塔梁交汇区风场效应及对行车安全的影响

Wind Field Effect in Tower-Girder Intersection Area and Its Influence on Driving Safety

以泉州湾跨海大桥为工程背景,采用CFD(Computational Fluid Dynamics)数值仿真方法研究在横风作用下CRH3列车通过塔梁交汇区时气动荷载的变化。基于风-车-线-桥耦合振动分析方法研究车辆的动力响应,对车辆行车安全性和乘坐舒适性作出评价。结果表明:考虑塔梁交汇区风场效应对车辆的影响后,车辆气动荷载发生突变,各项动力响应均有所增大,车体加速度变化较显著;当风速达到25 m/s时,横向加速度增大34%,竖向加速度增大41%,均超过了规范限值,桥上行车需要限制车速;在分析横风作用下高速列车的动力响应时,塔梁交汇区风场效应引起的列车气动荷载变化不容忽视。

Taking the Quanzhou Bay Bridge as the engineering background,the aerodynamic load variation of CRH3 train passing through the tower-girder intersection area under the cross wind was studied by using CFD(Computational Fluid Dynamics)numerical simulation method.Based on the wind-train-rail-bridge coupling vibration analysis method,the dynamic response of the vehicle was studied,and the driving safety and ride comfort of the vehicle were evaluated accordingly.The results show that after considering the influence of wind field effect in the tower-girder intersection area on the vehicle,the aerodynamic load of the vehicle changes abruptly,all dynamic responses increase,and the vehicle acceleration changes significantly.When the wind speed reaches 25 m/s,the transverse acceleration increases by 34%and the vertical acceleration increases by 41%,both of which exceed the limit value of the specification,and the speed of vehicles on the bridge needs to be limited.When analyzing the dynamic response of high speed train under cross wind,the change of train aerodynamic load caused by wind field effect in the tower-girder intersection area cannot be ignored.