桥梁结构失效模式搜索的分枝-约界法  

Branch and Bound Method for Bridge Failure Mode Approach

作　　者：高欣[1] 欧进萍[1,2] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]大连理工大学土木水利学院,辽宁大连116024

出　　处：《华中科技大学学报（城市科学版）》2008年第4期227-231,共5页Journal of Huazhong University of Science and Technology

基　　金：西部交通科技项目(200631822349)

摘　　要：对结构整体进行可靠性及风险分析,可以预防桥梁在其生命周期内发生垮塌等灾难性工程事故。目前,普遍认同的分析方法是结构体系可靠度理论,其首要问题是寻找桥梁可能出现的各种失效模式。针对桥梁结构失效模式搜索问题,本文以阶段临界强度分枝-约界法作为搜索准则,以车辆荷载作为主要荷载,介绍了系统极限状态定义、有限元结构建模及拓扑结构变化的实现、失效树遍历法则、最短失效路径集合搜索法则、伪失效模式的修正法则等相关内容,给出了搜索流程的主要步骤及实现方法。最后,将该方法应用于某钢桁架桥具体实例,结果表明:分枝-约界法能够搜索到该桥的主要失效模式,包括对称失效模式及最短失效模式。The increasing demands for systematic and effective risk-safety assessment in each step of large-scale construction projects especially bridges can better prevent possible disasters in the life time of the project. As a method of bridge safety assessment, the structural reliability analysis is widely accepted and the key point is to find out the possible failure mode of bridge. Focuses on the problem of bridge failure mode approach under traffic load, uses branch-and-bound method as the approaching rule and traffic load as the main load style, the paper discussed some concerned problems including the definition of the limit states, the finite element modeling and updating, fault tree traversal algorithms, searching the shortest failure path set, false failure mode updating method. Finally, the methods are used in the analysis of a steel truss bridge. The results show that the methods can find out most important failure mode including the symmetrical failure modes and the shortest one.

关 键 词：车辆荷载 分枝-约界法 桥梁结构 失效模式 

分 类 号：U447[建筑科学—桥梁与隧道工程]