非对称独塔斜拉桥稳定性分析

Stability Study of Asymmetric Single Tower Cable-stayed Bridge

非对称独塔斜拉桥结构新颖,质量轻,主梁轴力大,稳定性问题较为明显,且其稳定性能规律不同于普通斜拉桥,因此,对非对称独塔斜拉桥的稳定性研究很有必要。以珲春大桥为主要研究背景,采用Midas/Civil有限元分析软件建立了珲春大桥空间有限元模型,对其成桥状态下线性稳定性及非线性稳定性进行分析,同时分析了结构设计参数对非对称独塔斜拉桥稳定性的影响。分析结果表明,活载对结构成桥状态第一类稳定性影响较大,斜拉索垂度效应对结构稳定性影响较小,可以忽略。斜拉索索力、恒载、斜拉索面积和主塔刚度等设计参数的变化对结构的稳定性均有不同程度的影响,在设计中需要分别考虑。

The stability problem of asymmetric single tower cable-stayed bridge is obvious with its novel structure,light quality and big girder axial force,which is different from ordinary cable-stayed bridge. Therefore,the research on the stability of the asymmetric single tower cable-stayed bridge is necessary. This paper is based on hunchun bridge,and the finite element analysis software Midas/Civil is used for Hunchun bridge space finite element model. The linear and nonlinear stability under bridge state are analysed,at the same time,the design parameters of structure on the effect about the bridge are analysed. The analysis results show that live load has greatly influence on the first kind of stability,while the cable sag effect has little effect on the stability of structure,which can be ignored. The design parameters,such as the stay cable force,dead load,cable area and the stiffness of main tower,have different impact on the stability of the structure to some extent,so we should consider in the design respectively.