特大跨钢箱桁架拱桥极限承载力的数值模拟

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英文篇名：Numerical simulation of ultimate bearing capacity of large-span steel box-truss arch bridge 作者：江京翼 ; 周志祥 ; 王邵锐 英文作者：JIANG Jing-yi;ZHOU Zhi-xiang;WANG Shao-rui;Guangxi Transportation Research Institute;College of Civil Engineering,Chongqing Jiaotong University; 关键词：钢桁拱 ; 极限承载力 ; 有限元法 ; 塑性铰 ; 影响因素 英文关键词：steel truss arch;;ultimate bearing capacity;;finite element method;;plastic hinge;;influencing factor 中文刊名：GSGY 英文刊名：Journal of Lanzhou University of Technology 机构：广西交通科学研究院;重庆交通大学土木工程学院; 出版日期：2016-10-15 出版单位：兰州理工大学学报 年：2016 期：v.42;No.181 基金：重庆市自然科学基金(2012jjB0118) 语种：中文; 页：GSGY201605025 页数：5 CN：05 ISSN：62-1180/N 分类号：134-138

摘要

随着钢箱桁架拱桥跨径的增大,其非线性效应变得十分突出,研究其极限承载力对于桥梁的弹性设计校核和安全性评估具有十分重要的意义.以某主跨519m的中承式钢箱桁架拱桥为例,对其建立基于塑性区理论的数值分析模型并进行极限承载力分析.结果表明,只有进行弹塑性大位移分析才能得到接近实际的极限承载力.分析极限承载力的影响因素,结果表明:面外初始几何缺陷对大桥的极限承载力影响较小,而面内初始几何缺陷会显著降低大桥的极限承载力;钢材强度对结构的极限承载力有决定性影响;整体温变作用对极限承载力的影响可以忽略.
        Along with increase of span length of steel box-truss arch bridge,its nonlinear effect becomes extremely prominent.Investigation of its ultimate bearing capacity is of great significance for checking elastic design of bridge and evaluating bridge safety.Taking a 519m-main span middle-supported steel boxtruss arch bridge as example,its numerical analysis model was established based on plasticity district theory and its ultimate bearing capacity was analyzed.The result shows that the ultimate bearing capacity approximate to the actuality can be obtained only if the analysis of elastoplastic large displacement is conducted.It is shown by the analysis of influencing factor of ultimate bearing capacity that the out-plane initial geometric imperfection will have less influence on ultimate bearing capacity while the in-plane initial geometric imperfection can remarkably decrease it.The material strength will have decisive influence on ultimate bearing capacity,but the influence of integral temperature variation on ultimate bearing capacity can be neglected.

引文

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