斜拉桥在考虑风效应时的车-桥耦合振动

Coupled Vibration of Train and Cable-Stayed Bridges with the Effects of Wind

以芜湖长江大桥为算例，考虑风荷载作用于列车和桥梁上，对ＩＣＥ高速列车以２００ ｋｍ／ｈ的速度通过桥梁时，计算了与列车运行安全性及旅客乘座舒适度相关的指标。风荷载考虑为脉动的，按Ｓｉｍｉｕ谱用 Ｍｏｎｔｅ Ｃａｒｌｏ法模拟脉动风速，结合由风洞试验测定的空气动力参数，计算了作用于列车和桥梁上的自然风荷载。根据结构动力学理论，建立了机车（车辆）的动力学方程；建立了桥梁的有限元振动方程；桥上轨道不平顺按６级线路（最好的线路）模拟。计算结果表明，对芜湖长江大桥，桥上允许行车的桥面处横桥向最大风速应小于３０ ｍ／ｓ。

In this paper, the train safety and riding comfort of passengers are analyzed, by taking Wuhu Bridge over the Yangtze River as an example and wind load on trains and the bridge into consideration. Wind loading is considered to be fluctuating, the speed of which is simulated with Monte Carlo method according to Simiu spectrum.Combined with the aerodynamic parameters of the bridge and trains measured by wind tunnel tests, the natural wind load acting on the bridge and trains is simulated. Dynamic equations of locomotives and cars are established according to the theory of structural dynamics. Vibration equations for the bridge are derived using spatial beam element. Track irregularity is simulated with a grade 6 (the best of the specification).The simulation results show that the maximum wind speed is less than 30 m/s for a train to run safely through the Wuhu bridge.