近断层地震作用下不同隔震装置的RC框架抗震性能研究

Study on the seismic performance of RC frame with various isolators subjecting near-fault earthquakes

对近断层地震作用下不同隔震支座对RC框架结构抗震性能的改善进行了对比研究。对比的隔震支座有:铅芯橡胶支座(LRB)、摩擦摆支座(FPB)以及恢复力-摩擦支座(R-FBI)。对基底隔震结构进行非线性时程分析。结果表明:通常LRB隔震框架会产生较其他两种隔震框架更大的顶层峰值位移、底层层间峰值偏移比以及支座峰值位移,即LRB隔震效果最差;FPB隔震框架与R-FBI隔震框架会产生非常相近的底层层间偏移比,而FPB隔震框架会出现较R-FBI隔震框架稍大的顶层峰值位移与支座峰值位移,即FPB隔震效果比R-FBI稍差,R-FBI隔震效果最好。

This paper presents a comparison analysis of seismic performance assessment of reinforced concrete（ RC） with various isolation systems in improving the performance of frame structure subjecting near-fault earthquakes. The isolation systems in this study are lead rubber bearing（ LRB）,friction pendulum bearing（ FPB）,and resilient-friction base isolator（ R-FBI）. Nonlinear time-history analyses of an isolated frame structure are performed to compare the performance of various isolation systems. The results indicate that,in particular,LRB results in a biggest peak roof drift,first-story drift ratio and peck bearing drift compared to the other isolation systems,meaning that LRB processes the worst isolation effect. First-story drift ratio for the FPB and R-FBI are very similar,while the FPB results in a little bigger peak roof drift and peck bearing drift,meaning that R-FBI processes the best isolation effect.