基于改进分枝-约界法的连续刚构桥失效模式研究  

Study on Failure Mode of Continuous Rigid Frame Bridges Based on Improved Branch and Bound Method

作　　者：刘路[1] 张洪[1] 杨娟[1,2] 周建庭[1] LIU Lu;ZHANG Hong;YANG Juan;ZHOU Jianting(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Merchants Chongqing Communications Research&Design Institute Co.,Ltd.,Chongqing 400067,China)

机构地区：[1]省部共建山区桥梁及隧道工程国家重点实验室,重庆交通大学,重庆400074 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路工程》2019年第6期21-27,共7页Highway Engineering

基　　金：国家杰出青年科学基金(51425801);国家自然科学基金(51808081);重庆市技术创新与应用示范项目(社会民生类重点研发)(cstc2018jscx-mszdX0084)

摘　　要：研究目的:准确搜寻连续刚构桥的失效模式,是准确计算连续刚构桥可靠度的核心任务之一。针对连续刚构桥恒载占比较大,淹没了可变荷载效应,使失效模式在搜寻过程中出现遗漏,以及通过删除失效单元不考虑失效单元恒载引起的内力重分布,造成失效模式与结构实际受力性能不符的情况,提出了更全面反应连续刚构桥失效模式的识别方法。研究结论:对全局临界强度分枝-约界法进行改进,将构件本身恒载效应和失效单元重分布的恒载效应从结构构件有效强度中扣除,建立改进后方法的失效模式搜寻路径;利用两跨连续桥梁有限元模型和某连续刚构桥对改进后的全局临界强度分枝-约界法进行验证。结果表明:改进后的方法得到了连续刚构桥的主要失效模式,失效路径与桥梁实际破坏情况相符,且不会遗漏桥梁结构体系的失效模式。Research purpose:Accurately searching for the failure mode of continuous rigid frame bridge is one of the core tasks for accurately calculating the reliability of continuous rigid frame bridges.In view of the large load of continuous rigid frame bridge,the variable load effect is inundated and the failure mode is missed during the search process,and the failure mode and structure are eliminated by deleting the failed unit without considering the redistribution of internal forces caused by dead load of dead unit.The actual force performance does not match the situation,put forward a more comprehensive response to continuous rigid frame bridge failure mode identification method.Research conclusion:In this paper,the global critical strength branch-and-bound method is improved,and the dead load effect of the component itself and the dead-load redistribution effect are subtracted from the effective strength of the structural component.The improved search path of the failure mode is established.The cross-continuous bridge finite element model and a continuous rigid frame bridge are used to verify the improved global critical strength branch-and-bound method.The results show that the improved method has obtained the main failure mode of continuous rigid frame bridge,and the failure path coincides with the actual failure of the bridge without omitting the failure mode of the bridge structural system.

关 键 词：桥梁工程 失效模式 改进分枝-约界法 连续刚构桥 恒载效应 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]