场地及碰撞效应对连续刚构桥剪切易损性影响  

Effect of the actual site and pounding on shear fragility of high-pier continuous rigid-frame bridge

作　　者：赵金钢[1] 李晰[2] 贾宏宇[2] 杨灿 ZHAO Jingang;LI Xi;JIA Hongyu(College of Civil Engineering,Guizhou University,Guiyang 550025,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025 [2]西南交通大学土木学院,四川成都610031 [3]湖北省交通规划设计院股份有限公司,湖北武汉430051

出　　处：《山东建筑大学学报》2019年第5期27-35,共9页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(11602061);贵州省科技计划项目(黔科合基础[2019]1125);贵州省土木工程一流学科建设项目(QYNYL[2017]0013);贵州大学引进人才项目(201517)

摘　　要：剪切破损是钢筋混凝土墩柱的一种危险的破坏形式,研究实际场地土层分布和碰撞效应对钢筋混凝土墩柱剪切易损性的影响,可以为既有桥梁抗震加固设计提供参考依据。文章以某钢筋混凝土高墩大跨连续刚构桥为研究对象,同时考虑桥位处实际土层分布对基岩地震波的过滤作用,基于OpenSees软件建立全桥空间有限元模型,进行增量动力非线性分析,研究高墩剪切易损性。结果表明:高墩剪切损伤概率受碰撞效应影响较小,而受场地效应的影响较大,并且场地效应对高墩(3#墩)剪切易损性的影响大于次高墩(2#墩);2#、3#墩发生轻微损伤和中等损伤的概率均较大,而2#墩发生严重损伤和完全损伤的概率较大,3#墩发生严重损伤和完全损伤的概率较小。高墩大跨连续刚构桥进行抗震设计时,应考虑实际场地效应对高墩剪切损伤的影响。The shear damage a dangerous failure mode of reinforced concrete piers.The study of the influence of actual soil distribution and pounding effect on shear fragility of reinforced concrete piers can provide reference for antiseismic strengthening design of existing high-pier bridges.A real reinforced concrete high-pier and long-span continuous rigid-frame bridge is taken as the research object.And the filtering effect of the actual soil layer distribution on the seismic wave of bedrock is considered.Based on the OpenSees software,the spatial finite element model of the whole bridge is built and the incremental dynamic nonlinear analysis is performed to analysis on the shear fragility of the bridge.The results show that the shear damage probability of high-pier has little influence by the pounding effect and has great influence by the site effect.And the influence of the site effect on the shear damage probability of the Pier 3#is greater than the Pier 2#.The probability of slight damage and moderate damage of the Pier 2#and the Pier 3#is greater,and the probability of severe damage and complete damage of the Pier 2#is greater,while the probability of severe damage and complete damage of the Pier 3#is lower.The effect of actual site effect on the shear damage of high-pier should be considered when the seismic design of high-pier and long-span continuous rigid-frame bridge is carried out.

关 键 词：高墩连续刚构桥 场地效应 碰撞效应 剪切易损性 

分 类 号：U443.2[建筑科学—桥梁与隧道工程]