支座摩擦滑移和挡块力学性能退化影响下桥梁易损性研究  

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

作　　者：李悦[1] 李治 李冲 Li Yue;Li Zhi;Li Chong(North China University of Technology,Beijing 100144,China;CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing 100088,China)

机构地区：[1]北方工业大学,北京100144 [2]中交公路长大桥建设国家工程研究中心有限公司,北京100088

出　　处：《土木工程学报》2020年第S02期280-287,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(51408009);北京市属高校基本科研业务费(110052971921/062);北方工业大学毓优人才支持计划(XN012/044)

摘　　要：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。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.

关 键 词：板式橡胶支座 摩擦滑移 挡块 力学性能退化 易损性曲线 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]