风荷载-列车-大跨度桥梁系统非线性耦合振动分析

考虑桥梁结构的几何非线性因素,建立了风-列车-桥梁系统耦合振动分析模型.以某大跨度钢桁梁桥为例,计算了静风及脉动风荷载的不同作用效应、风速及车速变化对桥梁位移极值的影响及桥梁几何非线性因素对结构分析的影响.结果表明,进行车桥耦合振动分析时要综合考虑风荷载的动力作用,风速及车速变化对桥梁位移极值均有较大影响,桥梁的线性及非线性位移时程曲线存在明显区别.

Nonlinear coupling vibration analysis of wind load-train-long-span bridge system

Taking into account the geometric nonlinearity of bridge structure, the dynamic analysis model for bridge under train and wind action is established. A long-span continuous steel truss bridge is taken for an example, the acting effects of static wind and buffeting wind as well as the influence of wind velocity and train speed, and the effect of geometric nonlinearity are analyzed. The results show that the wind loads should be considered synthetically in analyzing the train and bridge system, both wind velocity and train-speed have great influence on the maximum deflection of the bridge, and the linear and nonlinear displacement time curves are different obviously.