The Over-Strength Coefficient of Masonry-Infilled RC Frame Structures under Bidirectional Ground Motions

The over-strength coefficient is one of the key factors for seismic safety a structure. For RC frames, infill wall may improve lateral bearing capacity, while demand increases as well, which leads to unexpected performance an infilled frame in past earthquakes. Therefore, it necessary systematically study effect frames from point capacity and demand. In this paper, 36 structures with/without walls are designed, corresponding finite element modelings, considering in-plane out-of-plane coupling walls, established conduct incremental dynamic analyses (IDA). values coefficients calculated, utilizing IDA results under bidirectional ground motions. effects precautionary intensity number stories on discussed. value apparently higher than that bare frame, due contribution walls. However, analysis shows capacity–demand ratio masonry-infilled greatly reduced, especially bottom soft-story frame.