大跨度悬索桥梁端竖向折角对列车走行性的影响研究

大跨度桥梁较为柔性,易产生梁端竖向折角,过大的梁端竖向折角会影响列车的安全性和舒适性。有代表性地选取较为柔性的大跨度公轨两用悬索桥作为工程背景,基于车-桥耦合动力仿真数值计算方法,采用自主研发的桥梁科研分析软件BANSYS(Bridge ANalysis SYStem),分析列车进桥及出桥全过程中车辆和桥梁的响应,对比不同车辆运行方式、不同车速、不同车载状态下的响应,讨论大跨度悬索桥梁端竖向折角对列车走行性的影响,进一步提出减小梁端竖向折角的措施。研究结论对大跨度轨道交通桥梁的运营安全具有指导意义。

Effects of vertical rotation angle at girder ends on train running performance for large-span suspension bridges

Vertical rotation angle may appear at girder ends more easily for large-span bridges due to long spans and flexibility.The oversize rotation angle could affect traffic safety and comfortability.Large-span rail-road suspension bridges,relatively flexible,have been typically selected for case studies.Based on the numerical simulation for coupling vibration of rail vehicle-bridge systems,the software BANSYS(Bridge ANalysis SYStem) was adopted for calculating the responses of the vehicles and the bridge in the process of a train passing through bridge.For different types of traveling,velocities and vehicle load states,the responses of the train and the bridge are analyzed.The effects of vertical rotation angle at girder ends of large-span suspension bridges on train running performance are investigated.The measures to decrease vertical rotation angle are presented.The conclusions can provide a guideline for the traffic safety of large-span rail transit bridges.