大跨度斜拉桥侧风非线性分析

Non-linear analysis for a long-span cable-stayed bridge under lateral wind loads

考虑静风荷载非线性和结构几何非线性因素的影响,计及风速沿桥梁结构高度变化,采用增量双重迭代搜索法进行了斜拉桥静风非线性稳定分析,并编制了相应的计算程序。以湛江海湾大桥为例,探讨了静风荷载非线性、风速空间分布非均匀性等因素对斜拉桥静风失稳临界速度的影响。分析结果表明,主梁扭转变形、索和塔柱上的静风载荷对斜拉桥的抗静风稳定性影响较大。

A non-linear static wind load using non-linear effect of the bridge structure, and stability ananlysis was performed for the cable-stayed bridge subjected to the the incremental double-iteration search method. The analysis considered the static wind load and the variation of the wind velocity along the he a corresponding computing program was developed. Taking the ight of the Zhanjia Haiwan Bridge as an example, the effects of the non-linearity of the static wind load and the spatial non-uniform distribution of the wind velocity on the critical static wind velocity against the stability of the cable-stayed bridge was explored. The results show that the torsional deformation of the main girder and the static wind loads on the cable and the tower affect the stability of the cable-stayed bridge against the static wind load significantly.