Numerical study on seismic performance of prefabricated steel frames with recentering energy dissipative braces

摘要

The application and research of prefabricated steel structures (PPSs) have developed rapidly in China. To improve the seismic resistance of PPSs, alternative bracing systems have been developed. The seismic performance of steel frames with recentering energy dissipative (RCED) braces is investigated numerically through quasistatic and nonlinear time history analyses. A one-bay braced frame model was first created in ABAQUS and calibrated by previous experimental tests. Subsequently, a comparative study on the dynamic performances of the multistory steel frames with RCED braces and self-centering energy dissipative braces was conducted. Six far-field earthquake records were adopted, i.e., Northridge, Imperial Valley, Kobe, San Fernando, Loma Prieta, and Kocaeli, Turkey. Finally, a parametric study was performed to investigate the effects of tendon diameter and pretension magnitude of high-strength bolts on the seismic performances of the RCED model under the Kocaeli earthquake.