Análise Paramétrica de Ligações com Placa de Extremidade em Estruturas de Aço Submetidas a Momento Fletor e Força Axial

• Autor(a) principal: Nunes, Pedro Carlos da Lomba
• Data de Publicação: 2006
• 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/1/11523
• topic: Beam-to-Column Joints; Semi-Rigid Joints; Experimental Analysis; Mechanical Models; Component Method; European Codes; Bending Resistance; Axial Force Resistance.; Ligações Viga-Coluna; Ligações Semi-Rígidas; Análise Experimental; Modelos Mecânicos; Método das Componentes; Normas Européias; Resistência à Flexão; Resistência a Esforço Axial.; Estrutura metálica; Aço Estruturas; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

Traditionally, the steel portal frame design assumes that beam-to-column joints are rigidor pinned. Rigid joints, where no relative rotations occur between the connected members, transfer not only substantial bending moments, but also shear and axial forces. On the other extreme, pinned joints, are characterised by almost free rotation movement between the connected elements that prevents the transmission of bending moments. Despite these facts, it is largely recognised that the great majority of joints does not exhibit such idealised behaviour. In fact, many joints transfer some bending moments with associated rotations. These joints are called semi-rigid, and their design should be performed according to their real structural behaviour. However, some steel beam-to-column joints are often subjected to a combination of bending (M) and axial forces (N). The level of axial forces in the joint may be significant, typical of pitched-roof portal frames, sway frames or frames with incomplete floors. Current standard for steel joints do not take into account the presence of axial forces (tension and/or compression) in the joints. A single empirical limitation of 5% of the beam s plastic axial capacity is the only enforced provision in Eurocode 3. The objective of the present work is to perform a parametrical analysis of two bolted joints types in order to evaluate the influence of M/N combinations in the joints global response. To fulfil this objective, the experimental results obtained by Lima [1] are compared to the analytical results using the Cerfontaine analytical model [2], [3].