基于性能的铁路桥墩地震损伤量化指标研究  

Research on Quantification Index for Seismic Damage of Railway Bridge Piers Based on Performance

作　　者：沈林白 洪彧[1] 周志达 文旭光 周文钦 蒲黔辉[1] SHEN Linbai;HONG Yu;ZHOU Zhida;WEN Xuguang;ZHOU Wenqin;PU Qianhui(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Guangxi Key Laboratory of International Joint for China-ASEAN Comprehensive Transportation,Nanning University,Nanning 530000,China;Sichuan Branch of Shanghai Urban Construction Design and Research Institute Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]南宁学院广西中国-东盟综合交通国际联合重点实验室,广西南宁530000 [3]上海市城市建设设计研究总院有限公司四川分公司,四川成都610031

出　　处：《铁道学报》2024年第11期155-162,共8页Journal of the China Railway Society

基　　金：广西科技计划项目(桂科AA21077011);四川省科技计划(2021YJ0054);中央高校基本科研业务费(2682022CX003)。

摘　　要：为研究铁路桥墩的地震损伤量化方法,建立OpenSees有限元模型并通过6组拟静力试验数据验证其准确性,同时对7种桥墩构造参数组成的样本空间进行拉丁超立方采样,进行339组桥墩的拟静力数值计算,分析不同损伤阶段的位移延性比分布特征,制定基于性能的多级延性损伤指标,并通过对一座混合梁桥的地震分析结果验证该指标的普适性。研究表明:339组桥墩的位移延性比呈现较强的规律性,主要分布于0.41、1.00、1.58、2.20处,因此可采用位移延性比0.41、1.00、1.58、2.20分别作为铁路矩形桥墩无、轻微、中度、严重和完全损伤状态的临界值。基于性能的延性损伤指标简易直观,可为抗震设计与震损评估工作提供理论依据及参考。In order to study the quantitative method of seismic damage of railway bridge piers,the OpenSees finite element model was established with its accuracy verified by six groups of quasi-static test data.At the same time,Latin hypercube sampling was conducted for the sample space composed of seven types of pier structural parameters,and quasi-static numerical calculations were carried out on 339 groups of bridge piers.Based on the analysis of the distribution characteristics of displacement ductility ratio in different damage stages,performance based multi-level ductile damage indicators were formulated with the universality of the indexes verified by the seismic analysis results of a hybrid beam bridge.The research shows that the displacement ductility ratio of the 339 groups of piers presents a strong regularity,with average displacement ductility ratio of 0.41 for pier minor damage,average ductility ratio of 1.00 for moderate damage,1.58 for severe damage,and 2.20 for complete failure.The displacement ductility ratio of 0.41,1.00,1.58 and 2.20 can be used as the critical values for the railway rectangular piers under no,minor,moderate,severe and complete damage conditions.The performance-based ductile damage index is simple and intuitive,which can provide theoretical basis and reference for seismic design and earthquake damage assessment.

关 键 词：铁路桥梁 矩形桥墩 位移延性比 损伤指标 易损性 

分 类 号：U24[交通运输工程—道路与铁道工程]