模态综合理论在斜拉桥抖振时域分析中的应用

Mode integration method applied to buffeting analysis in time domain for cable-stayed bridge

在桥梁随机风场数值模拟的基础上,提出一种斜拉桥抖振时域分析的模态综合方法,建立了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,并在计算中全面考虑了气动阻尼、气动刚度和气动耦合作用的影响,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,验证了方法的正确性和可行性。

A buffeting analysis method for cable-stayed bridges is presented based on the mode integration theory. Compute model and process of buffeting analysis in time is built up after complete simulating stochastic wind field of bridge. In the mothed, the process of transforming self-excited force into time domain is simpled, the influence of aerodynamic stiffness, aerodynamic damping and aerodynamic coupling on struction response is considered. The method improve computing efficiency of cable-stayed bridge buffeting analysis. By applying the method on a large span cable-stayed bridge,the vahdity and feasibility of method get confirmed.