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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。
In the past, when the bridge model calculated the longitudinal force of ballastless track, the longitudinal resistance of the line was simplified as the longitudinal resistance of the buckle, which was different from the actual working condition of the trapezoidal pillow orbit. Based on the previous studies, a longitudinal-integral mechanics model of rail-trapezoid pillow-bridge considering the convex stop pad and elastic support was established. Taking a 5 × 30 m double-track box girder bridge For example, the longitudinal force analysis is carried out and compared with the traditional bridge model. The results show that the influence of convex block and elastic support can not be neglected.