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该文介绍了多塔斜拉桥施工过程中的稳定性分析方法。根据多塔斜拉桥的受力特点,采用有限元方法对斜拉桥的施工阶段进行模拟,对其中3个重要的施工阶段分别进行了弹性和弹塑性稳定分析。分析结果表明:某大桥的稳定安全系数满足规范的规定,横向和纵向风荷载在施工过程中对结构的稳定性影响不大,在考虑几何非线性和材料非线性后,结构的稳定安全系数显著降低,此影响不容忽视,需要加强施工阶段对称平衡安装的控制,确保桥梁施工的稳定性。
This paper introduces the stability analysis method of multi-tower cable-stayed bridge during construction. According to the mechanical characteristics of the multi-tower cable-stayed bridge, the finite element method is used to simulate the construction stage of the cable-stayed bridge, and the elastic and elasto-plastic stability analysis of the three important construction stages is carried out respectively. The analysis results show that the stability safety coefficient of a bridge meets the requirements of the code. The transverse and longitudinal wind loads have little effect on the stability of the structure during construction. The stability and safety factor of the structure is significant after considering geometric nonlinearity and material nonlinearity Reduce the impact of this can not be ignored, the need to strengthen the balanced symmetrical construction phase of the installation control to ensure the stability of the bridge construction.