斜拉桥抖振时域分析实用方法

Practical method of buffeting analysis in time domain for cable-stayed bridge

基于模态综合理论提出一种斜拉桥抖振时域分析实用方法.在桥梁随机风场数值模拟的基础上,建立斜拉桥时域抖振分析计算模型.该方法简化了自激力时域化过程,并在计算中考虑了气动刚度、气动阻尼和气动耦合作用对结构响应的影响,提高了斜拉桥抖振时域分析的效率.通过对一座大跨斜拉桥的抖振时域分析,验证方法的正确性和可行性.

A practical method of buffeting analysis in time domain for cable-stayed bridges was presented based on the mode integration theory. Analysis and computation model of time domain buffeting of cablestayed bridge was built up on the basis of numerically simulating the stochastic wind field around the bridge. Using this toothed, the process of transformation of self-excited force into time domain was simplified, and the influence of aerodynamic stiffness, aerodynamic damping and aerodynamic coupling on structure response was considered, so that the computation efficiency of buffeting analysis for cable-stayed bridge was improved. By applying this method to a large-span cable-stayed bridge, the validity and feasibility of this method was verified.