温度对板式无砟轨道结构的影响研究

Research on Temperature Effect on the Structure of Slab Ballastless Track

研究目的:基于传热学的基本理论,采用有限元分析法,利用大型商业软件ABAQUS对板式无砟轨道结构在温度作用下的影响进行仿真计算,分析不同基础支撑形式及不同轨道板宽度和厚度对无砟轨道结构温度效应的影响,探讨温度变化对板式无砟轨道结构的影响规律,为无砟轨道的结构设计提供依据。研究结论:(1)温差变化和结构变形并非呈现简单的线性关系,而是温度越高,变形的变化幅度越大。(2)刚性基础支撑下由于温差而引起的轨道板的温度应力远大于弹性支撑下轨道板的温度应力,但是刚性基础支撑下由于温差而引起的轨道板的最大竖向位移差则小于弹性支撑下轨道板中的情况。(3)在相同的板厚温度梯度条件下,轨道板的变形量随板厚的增加而增大,随板宽的增大而增大。

Research purposes： Based on the theory of heat transferring, with the finite - element analysis method and software ABAQUS, the simulation calculation of temperature effect on slab ballastless track is carried out and the analyses of the influences of the different supporting foundations and different width and thickness of slab on temperature effects to ballastless track are made for the purpose of providing the basis for the structure design of ballastless track. Research conclusions： （ 1 ） The relation between the change of difference in temperature and the structural transmutation is not linear. The higher the temperature is, the larger the change range of structural transmutation becomes. （2） The stresses in slab caused by difference in temperature on the rigid foundation are much bigger than that on the elastic foundation, but the slab＇s maximal difference in vertical displacement on the rigid foundation is less than that on the elastic foundation. （3） On the assumed condition of same lapse rate, the deformations in slab increase with the increase of the thickness and width of slab.