基于LS-DYNA的城际高速铁路高架线路等速双向会车动力响应分析

基于LS-DYNA大型有限元仿真平台,建立了城际高速铁路高架线路双向会车动力学模型,通过测试数据对模型进行初步验证,在此基础上开展了等速交汇下的高架线路动力响应特点及规律的分析计算。计算结果表明:单向行车和双向会车对由高架线路振动引起的列车运行舒适度影响不大;在速度为100～500 km/h范围等速双向会车时桥梁跨中垂向挠度大于单向行车时的1.6～2.3倍,且在150 km/h和300 km/h出现了峰值,跨中横向挠度只有单向行车时1/2～4/5,且在400 km/h出现了峰值;2列车交会时轮重减载率略大于单向行车时减载率,而脱轨系数在大部分速度区段明显小于单向行车时脱轨系数。

Dynamic response analysis of intercity high-speed railway bridge under crossing of two trains based on LS-DYNA

Based on LS-DYNA software,a dynamic three-dimensional finite element model of intercity high-speed railway under crossing of two trains was developed and validated using the measure data.As a case study,dynamic response of bridge during two trains passage was calculated.The results show that the vibration induced by the crossing of two trains running does not seriously affect the comfort of the passagers.The mid-span vertical deflection of the bridge under crossing of two trains is 1.6-2.3 times of that induced by a single train running at 100-500 km/h speed,and resonance peaks occur at 150 km/h and 300 km/h.The mid-span lateral deflection of the bridge is only 1/2-4/5 of that induced by a single train running at 100-500 km/h speed,and resonance peak occurs at 400 km/h.The axle load decrement ratio under crossing of two trains is larger than that under a single train running,but the derailment ratio is less than that under a single train running at 100-500 km/h speed.