某钢拱桥竖转施工提升塔架的非线性稳定性分析

摘要

转体施工是拱桥的一种无支架施工方法,对于大跨度拱桥的竖转施工,塔架往往较高,对高耸结构稳定性问题应给予特别的重视.以盘锦市辽东湾新区内湖中桥的竖转施工方案为工程背景,通过对转体塔架体系进行非线性屈曲的稳定性分析,分析了风荷载对高耸塔架结构稳定性的影响和侧向缆风索对增强塔架稳定性的作用.结果表明:横向风荷载对塔架稳定性影响较大,侧向缆风索可以增强塔架的稳定性.%Swivel construction is a kind of no bracket construction method for arch bridge.In particular, for vertical swivel arch construction of large-span arch bridge, the height of the tower is always very high, so we should pay more attention to the stability of the high-rise structure.This paper takes the vertical swivel construction scheme of the Zhong bridge of Liaodong Bay area in Panjin as the engineering background.Based on the analysis of the stability of nonlinear buckling of the swivel tower system, the paper analyzes the influence of wind load on the stability of the high-rise tower structure in the project.And the effect of lateral cable wind rope on the stability of the tower.The results show that lateral wind load has a great influence on the stability of tower, and lateral wind cable can enhance the stability of tower.