地铁高架轻质U梁对轮轨系统动态响应的影响分析

Infl uence of light U-beam bridge on dynamic response of wheel-rail system in metro

以深圳地铁6号线为工程背景,研究轻质U梁条件下轮轨系统动态响应特性。通过建立“车-线-桥/隧”耦合系统动力学模型,仿真计算不同轨下基础类型、桥梁跨度条件下车辆运行稳定性、平稳性及轨道动态几何状态指标,结果表明:轨下基础型式对车辆稳定性影响较小;相对于隧道基础,轻质U梁条件下车辆垂向、横向平稳性指标分别增大46.8%、65.5%,轨道动态几何状态指标中高低不平顺、轨向不平顺及轨道不平顺质量指数(TQI)指标分别增大106.6%、35.2%、18.7%;U梁跨度越大,轮轨动态响应指标越趋于不利。

Based on the engineering background of Shenzhen metro line 6,the dynamic characteristics of wheelrail system under the light U-beam bridge are studied.A vehicle-line-bridge/tunnel spatial coupling dynamic model are established,and then the dynamic response of the wheelrail system and dynamic track irregularities under different track foundation,different bridge spans are obtained by using the established model.The results show that different track foundations have little influence on vehicle stability,and compared with the tunnel foundation,the vertical and lateral stability indexes of the vehicle under the condition of light U-beam bridge are increased by 46.8%and 65.5%respectively,the track longitudinal and gauge irregularities,as well TQI indexes of the track are increased by 106.6%,35.2%and 18.7%respectively.The larger bridge span,the worse dynamic response of wheel-rail system will be.