1.Xi’an University of Architecture and Technology;2.RBS Architectural Engineering Design Associates Shanghai Office;3.Tong Yuan Design Group CO..LTD
National Key R&D Program of China（No. 2019YFC1509302），National Natural Science Foundation of China（No. 51678475），Science and Technology Program of Xi’an, China（2019113813CXSF016SF026），Industrialization Project of Shaanxi Education Department (No. 18JC020)
In order to systematically evaluate the seismic collapse resistance of RC frame structures in China, 66 typical RC frame structures were designed in accordance with the current codes. Based on OPENSEES platform, the lumped plastic hinge model of typical RC frame structures considering shear deformation of joints was estab-lished. IDA curves and collapse points of typical structures were obtained by IDA analysis method. Furthermore, effects of building seismic fortification levels, storeys and span on the collapse margin ratio (CMR) were ana-lyzed, and the seismic collapse resistance of the RC frame structure under major earthquakes and severe earth-quakes was evaluated. The results show that, the CMR of the RC frame structure designed according to China""s current codes has a negative correlation with the seismic fortification levels and stories, but has a weak correla-tion with the span; the RC frame structure designed in accordance with the current code can meet the fortifica-tion requirements of major earthquake, but its ability to withstand the effects of severe earthquakes is obviously insufficient. Among them, the 7.5 degree fortified RC frame structure has the weakest ability to resist collapse.