EVALUATION OF SEISMIC BEHAVIOR OF STEEL FRAMES EQUIPPED WITH OFF CENTER BRACING AND EBF BRACING UNDER THE NEAR AND FAR FIELD EARTHQUAKES

In order to solve the problem of low stiffness in the framing system, as well as the problem of low formability in a frame with a coaxial bracing, Popov proposed a non-axial brace. There is a great deal of research on earthquake resistant structures today. The earthquake resistance of the structure can be improved by adding dampers to the structure. Therefore, one of the ways to reduce relative displacement and acceleration of floors is to use energy dissipation systems because they absorb and depreciate part of the earthquake input energy alone. Control methods are divided into three main categories of passive, active and semi-active control based on the need for input energy.In this study, an Evaluation of seismic behavior of steel frames equipped with OFF Center Bracing and EBF bracing under the Near and Far field earthquakes has been investigated. For this purpose, the analysis of nonlinear time histories has been performed under seven seismic records of the near and far field in ABAQUS software on 4, 8 and 12st frames equipped with OFF center and EBF bracing, shown in Figure 1.

کلیدواژه ها:

nonlinear dynamic analysis ، Off center bracing ، EBF bracing ، Near and far field earthquakes