温度梯度荷载作用下CRTSⅡ型轨道板变形差异分析  

Analysis of Deformation Difference of CRTSⅡ Track Slab under Temperature Gradient Load

作　　者：许振楠 卜建清[2] 张吉仁 XU Zhennan;BU Jianqing;ZHANG Jiren(Hebei Key Laboratory of Traffic Safety and Control CCECC Fuzhou Survey&Design Institute Co.,Ltd.,Fuzhou 350013,China;Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]中土集团福州勘察设计研究院有限公司,福州350013 [2]石家庄铁道大学,石家庄050043

出　　处：《高速铁路技术》2020年第4期65-69,共5页High Speed Railway Technology

摘　　要：为探究线性与非线性温度梯度荷载作用下无砟轨道CRTSⅡ型轨道板的变形差异,分析该变形差异与地区气候温度之间的关系,同时验证不同地区非线性温度梯度分布适用公式的准确性,本文选取3个不同地区的无砟轨道板作为研究对象,通过ANSYS有限元分析软件建立CRTSⅡ型板式结构的三维有限元模型。温度数据分别取线性温度梯度计算数据、地区非线性温度梯度分布适用公式计算数据和地区轨道板实测温度数据,并将其转化为模型温度荷载进行模拟计算。研究结果表明,线性和非线性温度梯度荷载作用下,轨道板的变形存在差异,且差异与轨道结构所处的地区有关。轨道结构所处地区气温越高,即轨道板顶面温度越高,轨道板变形的差异越小。In order to explore the deformation difference of CRTSⅡ slab of ballastless track under linear and nonlinear temperature gradient loads, analyze the relationship between the deformation difference and regional climate temperature, and verify the accuracy of the applicable formula of nonlinear temperature gradient distribution in different regions, this paper selects three ballastless track slabs in different regions as research objects, and establishes the three-dimensional finite element model of CRTSⅡ slab structure using ANSYS finite element analysis software. The temperature data include linear temperature gradient calculation data, applicable formula calculation data of regional nonlinear temperature gradient distribution and measured temperature data of regional track slab, which are converted into model temperature load for simulation calculation. The results show that there are differences in the deformation of track slab under linear and nonlinear temperature gradient loads, and the differences are related to the location of track structure. The higher the air temperature in the area where the track structure is located, that is, the higher the top surface temperature of the track slab, the smaller the difference of track slab deformation.

关 键 词：高速铁路 非线性 温度梯度 模型试验 轨道板 温度变形 

分 类 号：U213.242[交通运输工程—道路与铁道工程]