彭溪河特大斜拉桥风致颤振分析

Wind-Excited Flutter Analysis of Cable-Stayed Bridge with Long Span of Pengxi River

针对风荷载对斜拉桥作用敏感的特点,结合振动型态特性,探讨了风致颤振机理及分析方法.在此基础上,以彭溪河特大斜拉桥为例,考虑结构几何非线性影响,使用大型桥梁专业软件M IDAS,建立了符合动力特点的空间模型,对成桥、施工危险状态进行了动力特性分析,据此评估了该桥的抗风性能,为大跨斜拉桥抗风设计及动力稳定分析提供参考依据。

Focusing on the sensitivity of wind load action on cable-stayed bridge, investigated the mechanism and analytical method of wind-excited flutter. On the basis of that, taking the Pengxi river cable-stayed bridge with long span as an example, a proper dynamic calculation model was established by using the professional software of MIDAS and with geometric nonlinear consideration. According to the dynamic behavior at both construction and completion stage, the wind-resistant behavior of the bridge was evaluated. These results provide reference for the design of wind-resistant and the analysis of dynamic stability.