超载导致钢筋混凝土拱桥倒塌的破坏模拟  

OVERLOAD-INDUCED PROGRESSIVE COLLAPSE SIMULATION FOR A REINFORCED CONCRETE ARCH BRIDGE

作　　者：黄盛楠[1] 陆新征[2] 郑建春[3] 朱伟[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]土木工程安全与耐久教育部重点实验室,清华大学土木工程系,北京100084 [3]北京城市系统工程研究中心,燃气、供热及地下管网运行安全北京市重点实验室,北京100089

出　　处：《工程力学》2012年第A02期122-127,138,共7页Engineering Mechanics

基　　金：交通运输部交通运输建设重大科技专项项目(2011-318-223-170);中央高校基本科研业务费专项项目(FRF-TP-12-018A)

摘　　要：拱桥在我国有着悠久的历史。近年来,拱桥倒塌事故频发,引起科研及工程人员的广泛关注。该文以某实际钢筋混凝土刚架拱桥倒塌事故为例,建立相应的非线性有限元模型。首先,针对桥墩底部不同的约束情况,设置了两种工况,并分别对因超载导致的拱桥连续倒塌过程进行分析。其次,采用基于广义刚度的构件重要性评价方法对该桥梁的构件重要性进行分析,分析结果表明刚架拱的斜撑以及斜撑与水平构件连接的部位是重要性系数较高的部位,该分析结果与倒塌模拟过程一致。Arch bridge has been used in China for a long time. In recent years, collapse accidents of arch bridges happen frequently which raised the attention of researchers and engineers. In this paper, based on an actual collapse accident of a reinforced concrete rigid-frame arch bridge, a nonlinear finite element model Was built. Firstly, to simulate different constraint conditions at the feet of the piers, two rotation stiffness cases were modeled respectively and the overload-induced progressive collapse procedures were simulated. Secondly, the bridge component importance was evaluated by using the method based on the generalized structural stiffness. It can be concluded that the importance factors are large on the brace and the joint between diagonal braces and horizontal components, which agrees well with the observed collapse process.

关 键 词：桥梁 有限元分析 超载 倒塌 重要性评价 

分 类 号：U447[建筑科学—桥梁与隧道工程]