高速铁路无砟轨道-桥梁系统纵向变形与轨面变形映射关系

Mapping between rail deformation and longitudinal deformation of high-speed rail ballast-less track-bridge system

以高速铁路纵连式无砟轨道和简支梁为研究对象,分析高速铁路桥梁-轨道系统(HSRTBS)层间传力机制,将HSRTBS层间构件分离,基于HSRTBS层间内力平衡条件,采用能量变分原理建立HSRTBS纵向变形与轨面映射变形求解通用模型。基于ANSYS软件建立HSRTBS有限元模型,通过对比本文解析模型求解的轨面映射变形与有限元结果,验证本文轨面映射模型的合理性及有效性,研究轨道-桥梁系统参数对轨面映射变形的影响。研究结果表明:轨面映射变形峰值与桥梁变形幅值增长线性相关;轨面映射变形随着桥梁变形幅值增大增速减缓,呈现非线性增长;轨面纵向映射变形对于层间扣件刚度变化十分敏感;滑动层刚度变化对于轨面纵向映射变形影响较小;剪切钢筋和滑动层剪力齿槽是极为重要的纵向传力构件,当二者失效时,将对轨面纵向变形产生严重影响。

The longitudinal connected ballast-less track and simply supported beam bridges on a high-speed rail were selected as the research objects.By making a comprehensive mechanical analysis of the high-speed rail trackbridge system(HSRTBS),the energy variational principle was used to establish the mapping relationship between the longitudinal bridge deformation and rail deformation based on the interlayer’s force balance requirements of HSRTBS.A finite element(FE) model of the HSRTBS was established using ANSYS software.The mapping rail deformation was validated by making comparisons to the FE model.The influence of the structural parameters of HSRTBS were further analyzed.The results indicate that the maximum mapping rail deformation increases linearly with the bridge deformation while the range of mapping rail deformation increases nonlinearly with the bridge deformation.The longitudinal mapping rail deformation is sensitive to the change of fastening stiffness.The sliding layer’s stiffness has little influence on the longitudinal mapping rail deformation;the shear bars in the CA layer and shear grooves in the sliding layer have significant influences on the longitudinal mapping rail deformation.