Mohammad Vaghefi

Bracings, due to their high rigidity and strength, are widely employed in seismic design of steel buildings. They play a fundamental role in the absorption and dissipation of earthquake forces. Failures of braced steel buildings are often due to the shortage of compressive strength and out-of-plane buckling of bracing connections. One of the factors which contributes to the buckling behavior of gusset plates is position and type of connection of bracing to the gusset plate. In this paper, the pre- and post-buckling behavior of gusset plates is studied considering the presence or absence of longitudinal and transverse stifeners on the bracing splice plates as well as the arrangement of edge stifeners on gusset plates. To this purpose, a nonlinear static analysis is performed, the results of which are compared to the results obtained from the laboratory model. Results of the research show that application of longitudinal stiffeners leads to an increase in the buckling and post-buckling behavior of gusset plate while transverse stiffeners only in uence the post-buckling behavior of gusset plate. In addition, implementation of double stiffeners on a gusset plate somewhat adds to the buckling capacity of the gusset plate, but asects post-buckling behavior of gusset plate better.