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正交异性钢桥面板横梁弧形切口周边应力分析

, PP. 83-90

Keywords: 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

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Abstract:

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。

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