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Abstract(s)
A presente dissertação tem como objetivo estudar diferentes modos de conceber estruturas do tipo casca e a influência no comportamento estrutural.
Para esse efeito avaliam-se questões de comportamento estrutural para soluções cuja forma estrutural resulta de diferentes procedimentos e opções. Como referências foram tomados exemplos de coberturas em casca de Heinz Isler e Félix Candela.
Estruturalmente as cascas destacam-se por apresentarem uma grande eficiência na resposta às ações a que estão sujeitas, sendo o exemplo perfeito de como aumentar a resistência pela forma em oposição à resistência pela massa. O mecanismo resistente é caracterizado pelo desenvolvimento de esforços maioritariamente no plano, esforços de membrana, com esforços de flexão globalmente pouco relevantes.
O presente trabalho centrou-se essencialmente em aspetos de comportamento estrutural, tendo tentando fornecer informações do mesmo de forma antecipada, antes da obtenção da forma. Nesse sentido, foca-se na relação entre as caraterísticas de modelos planos iniciais e o comportamento estrutural da forma de casca resultante. Assim, pretende ser um contributo para novas conceções de estruturas deste tipo, como um maior enquadramento sob o ponto de vista de mecânica.
This thesis aims to study different ways of designing shell structures and to the influence on structural behavior. For this purpose, questions of structural behavior are evaluated for solutions whose structural form results from different procedures and options. As references were taken examples of shell roofs structures of Heinz Isler and Félix Candela. Structurally, the shells stand out by their high efficient response to external actions, being the perfect example of strength through form opposed to strength through mass. The resistant mechanism is characterized by the development of mostly plane stresses, membrane stresses, with bending forces globally irrelevant. The present work focused mainly on aspects of structural behavior, by having attempted to provide information about it in advance, before obtaining the form. In this sense, it focuses on the relationship between the characteristics of initial plane models and the structural behavior of the resulting shell shape. Therefore, it intends to be a contribution to new concessions of structures of this type, as a greater framework from the mechanic point of view.
This thesis aims to study different ways of designing shell structures and to the influence on structural behavior. For this purpose, questions of structural behavior are evaluated for solutions whose structural form results from different procedures and options. As references were taken examples of shell roofs structures of Heinz Isler and Félix Candela. Structurally, the shells stand out by their high efficient response to external actions, being the perfect example of strength through form opposed to strength through mass. The resistant mechanism is characterized by the development of mostly plane stresses, membrane stresses, with bending forces globally irrelevant. The present work focused mainly on aspects of structural behavior, by having attempted to provide information about it in advance, before obtaining the form. In this sense, it focuses on the relationship between the characteristics of initial plane models and the structural behavior of the resulting shell shape. Therefore, it intends to be a contribution to new concessions of structures of this type, as a greater framework from the mechanic point of view.
Description
Keywords
Anti-Funicular Betão Armado Estruturas de Cascas Forças Membrana Paraboloide Pré-Esforço Rigidez