城市轨道交通桥上梯形枕轨道纵向力研究

Study on Longitudinal Force of Ladder-shaped Sleeper Track on Urban Rail Transit Bridge

以往线桥模型计算无砟轨道纵向力时,是将线路纵向阻力简化为扣件纵向阻力,这与桥上梯形枕轨道实际工况有很大出入。文章在前人研究的基础上,建立了考虑凸型挡台胶垫及弹性支承的轨-梯形枕-桥纵向一体化力学模型,以一城市轨道交通5×30 m双线箱型梁桥为例,对其进行纵向力分析,并与传统的线桥模型进行对比,结果表明,凸型挡台及弹性支承的影响不可忽略。

Former line bridge model simplifies line longitudinal resistance to fastener longitudinal force in calculation of longitudinal force of ballastless track,which is largely different from the actual situation of trapezoidal sleeper track.On the basis of the former research,this paper establishes an integral mechanical model of track-ladder sleeper-bridge longitudinal force considering convex block cushion and elastic support.Based on a 5×30 m urban rail transit double-track box-girder bridge,this paper analyzes its longitudinal force and compares it to traditional line bridge model.The result shows that the influence of convex block and elastic support cannot be ignored.