正交异性钢桥面板横梁弧形切口周边应力分析  

FEA of Stress along Cope Hole Edge of Crossbeam in Orthotropic Steel Deck

作　　者：唐亮[1] 黄李骥[1] 刘高[1] 

机构地区：[1]中交公路规划设计院有限公司,北京100088

出　　处：《公路交通科技》2011年第6期83-90,共8页Journal of Highway and Transportation Research and Development

基　　金：交通运输部西部交通建设科技项目(200831849452)

摘　　要：纵肋与横梁交叉部位处横梁弧形切口周边疲劳裂纹是正交异性钢桥面板的主要病害之一。采用有限元方法对钢桥面板横梁弧形切口周边应力分布及特点进行了分析。研究表明:横梁高度对引起该类型疲劳裂纹各作用的发挥有决定性的影响,对于高度较小的柔性横梁,横梁的整体行为效应占主导地位,疲劳敏感位置遍布整个剪跨段;高度较大的刚性横梁局部行为效应显著,疲劳敏感位置仅位于轮荷载直接作用处。横梁弧形切口周边以承受面内应力为主,面外应力很小。仅就应力水平而言,高度不同的横梁其适配的切口形状不一致,Eurocode推荐的铁路桥孔型5对柔性横梁较理想,而孔型4对刚性横梁较有利。我国采用较多的扁平钢箱梁实腹式横隔板与刚性横梁相似,应用国外研究成果时需慎重。Fatigue crack initiating at the edge of cope hole in the crossbeam at the longitudinal rib-to-crossbeam joint is one of primary defects of orthotropic steel deck.The stress characteristic of the edge of cope hole in the crossbeam was analysed by employing finite element method.The results show that（1） The height of crossbeam has a significant influence on the role of various actions inducing this type of crack.The global effect of crossbeam predominates in relatively low flexible crossbeam,and the fatigue prone cracks spread all over the shear span.（2） For relatively high rigid crossbeam,local behavior is in evidence,and the fatigue cracks are located directly under the wheel load in zones subjected to compressive normal stresses.（3） The stress along the edge of cope hole is governed by in-plane component and the out-plane component is negligible.With respect to stress level,the optimal shaped cope hole is inconsistent for the crossbeams with different heights,the Shape 5 recommended for railway bridges by Eurocode is appropriate for flexible crossbeam while the Shape 4 is more favorable for rigid crossbeam.The behavior of solid diaphragms widely used in flat steel box girders in China is similar to rigid crossbeams,and application of foreign research results needs to be paid more attention.

关 键 词：桥梁工程 正交异性钢桥面板 纵肋-横梁连接接头 弧形切口 疲劳 有限元方法 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U448.36[交通运输工程—道路与铁道工程]