中文摘要：

桥墩纵向水平线刚度是桥梁和无缝线路设计的关键技术参数,桥上无缝线路的纵向附加力、梁轨相对位移和钢轨断缝值在很大程度上取决于桥墩纵向水平刚度。基于有限元方法和梁轨相互作用原理,以铁路常见的简支梁桥为研究对象,建立线-桥-墩一体化桥上无缝线路计算模型,研究桥墩纵向水平刚度对钢轨伸缩力、挠曲力、制动力和钢轨断缝值的影响规律。结果表明:随着桥梁墩台纵向水平刚度的增大,钢轨伸缩力和挠曲力均增大,而制动力、梁轨相对位移和钢轨断缝值均减小;桥上无缝线路检算钢轨伸缩力和挠曲力时,桥墩纵向水平刚度为刚性时偏于安全;检算制动力和钢轨断缝值时,桥墩纵向水平刚度取值越小越偏于安全。

英文摘要：

The longitudinal rigidity of piers is a key parameter in the design of the bridge and CWR.The longitu-dinal additional force,relative displacement between bridge and rail,breaking joint of CWR rails depend on the longitudinal rigidity of piers to a great extent.The commonly-used simply-supported girder bridge was used as an example in this study.An integrated track -bridge -piers calculation model of CWR on bridge was estab-lished according to the finite element method and the theory of interaction between rail and bridge.The Impacts of longitudinal rigidity of piers on the rail expansion and contraction forces,bending force,braking force and rail breaking joint were analyzed.Results show that with increasing longitudinal rigidity of piers,the rail expansion and contraction forces and bending force increase,whereas the braking force,relative displacement between bridge and rail,and breaking joint of rail decrease.The greater the longitudinal rigidity of piers is,the safer it will be when calculating the rail expansion and contraction forces and bending force.The less the longitudinal ri-gidity of piers is,the safer it will be when calculating the braking force and breaking joint of rail.