大跨悬索桥地锚吊索设置方案分析

Schematic Analysis of Long-span Suspension Bridge Hangers Anchored to Ground

为确定地锚吊索数量、位置、受力及方向,依托在建虎跳峡金沙江大桥,建立基准、无吊索、单索系列、双索系列、三索系列、工程实施6类有限元模型。将基准模型分别与其他模型主缆节点坐标偏差进行对比,并比较不同模型的加劲梁端吊索拉力、加劲梁应力及支座反力。结果表明,相比工程实施模型,推荐的单索、双索、三索模型主缆线形均得到改善,更接近基准模型。文中方法可用于悬索桥地锚吊索的设计。

In order to determine number,locations,forces and direction of the hangers,six kinds of finite element models are built based on Hutiaoxia Jinsha River suspension bridge,benchmark,no hangers anchored to ground,single hanger anchored to ground,double hangers anchored to ground,triple hangers anchored to ground and project implementation.The datum model is compared with the coordinate deviation of the main cable nodes of other modes,and the sling tension,stiffening beam stress and support reaction of different models are compared.The result reveals that models with single,double,triple hangers anchored to ground than original model with main cables’line type can get better,and closer to the benchmark model.Method in this paper can be put into use for suspension bridge design of hangers anchored to ground.