斜拉桥主塔竖转结构受力特征分析

Analysis on Mechanics Characteristics of Vertical Rotating Structure for Main Pylon of Cable-stayed Bridge

为研究斜拉桥主塔“卧拼竖转”工艺对结构受力的影响,通过有限元全过程仿真分析,对竖转结构的应力、索力、变形及稳定性进行计算。结果表明,竖转过程中,结构最不利受力状态为主塔刚脱离胎架阶段,此状态下结构应力、索力及变形较大,结构稳定安全系数较小,施工过程中应加强对此阶段的结构监控。

In order to research the influence of the "horizontal assembly and vertical rotation" process of the main pylon of cable-stayed bridge on the structural stress, through the full-process simulation analysis of finite element, the stress, cable force, deformation and stability of vertical rotating structure are calculated. The results show that the most unfavorable stress state of the structure is the stage when the main pylon is just out of the tire frame. In this state, the structural stress, cable force and deformation are much large, and the structural stability safety factor is relatively small. The structural monitoring at this stage shall be strengthened during the construction process.