温度对铅芯橡胶支座隔震桥梁抗震性能的影响分析  

Effect of temperature on seismic performance of lead rubber bearing isolated bridges

作　　者：李悦 高崇铭 李冲 李治 LI Yue;GAO Chongming;LI Chong;LI Zhi(College of Civil Engineering,North China University of Technology,Beijing 100144,China;CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing 100088,China;North China Branch of Jiangsu Zhongnan Construction Industry Group Co.,Ltd.,Beijing 100071,China)

机构地区：[1]北方工业大学土木工程学院,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 [3]江苏中南建筑产业集团有限责任公司华北分公司,北京100071

出　　处：《世界地震工程》2020年第4期178-184,共7页World Earthquake Engineering

基　　金：国家自然科学基金(51408009,51608010);北京市属高校基本科研业务费项目(110052971921/062);北方工业大学毓优人才支持计划(XN012/044)。

摘　　要：为了研究温度对铅芯橡胶支座(LRB)隔震桥梁抗震性能的影响,以一座七跨连续梁桥为对象,考虑LRB在夏季和冬季不同温度下的力学特性,利用OpenSees对桥梁抗震性能进行研究。通过对不同温度下墩柱、支座及桥梁系统的地震易损性分析,获得了温度对铅芯橡胶支座隔震桥梁抗震性能的影响。结果表明:(1)与夏季相比,冬季低温降低了桥墩的延性及LRB的剪切变形和耗能能力,使地震作用时墩顶位移和支座变形均小于夏季,降低了LRB的减震效果;(2)冬季低温增大了地震作用时桥墩、LRB及桥梁系统在各个破坏状态的损伤概率,在中等及严重破坏状态时损伤概率相比夏季分别增加了8%和15%。在寒冷地区进行LRB隔震桥梁设计时,应考虑低温导致的LRB隔震效果降低对桥梁抗震性能的影响。In order to study the effect of temperature on the seismic performance of lead rubber bearing(LRB)isolated bridges,a seven-span continuous girder bridge was studied by OpenSees considering the different mechanical characteristics of LRB in summer and winter.Through the seismic vulnerability analysis of pier column,bearing and bridge system under different temperatures,the effect of the temperatures on the seismic performance of the lead rubber bearing isolated bridge was obtained.The results show that:(1)Compared with summer,the low temperature in winter reduces the ductility of the piers,the shear deformation and energy dissipation capacity of LRB,so that the displacement of the pier top and the deformation of the bearing during earthquake less than that in summer,which reduces the damping effect of LRB;(2)The low temperature in winter increases the damage probability of the piers,LRB and bridge system in every earthquake damage states.The damage probability in the moderate and extensive damage state are increased by 8%and 15%respectively compared with summer.In the design of LRB isolated bridges in cold region,the effect of low temperature on the seismic performance of LRB should be considered.

关 键 词：铅芯橡胶支座 OPENSEES 易损性曲线 位移延性 剪切变形能力 

分 类 号：TU375.4[建筑科学—结构工程]