大跨度桥梁与无砟轨道的纵向作用力

Longitudinal Forces between Long Span Bridge and Ballastless Track

采用有限单元法建立了"钢轨—底座板—桥梁—墩台"空间一体化模型,分析了列车制动和桥梁伸缩作用下,某75 m+135 m+75 m连续梁桥与轨道的纵向作用力.结果表明:钢轨、底座板、桥梁墩台与固结机构的制动力随着连续梁上制动力作用范围增加而非线性增大,其中桥梁墩台制动力最大,达3 094.99 k N;钢轨、底座板、桥梁墩台、固结机构伸缩力均随着滑动层摩擦因素增大同步增大,其中底座板纵向力最大,达900.13 k N.

Base on finite element method（FEM）, a spatial integration mechanical model of rail-base plate- bridge-abutment is established. Longitudinal forces between a long span bridge with 75 m ＋ 135 m ＋ 75 m continuous beam and track under action of train braking and bridge expansion is analyzed. The results show that longitudinal forces on rail, base plate, bridge abutment and shear alveolar show a nonlinear increase when the area of the train braking on the continuous beam expands. Meanwhile, the maximum longitudinal force existing on bridge abutment is as large as 3 094.99 kN. When the friction factors of sliding layer in- crease, longitudinal forces on rail, base plate, bridge abutment and shear alveolar synchronously increase, among which, the maximum longitudinal force existing on base plate is as large as 900.13 kN.