连续梁桥上非标准板厚无砟轨道受力及变形分析

Analysis of Stress and Deformation of Non-Standard Thickness of Ballastless Track Slab on Continuous Beam Fridge

本文基于西安地铁5号线工程桥梁地段桥面标高存在超限较大或低于设计标高情况,提出了轨道结构加强措施,通过建立桥梁–轨道系统静力分析模型,分析了列车荷载、温度荷载作用下连续梁桥上全断面道床和加厚道床两种无砟轨道的受力和变形特征。研究结果表明:本文提出的轨道设计方案在解决标高问题的同时,可满足轨道结构耐久性要求,应力水平均小于混凝土抗拉强度;温度荷载作用下部分区域存在应力集中现象,施工中应严格控制道床板温度,确保施工质量。

The track structure strengthening measures were proposed based on the fact that the bridge elevation exceeded the limit or was lower than the design elevation in Xi’an Metro Line 5 project, so a static analysis model of bridge-track system was established to analyze the force and deformation characteristics of two ballastless tracks concluding full-section ballast bed and thicker ballast bed on continuous beam bridges under the train and temperature load. The research results show that the track design proposed in this paper can not only solve the elevation problem, but also meet the durability requirements of the track structure. The stress level is less than the tensile strength of concrete;there is stress concentration in some areas under the action of temperature load. The temperature of the track building should be strictly controlled to ensure the quality of construction.