evaluation of seismic performance of steel frames with y-shape braces under far-field and near-field earthquakes

In this study, the finite element modeling of the y-shape bracing system is initially developed and verified. next, the seismic performance of steel frames with y-shape braces under far-field and near-field earthquakes was evaluated. for this purpose, seismic analysis was performed using 12 seismic records including near-field and far-field on 4, 8, and 12-floor structures equipped with and without y-shape bracing. a series of time history analyses were performed on the samples, which led to the precise review of the y-shape bracing system. the results show that structures equipped with y-shape braces have less lateral displacement and also less number and level of plastic hinges; and, the level of non-linear dissipated energy is higher in those structures. also, the plastic hinges based on the failure indices of the structures indicate that - near-field earthquakes have a more destructive effect of about 20% higher than far earthquakes on structures equipped with y-shape bracing. y-shaped bracing has reduced the permanent displacement in the system by up to 30%.