高速铁路桥上无缝线路纵向附加力研究

Study on the Additional Longitudinal Forces Transmission between Continuously Welded Rails and High-Speed Railway Bridges

采用实体单元模拟桥梁及桥梁墩台、空间梁单元模拟钢轨、弹簧单元模拟桥梁与墩台及轨道之间的连接,建立梁—轨纵向相互作用三维有限元空间力学模型。以丰沙线永定河单线铁路桥梁、秦沈线沙河双线铁路桥梁对其进行计算验证。以秦沈客运专线32 m多跨双线整孔简支箱型梁桥为例进行纵向力分析,研究结果表明:列车在桥上双线对开,钢轨挠曲附加力有明显增大;列车在桥上单线制动,四根钢轨的制动附加力有较大的差别;列车在桥上双线对向制动,相比单线制动,钢轨制动附加力有一定程度增大,但增大得并不多。

A three-dimensional finite element spatial mechanics model for calculating the additional longitudinal force transmission between continuously welded rails and high-speed railway bridges is established by using solid element to simulate bridges as well as pier and abutment, using space beam element to simulate rails, using spring element to simulate the link between bridges and tracks as well as pier and abutment. By using the experimental results of Yongdinghe single-track railway bridge on Fengtai-Shacheng railway as well as the results of Shahe double-track railway bridge on Qinhuangdao Shenyang railway , the au thor verifies the model. Furthermore, taking a multi-span 32 m simple supported double-track box girder on Qinhuangdao-Shenyang passenger special line as an example, the author made a study on the additional longitudinal force caused by different load cases with the model. The calculation results show that. the winding additional longitudinal force increases significantly when two trains pass the bridge with the opposite direction; the rail braking additional longitudinal forces of four rails are of some discrepancy, when only one train passes the bridge; comparison with the load case of only one train braking on the bridge, when two trains brake on the bridge with the opposite direction, the rail braking additional longitudinal force increases, but the increase is slight.