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Designing steel structures with Concentric Braced Frame (CBF) lateral systems has been common in recent decades. This type of bracing has a quite unstable and complicated behavior in relatively intense earthquakes. This study tries to improve the seismic behavior of steel frames with CBF braces equipped with Shape Memory Alloy (SMA) and Buckling Restrained Braces (BRBs). In this manner, a multi-story building with inverted V chevron bracing was considered. Nonlinear time-history analyses have been performed using OpenSEES software. The dynamic responses of frames with SMA and BRB braces were compared. The results showed that the SMA and BRB braces provide energy dissipation in the nonlinear zone and can reduce maximum interstory drift. The comparison of those bracing systems revealed that implementing SMA in braces also led to a reduction in permanent displacement of the structures due to the elasticity property of the SMA bracing system. The energy dissipation of structures with the BRB system was higher than that of structures with the SMA bracing system.

Study and Comparison of the Performance of Steel Frames with BRB and SMA Bracing