Análise da influência de ligações semirrígidas na robustez de pórticos metálicos

Abstract

In recent years, the interest in knowing and evaluating the post-critical path of structures has grown considerably, mainly due to the increase in the number of terrorist attacks. In steel structures, joints are of great importance in its structural behavior, and ensuring adequate resistance is essential for preventing progressive collapse. In order to provide data about the development of internal stresses of such analysis, this dissertation presents a set of parametric analyses of steel structures with bolted flush endplate semi-rigid joints by means of numerical models based on finite element method, simulating an event of loss of an internal column. The robustness of the structure was evaluated, as well as the development of internal stresses and structural response of the joints. Then, the results were evaluated according to the main design codes of robustness. It was verified that the existence of elements able to withstand great efforts of tension is conditional to increase the robustness of the structure and to aid the prevention of progressive collapse. In addition, it was noticed that most of the evaluated joints were able to meet the criteria of the codes of prevention of progressive collapse.