基于梁格法的非对称斜拉桥施工阶段索力分析

Cable force analysis of asymmetric cable-stayed bridges during construction stage based on beam grid method

以某独塔双索面混合梁斜拉桥为工程背景,结合有限元数值模拟对该斜拉桥的施工阶段索力进行了分析;结果表明采用差值法计算得到的成桥索力经过十次迭代后可满足施工要求;斜拉索索力之间存在耦合关系,距离变化索力越近的斜拉索所受影响越大;二次张拉前钢梁已全部拼接完成,导致不同施工方法对拉索二次张拉力影响较小,说明钢梁内力变化对索力更为敏感。

This article takes a single tower double cable plane hybrid beam cable-stayed bridge as the engineering background,and combines finite element numerical simulation to analyze the cable force during the construction stage of the cable-stayed bridge;the results show that the cable force calculated using the difference method can meet the construction requirements after ten iterations;there is a coupling relationship between the cable forces of the stay cables,and the closer the distance to the changing cable force,the greater the impact on the stay cables;before the secondary tensioning,the steel beams have been fully spliced,resulting in a smaller impact of different construction methods on the secondary tensioning force of the cables,indicating that the internal force changes of the steel beams are more sensitive to the cable force.