Estudo de ligações semirrígidas em estruturas metálicas: comparação entre modelos

Abstract

In the design of metal structures some idealizations and simplifications of their behavior are realized, the idealized behavior of the connections between structural elements in rigid or flexible, for example. However, the real performance is different from the idealized and the connections present behaviors of partial stiffness in several degrees, in this way connection can be characterized by their behavior rotation as a function of the applied moment. It is noted that connections are an important part in the overall behavior of steel structures, and when their behavior is idealized in design, the resulting stresses are altered. In this way, the present work, studies the semi - rigid behavior of a top - and - seat angle type connection, due to highlight the importance of the analysis of this behavior. For this study, four methods were used due to analyzing the moment x rotation curve: Frye & Morris polynomial model; Potential model of Ang & Morris; Component Method - Eurocode (2005); Finite Element Method (MEF). In the MEF analysis, the connections was modeled in the ANSYS software and the results of this method were used as reference for comparison with the others. It was concluded that there is a considerable variation between the methods used to obtain the connection stiffness, and for all the methods studied, the connection presents a semi-rigid behavior, in this way, it shows that is important considerer the connection semi-rigidity behavior in structural analysis.