摘要
高烈度地震区内城市高架桥梁结构是城市交通的命脉,但当其遭遇强震导致失效时会造成不可预估的社会后果。高架桥或者其构件发生损伤导致自身不能发挥正常的使用功能时认为桥梁失效。以某六跨连续梁高架桥为工程背景,采用OpenSees软件建立了三维非线性有限元计算模型,基于增量动力分析(incremental dynamic analysis,IDA)法和加权秩和比法来判别在强震作用下该高架桥在的连续倒塌失效模式。计算过程中考虑支座的摩擦滑移,根据损伤值的变化来判断构件的状态,对连续梁桥各个构件的失效次序进行统计,给出具有统计意义的地震倒塌失效模式和最弱失效模式。结果表明:根据加权秩和比法得到的倒塌失效规律和最弱失效模式基本一致,首先是起到摩擦减震的滑动支座失效,其次是固定墩和固定支座失效,最后非固定墩失效。研究结果可为类似连续梁高架桥的抗震分析和地震失效倒塌模拟提供一定的参考和借鉴。
Urban viaduct structure is the lifeblood of urban traffic in high intensity earthquake area,but it will cause unpredictable social consequences when it fails due to strong earthquake.When the viaduct or its components are damaged and fail to function normally,the bridge is considered to be invalid.Taking a six-span continuous beam viaduct as the engineering background,a three-dimensional nonlinear finite element calculation model was established by OpenSees software.Based on incremental dynamic analysis(IDA)method and weighted rank sum ratio method,the continuous collapse failure mode of the viaduct under strong earthquakes was identified.The friction slip of bearing was considered in the calculation process,the state of the component was judged according to the change of the damage value,the failure sequence of each component of the continuous beam bridge was counted,and statistically significant failure modes and weakest failure modes were given.The results show that the failure mode based on the weighted rank sum ratio method is basically the same as the weakest failure mode.The failure of the sliding support that acts as friction damping is firstly appeared,followed by the failure of the fixed pier and the fixed bearing,and finally is the failure of the non-fixed pier.These research methods and conclusions can provide some reference for the seismic analysis and earthquake failure collapse simulation of similar continuous beam viaducts.
作者
李雪明
赵杰
温林莉
兰雯竣
LI Xue-ming;ZHAO Jie;WEN Lin-li;LAN Wen-jun(China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;Civil Engineering R&D Center,Dalian University,Dalian 116622,China)
出处
《科学技术与工程》
北大核心
2021年第8期3346-3352,共7页
Science Technology and Engineering
基金
国家自然科学基金重点项目(51738010)
国家自然科学基金面上项目(51678100)
辽宁省自然科学基金指导计划(20170540043)。
