基于解析法的悬索桥锚跨索股分析

摘要

为在悬索桥结构分析中能精确方便地计算锚跨索股下料长度以及空缆状态下各索股张力,从竖弯切点出发,考虑悬链线与多段圆之间的几何协调关系,选择合理的索力分配模式,求解成桥状态下各索股空间走形和下料长度;以不动点到锚点间的无应力长度保持不变为条件,根据假定的竖弯角和计算可得的平弯角以及竖弯切点处的几何协调条件,采用解析法求解空缆状态下各索股张力.结果表明,本方法能快速、准确地计算锚跨各索股下料长度和空缆状态下各索股张力,提高施工锚跨索股施工监控的精度.%In order to accurately and conveniently calculate fabrication length of the anchorage cable and strand tension at cable finished stage,based on the starting point of vertical-blending tangency point,considering the geometrical compatibility relationship between catenary section and multi-segment round and reasonable choice of the mode of cable force distribution,the space shape and fabrication length of the strands under the completion state are solved.In a condition of the unstressed length between the fixed point and anchor point remaining unchanged,according to the assumed coordinate vertical-bending angle,computable plane-bending angle and geometrical compatibility conditions at vertical-bending tangent point,the tension of the strands in the suspender state is calculated with the analytical method.The results show that the fabrication length of the anchorage cable and strand tension at cable finished stage could be calculated effectively,quickly and accurately,and the construction control accuracy of anchor span strands in computation of suspension bridge could be improved with this method.