Análise da resposta dinâmica experimental de uma passarela tubular mista, aço-concreto, submetida ao caminhar humano.

• Autor(a) principal: Zúñga, José Eduardo Villarroel
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/11543
• topic: Dynamic analysis; Pedestrian footbridges; Composite (steel-concrete) tubular footbridge; Modal analysis; Computational modeling; Análise dinâmica; Passarelas de pedestres; Estrutura tubular mista (aço-concreto); Análise modal experimental; Instrumentação dinâmica; Modelagem computacional; Estruturas mistas de aço e concreto; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

This research has as main objective the development of a dynamical experimental investigation of a real structure a tubular composite steel-concrete footbridge. The structural system of this study corresponds to a footbridge composed by three spans (32,5m, 17,5m and 20,0m, respectively) and two overhangs (7,50m and 5,0m, respectively), spanning 82,5m. The investigated structural model is composed by a continuous tubular steel structure with welded connections supported by four double file steel columns. It is structurally composed of two plane trusses are intertwined by horizontal bracing set in upper and lower chord of the truss and slabs of concrete, forming effective composite with complete interaction. This structure is currently submitted to pedestrians and cyclists crossing. Experimental tests were carried out on the structural system and with the numerical results. For the numerical modeling, discretization techniques via finite element method were applied, based on the ANSYS program. The experimental results were analyzed according to the developed methodology, and a modal analysis was implemented to determine the dynamical properties: frequencies, mode shapes and modal damping ratio, while the structure results in terms of peak acceleration, was obtained and compared to the limit values proposed by several authors and design recommendations, for the structure performance by pedestrian walking regarding the acceptance criteria for human comfort.