SEISMIC ASSESSMENT OF CONTROLLED ROCKING STEEL BRACED FRAME

Enhancement of seismic resilience of structuresunder severe earthquake is attainable with various system such as controlled rocking self centering concentric braced frame, SC-WCBF-CR. This paper investigates the rocking effect in the SC-WCBF-CR system in comparition with conventional steel braced frame,WCBF_FBD time-history nonlinear dynamic analysis of 9-story SC-WCBF-CR and WCBF_FB seismic systems is conducted using two horizontal components ofrecords of far-fault scaled under DBE and MCE hazard level. The results of time history analyses of these systems are compared to each other. The results of seismic analysis show enhancement in performance of SC-WCBF-CR system in significant decrease in permanent drift and nonlinear deformations, and creation of damge concentration in fuse element in comparison with WCBF_FB system.