Research Needs for Use of Capacity Design of RC Frame Structures in China

Abstract

Standards for seismic design of building structures have been applied in China since 1978 However, the Chinese seismic design philosophy is quite different from the capacity design philosophy incorporated in New Zealand's Standards. In this paper, the disadvantages of Chinese Standards designed RC frame structures (potential structural flexural and shear collapses when subjected to “large earthquakes” at ultimate limit state level) are discussed when compared to New Zealand Standards designed frame structures. To suppress the potential flexural collapse, a cycling research project is presented, comprising of member experimental tests for hysteresis loops (further for hysteresis models), inelastic dynamic time-history analyses for seismic damage assessment purposes (taking overall structural displacement ductility as principle damage measurement), redesign of members if flexural collapse is predicted, experimental tests again of redesigned members etc. Meanwhile, having the potential shear collapse suppressed, the capacity design procedure needs to be applied to seismic design, leading to quantify the structural displacement ductility capacities.