桥上纵连板式无砟轨道挠曲力计算分析

根据桥上纵连板式无砟轨道的结构特点,基于有限元方法建立桥上纵连板式无砟轨道挠曲计算模型,计算温度荷载下的挠曲力,分析列车荷载作用长度、活载入桥方式对挠曲力的影响,研究桥上纵连板式无砟轨道在挠曲力作用下的梁轨相互作用规律。结果表明:桥梁挠曲变形所引起的钢轨纵向附加力较小,其中简支梁桥上钢轨挠曲附加力不超过21.6 kN,连续梁桥上钢轨挠曲附加力不超过24.0 kN;在进行部件的受力检算时,应根据具体的部件选用伸缩力或挠曲力;与桥上有砟轨道及单元板式无砟轨道有较大不同的是,还需要根据不同的检算部件寻求最不利的挠曲力列车荷载加载方式;建议采用活动端迎车进行加载。

Analysis and Calculation of Deflection Force of Longitudinally Connected Ballastless Track on Bridge

According to the structural characteristics of longitudinally connected ballastless track on bridge,this paper calculates the deflection force under temperature load,analyses the influence of train load action length and live load mode to bridge on the deflection force and studies beam-track interaction rules under deflection force of longitudinally connected ballastless track on bridges based on the model established with finite element method for the calculation of deflection force of longitudinally connected ballastless track on bridges. The results show that the additional longitudinal forces of rail caused by the flexure deformation of bridges are relatively small; the additional longitudinal forces of rail on simple supported beam bridge are no more than 21. 6kN; the additional longitudinal forces of rail on continuous bridge are no more than 24. 0kN. In the stress calculation of components,the expansion and contraction force or deflection force should be selected according to the specific component. Due to the big differences with ballast track and unit slab non-ballast track on bridges,it is also needed to find the most unfavorable train loading mode of deflection force according to different test components. It is suggested that loading is conducted on the active side to the bridge.