钢桁梁悬索桥柔性中央扣梁端锚固方式比较研究

Comparative Study of Cable-girder Anchorage Styles for Flexible Central Buckles of Steel Truss Girder Suspension Bridge

通过比较某在建的大跨径钢桁梁悬索桥上2种柔性中央扣斜拉索梁端锚固方式,研究了锚箱式和耳板式柔性中央扣锚固系统的构造和设置方法,并运用大型有限元分析软件ANSYS进行了空间有限元分析,分析了锚固系统的传力途径及各板件的应力分布情况,分析结果表明柔性中央扣斜拉索耳板式锚固系统应力集中点较少且应力极值较小,相比锚箱式系统更适合在索力不太大又受结构安装空间限制的钢桁梁悬索桥上使用。该结论可为今后在同类大跨径钢桁梁悬索桥上选择合适的柔性中央扣斜拉索梁端锚固系统提供有意义的参考。

By comparing two kinds of cable-girder anchorage styles （ anchor-box style and ear-plate style） for flexible central buckles of a long-span steel truss girder suspension bridge under construction, the structures and installation methods of two kinds of flexible central buckle anchorage system are studied. Then, by using ANSYS for FEM analysis, the stress transferring mechanism of the cable anchorage system and stress distribution of plates are analyzed. The results show that the stress concentration points and extreme stress of the cable-stayed ear-plate style of flexible central buckle anchoring system are less, it is more suitable for the steel truss beam suspension bridge whose cable force being not too large and structure installation space being limited compared to the anchor-box system. The conclusion could be a meaningful reference for choosing the appropriate design of flexible central buckle cable-girder anchorage system for the similar steel trussed girder suspension bridge.