城际铁路桥上纵向承台式无砟轨道扣件系统关键参数研究

为研究城际铁路纵向承台式无砟轨道扣件系统关键参数取值,基于车辆-轨道耦合动力学理论,建立客车-无砟轨道-桥梁耦合动力学模型,分析扣件刚度、扣件间距对桥上无砟轨道系统动力响应的影响规律,并基于层次分析法,对桥上无砟轨道系统动力特性进行综合评价。结果表明:随着扣件系统刚度增大,钢轨垂向位移减小,车体振动加速度、轮轨垂向力、轮重减载率和桥梁振动加速度均增大;随着扣件间距的增大,轮轨垂向力减小,车体振动加速度、轮重减载率、钢轨垂向位移和桥梁振动加速度均增大;综合考虑轨道变形以及工程造价,建议扣件系统刚度为50～80 kN/mm,扣件间距为0.6～0.7 m。

Study on Key Parameters of Fastener System for Longitudinal Bearing Platform Ballastless Track on Intercity Railway Bridge

In order to determine the key parameters of ballastless track fastener system on intercity railway bridges, a coupled dynamic model of heavy-haul ballastless track bridge is established based on the theory of vehicle-track coupling dynamics, and the effects of fastener stiffness and fastener spacing on the dynamic responses of track system on bridge are analyzed. The dynamic characteristics of ballastless track system on bridge are comprehensively evaluated based on the analytic hierarchy process. The results show that the vertical displacement of rail decreases, and the vibration acceleration of vehicle, the vertical wheel rail force, the wheel load reduction and the vibration acceleration of bridge increase with the increase of fastener system stiffness. With the increase of fastener spacing, the vertical wheel rail force decreases, and the vibration acceleration of vehicle, wheel load reduction and vibration acceleration of bridge increase. Considering the displacement of track and engineering cost, it is suggested that the fastener system stiffness should be 50～80 kN/mm, the fastener spacing should be 0.6～0.7 m.