简支梁桥上CRTSⅠ型板式无砟轨道轨道板纵向力分析

Longitudinal Force Analysis on Slab of CRTSⅠ Slab Ballastless Track on Simply Supported Girder Bridge

针对我国客运专线广泛应用的CRTS I型板式无砟轨道结构,建立简支梁桥上实体计算模型,分析了轨道板纵向受力特性。计算结果表明,轨道板纵向力呈波动状分布,沿线路纵向变化明显,且不同纵向力的极值出现在桥跨不同位置。温度荷载对轨道板纵向力影响较大,应作为其设计和检算的控制因素。

Aimed at CRTS Ⅰ slab ballastless track structure widely used on PDL in our country, the calculation model for the objective on simply supported girder bridge is established to analyze the features of the longitudinal force on the slab. The calculating result shows that the longitudinal force on the slab presents wave-like distribution and the longitudinal changes along the line is obvious with the extreme values of different longitudinal forces occurred at the different positions of the bridge span. Temperature load has large influence on the longitudinal force on the slab, which shall be the factor controlling the design and calculation thereof.