上海长江大桥风-轨道车辆-桥耦合振动及抗风行车准则研究

为确定上海长江大桥轨道交通车辆的抗风行车准则,将风、车、桥三者视为一个交互作用、协调工作的耦合动力系统,通过风洞试验测定主梁及车辆的气动参数,采用自主研发的桥梁结构分析软件BANSYS进行风-车-桥耦合动力分析计算。计算结果表明:桥梁和车辆的响应随风速的增大而增大,风荷载对行车的安全性和舒适性有很大影响。当风速小于20m/s时,车辆可按设计车速90km/h运行;当风速在20～30m/s之间时,车速不应大于60km/h;当风速超过30m/s时,应封闭轨道交通。

Coupled vibration of wind-rail vehicle-bridge system for Shanghai Yangtze River Bridge and the wind-resistant criterion of running trains

Wind,rail vehicle and bridge can be regarded as a coupled vibration system.The aerodynamic coefficients of bridge deck and vehicles are measured by wind tunnel test.In order to determine the wind-resistant criterion of running trains for the Shanghai Yangtze River Bridge,the dynamic responses of the wind-vehicle-bridge system are analyzed by using a self-developed software,BANSYS.It is shown that the dynamic responses of bridge and vehicles increase with the increase of the wind velocity as well as the train speed.The train running safety and passenger ride comfort level are significantly affected by wind.When wind velocity at the deck is lower than 20m/s,the trains can safely pass the bridge at the design speed(90km/h).When the deck wind velocity equals 20～30m/s,the train can pass the bridge at no more than 60km/h.The rail traffic must be closed when the deck wind velocity is above 30m/s.