摘要
减、隔震支座中增设剪力键,能提高桥梁的综合性能。为精确分析隔震桥梁的地震反应,建立了设置剪力键的减、隔震支座滞回模型,提出了剪力键的数值模拟方法。以某连续梁桥为背景,建立了全桥有限元分析模型,通过3种情况下桥梁地震反应分析结果的对比研究,验证了剪力键模拟方法的有效性。变化剪力键的水平承载力大小,分析了剪力键对减、隔震桥梁地震反应的影响。结果表明,剪力键对隔震桥梁的墩底弯矩有较大影响,隔震桥梁的地震反应分析时需考虑剪力键的影响。
Comprehensive performance of the isolated bridge can be improved by the shear key installed in isolation bearing. For accurate analysis of the seismic responses of isolated bridge, the hysteresis model of the isolation bear- ing with shear key was established, and the simulation of shear key was carried out. Based on a continuous girder bridge, the finite element analysis model of the full-bridge was established and the simulation of isolation bearing with shear key was validated by the comparison among the seismic responses of the isolated bridge under three ca- ses. Effect of the shear key on the seismic responses of isolated bridge was assessed by varying the horizontal load beating capacity of shear key. The results show that the horizontal load bearing capacity of shear key has a great im- pact on the bending moment of pier base of the isolated bridge, and the impact of shear key on the seismic respon- ses of the isolated bridge should be considered in the seismic design.
出处
《地震工程与工程振动》
CSCD
北大核心
2012年第6期104-109,共6页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51108220)
长江学者和创新团队发展计划项目(IRT1139)
关键词
剪力键
隔震支座
桥梁
地震反应
shear key
isolation bearing
bridge
seismic response
