支座摩擦滑移和挡块力学性能退化影响下#br# 桥梁易损性研究

为探究支座摩擦滑移和挡块力学性能退化的共同作用对桥梁墩柱及支座在地震作用中的影响，通过板式橡胶支座往复荷载试验，建立可以考虑摩擦滑移的支座计算模型，并结合挡块模型，对同时考虑支座摩擦滑移和挡块力学性能退化的桥梁进行地震损伤分析。利用易损性曲线的方法对近、远场地震作用下，桥梁墩柱和支座的损伤概率进行分析，结果表明：板式橡胶支座摩擦滑移会降低支座的力学性能；仅考虑支座摩擦滑移而不考虑挡块限位作用时墩柱损伤概率较低，支座的损伤概率较高；当支座摩擦与挡块退化共同作用时，会增加支座的损伤概率，降低墩柱的损伤并且由于挡块力学性能退化的特性，可能造成挡块和梁体的损坏。

Bridge vulnerability under the influence of bearing friction-slip and#br# performance degradation of stoppers

In order to explore the influence of bearing friction-slip and performance degradation of stoppers on the seismic action of pier column and support of bridge, the bearing model considered friction slip is established by reciprocating load test of plate rubber bearing. Combined with stoppers model, seismic damage analysis is carried out on bridges which consider friction slip and mechanical property degradation of stoppers. The damage probability of pier column and support under near and far field earthquake is analyzed by the method of vulnerability curve, and it is concluded that the friction slip of plate rubber bearing will reduce the mechanical properties of the pier, the damage probability of pier column is lower and the damage probability of pier is higher when the friction is combined.