重载铁路桥上无砟轨道动力学选型研究

为给孟加拉帕德玛大桥铁路连接线桥上无砟轨道结构选型提供依据,基于车辆-轨道耦合动力学理论,建立重载货车-无砟轨道-桥梁耦合动力学模型,分析不同轴重货车通过桥上不同类型无砟轨道时的动力响应。结果表明:随着列车轴重的增大,桥上无砟轨道部件的动力响应明显增大;从降低轨道结构位移的角度考虑,优先选取现浇板式无砟轨道和单层长枕埋入式无砟轨道等单层无砟轨道结构;从降低轨道与桥梁的接触应力及桥梁振动加速度的角度考虑,应优先选取单元板式无砟轨道和长枕埋入式无砟轨道等双层无砟轨道结构。重载铁路桥上无砟轨道选型应综合考虑桥上无砟轨道的动力特性、线路特点及其与相关专业的接口等因素综合确定,相关成果可为重载铁路桥上无砟轨道选型提供参考。

Study on Dynamics Selection of Ballastless Track on Heavy-haul Railway Bridge

In order to provide a basis for the structural type selection of ballastless track on the railway connecting line on Bangladesh Padma Bridge,a coupled dynamic model of heavy-haul truck-ballastless track-bridge is established based on the theory of vehicle-track coupling dynamics and the dynamic responses of the freight trains with different axle loads on different ballastless tracks are compared and analyzed.The results show that with the increase of train axle load,the dynamic response of ballastless track on the bridge is increased obviously.To reduce track displacement,single layer ballastless track such as cast-in-place slab ballastless track and single layer long sleeper buried ballastless track is prioritized.To reduce the contact stress between track and bridge,and reduce the vibration acceleration of the bridge,double layer ballastless track such as the unit slab track and the long sleeper buried ballastless track should be prioritized.The selection of the ballastless track on heavy-haul railway bridge should synthetically take into consideration of the dynamic characteristics of ballastless track on the bridge,line characteristics and the interfaces with related specialties.The related results can provide reference for the selection of ballastless track on heavy-haul railway bridge.