针对城市轨道交通中新应用的双线U型梁和传统的双线箱型梁两种不同型式桥梁，用有限元法计算分析桥上无缝线路附加挠曲力及附加挠曲位移的分布，着重研究线路纵向阻力、桥梁跨度和桥墩刚度等参数变化对桥上无缝线路钢轨受力、桥墩受力及桥梁挠度等方面的影响。研究结果表明，线路纵向阻力、桥梁跨度对钢轨挠曲力的影响较大，而桥墩纵向刚度对钢轨挠曲力的影响较小，为城市轨道交通设计提供理论参考依据。

Two types of urban rail transit double-track bridges are considered including the new type U-beam bridge and the traditional type box-girder bridge． The additional flexural forces and displacement distribution in CWR on the bridges have been calculated by finite element method． This paper carried out a detailed analysis on the flexural forces in tracks，the pier forces and bridge deflections owing to the changes in the longitudinal resistance，bridge spans and pier stiffness． Results showed that longitudinal resistance，bridge spans affect the rail additional flexural forces to a larger extent and the pier stiffness less affects the rail additional flexural forces． These results can provide a theoretical basis for the design of urban rail transit bridges．