时速400 km高速铁路桥梁列车横向摇摆力研究

Lateral Swaying Force of 400 km/h High-Speed Train Running on Bridges

为研究时速400 km高速铁路桥梁的列车横向摇摆力,通过车桥耦合振动方法,采用时速400 km高速动车组列车参数,分析了列车通过不同跨度桥梁的横向摇摆力,讨论车速、载重等因素的影响,基于CFD模拟计算了列车和桥梁的气动特性,考查侧向风对横向摇摆力的影响。结果表明:满载时的横向摇摆力较空载大,车速大于400 km/h后横向摇摆力变化较小;列车相邻四轴横向摇摆力的相关性较弱,车速400 km/h时,按相邻四轴时程曲线叠加的最大值和4倍标准差法得到的横向摇摆力接近;考虑25 m/s侧向风的影响后,相邻四轴横向摇摆力为114 kN。建议进行桥梁结构验算时横向摇摆力取为80 kN,但有横向风时需进行风-车-桥分析。

To investigate the lateral swaying force of high-speed train running on bridge at the speed of 400 km/h,the vehicle-bridge coupled vibration method is used to analyze the lateral swaying force of trains passing through bridges of different spans based on the parameters of 400 km/h high-speed train,and discuss the influence of factors,such as vehicle speed and train load.The aerodynamic characteristics of vehicle-bridge system are calculated based on CFD,and the influence of lateral wind on lateral swaying force is investigated.The results show that the lateral swaying force under full load is greater than that under no-load,and the change in lateral swaying force is small when the vehicle speed is greater than 400 km/h.The correlation between the lateral swaying force of the adjacent four axles of the train is weak,and when vehicle speed is 400 km/h,the maximum value of the time-history curves superimposed on the adjacent four axes is close to the lateral swaying force obtained by the four-fold standard deviation method.Considering the effect of lateral wind of 25 m/s,the lateral swaying force of the adjacent four axes is 114 kN.It is suggested that the lateral swaying force should be taken as 80 kN in bridge structure checking,but wind-vehicle-bridge analysis should be conducted,if subjected to lateral wind.