Maria Cunha
    This paper addresses the investigation of the performance of a structural membrane roof project for an amphitheater in Ouro Preto, Brazil. It aims to improve the geometry of the roof structural system in order to withstand structural loads with minimal system mass. This investigation is based on nonlinear structural analysis. A set of design parameters was investigated leading to eight models with different geometry. The numerical analysis and comparison of the models showed that the optimal performance of these structures is a result of the refined adjustment of the spatial arrangement of the whole structure and the geometry of the membrane aiming for the form that reveals the best load path and improves the cooperative interaction among all components.
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    Qualitative investigation of the performance of a structural membrane roof project.
    (2012) Nunes, Eliana Ferreira; Sousa Junior, João Batista Marques de; Baier, Bernd; Sarmanho, Arlene Maria Cunha
    This paper provides a qualitative investigation about the structural performance of the membranes, surface structures (with double curvature in opposite directions) with minimum thickness and weight, which absorb forces in form of tensile stresses in its own plane, considering two aspects: structural and design procedure. Initially, it involved the analyses of lightweight structure buildings and the observation of constructive work process in membrane roofs. These investigations allowed identifying strategies that contribute to achieve optimum system performance and the challenges encountered along the stages of designing and building. They also guided the qualitative analysis of the performance of a structural membrane roofing project, i.e., a particular situation, as example. This qualitative analysis was developed in two stages, guided by experimental and numerical data. The first stage involved the optimization procedure of the structural system under load action. This analysis showed that the flexible system performance is a result of the three-dimensional stability of the structural system (arrangement and geometry of all components), membrane surface stiffness (membrane geometry), as well as the cooperation of all components in pre-tension state. The second stage comprised the experimental investigation of the membrane material behaviour within the structure context in order to analyze the flattened membrane geometry. Such evaluation enabled to verify the difference between the theoretical model (shape of equilibrium) and the actual shape (consisting of flat panels), enabling the proper adjustment of the surface geometry so that the final shape can reveal not only the path of the forces, but also the best use of the material. The investigations, analyses and working procedure here adopted broadened the understanding of this system pointing possibilities to increase its performance and to minimize failures during the preliminary stage of design.