芜湖长江大桥斜拉桥的车桥耦合振动分析

Coupling vibration analysis of main span on Wuhu Yangtze-River Bridge

针对芜湖长江大桥主桥 180 m +312 m +180 m的斜拉桥 ,分别采用空间杆系有限元模型与空间杆系 -板-实体混合单元有限元模型分析了桥梁的空间自振特性 ,两种模型的计算结果取得了较好的一致。并采用空间杆系有限元模型 ,对该斜拉桥在列车活载和公路活载下实际运营中的车桥动力响应进行了分析 ,计算结果表明 ,尽管该斜拉桥在设计荷载 (中—活载 )下的挠跨比达 1/ 5 87,列车通过桥梁时的舒适性与安全性仍能满足要求 ,桥梁具有足够的竖向与横向刚度。

The 3D free vibration properties of the cable stayed bridge on Wuhu Yangtze River bridge, which is of 180 m+312 m+180 m span, are analyzed by space bar FEM model and also by space bar slab solid hybrid FEM model. Their results agree well to each other, The coupling vibration responses of vehicle bridge system under a running train are calculated. Results show that, though the ratio of deflection to span for bridge under design load is up to 1/587,the train can pass it safely and comfortably, and the bridge is of enough vertical and transverse stiffness.