四川轻化工大学学报（自然科学版）2025，Vol.38Issue(5)：91-100,10.DOI:10.11863/j.suse.2025.05.10
大跨度铁路梁桥地震易损性分析评价
Seismic Vulnerability Analysis and Evaluation of Large-span Railroad Girder Bridges
摘要
Abstract
To investigate the seismic performance of a typical four-span railway bridge in China,a real bridge in China is selected as the research object,and refined finite element modeling is conducted using Midas Civil software.Fifteen seismic records that meet the engineering geological conditions of the bridge are retrieved from the Pacific Earthquake Engineering Research Center(PEER)database based on the target spectrum.The displacement at the pier top is taken as the quantitative index of damage for the continuous beam bridge.The Incremental Dynamic Analysis(IDA)method is employed to conduct nonlinear time-history analysis on the bridge structure.The frequencies of falling into each damage level are counted and their percentages are calculated.Based on the logarithmic linear regression analysis of the capacity demand ratio,the vulnerability curve is plotted.Finally,the system vulnerability curve of the entire bridge is established through the First-Order Bounds Method.The research results indicate that the probabilities of slight and moderate damage occurring to the border piers(Pier 1#and Pier 5#)are slightly higher than those of the main piers(Pier 2#,Pier 3#,and Pier 4#).However,the probabilities of severe and collapse damage for the main piers are significantly higher than those of the border piers.When the maximum peak acceleration set in this study is reached,the probabilities of collapse damage are respectively 16.98%,32.03%,64.58%,41.81%,and 26.09%.Furthermore,the failure probability of the bridge system is higher than that of a single component,suggesting that conducting vulnerability analysis solely on individual components is inadequate for ensuring the safe design of the structure.关键词
高速铁路桥/时程分析/增量动力法/地震易损性/一阶界限法Key words
high-speed railroad bridge/time-course analysis/incremental dynamic analysis/seismic vulnerability/first-order bounds method分类
土木建筑引用本文复制引用
李宁波,朱清帅,束庆东,陈熙,陈家豪,陈志..大跨度铁路梁桥地震易损性分析评价[J].四川轻化工大学学报（自然科学版）,2025,38(5):91-100,10.基金项目
建筑健康监测与灾害预防技术国家地方联合工程实验室主任基金项目(GG22KF002) （GG22KF002）
安徽省高校省级研究重点项目(2023AH050182) （2023AH050182）
安徽省教育厅研究生质量工程项目(2023xscx104 （）
2023cxcysj124) （）
