Comparison of Performance-based Seismic Behavior Parameters of Buckling Restrained Braced Frames for Near and Far Fault Earthquakes

Buckling-restrained braced frames (BRBFs) are efficient lateral load resisting systems with great capacity to dissipate seismic input energy. However, the near fault ground motions may impose severe damage to BRBF structures in comparison with ordinary ground motions. The results of previous researchers have proved that the modification of response spectrum cannot solely capture this effect. This paper suggests that behavour factor should be modified for near fault ground motions. In this paper, the behavior factor is evaluated for BRBF structures under near and far fault excitations, for Life Safety (LS) and Collapse Prevention (CP) limit states. The performance-based behavior factor can be used for design of structures in near and far fault regions.