无铺装钢轨道梁日照温度场研究  

Research on Sunshine Temperature Field of the Unpaved Track Steel Girder

作　　者：黎泰良 LI Tailiang(China Railway Siyuan Group Southwest Survey and Design Co.Ltd.,Kunming Yunnan 650200,China)

机构地区：[1]中铁四院集团西南勘察设计有限公司,云南昆明650200

出　　处：《铁道建筑技术》2022年第6期19-22,32,共5页Railway Construction Technology

基　　金：中铁第四勘察设计院集团有限公司科技课题研究项目(2020K146)。

摘　　要：不均匀日照温度场会使钢轨道梁产生较为复杂的应力和变形,从而影响结构安全性和行车舒适性,本文对日照温度场影响因素进行研究。通过对无铺装轨道钢箱梁足尺试验模型三个月的温度监测,选取温度梯度最为显著的五个测量日数据进行分析,推断出最大温度梯度出现在12:00~16:00时间段内,且位于全天均被翼缘板遮挡的腹板上。对所有测量日中最大温差接近19.5℃的数据组进行拟合,得到无铺装钢轨道梁的最大温度梯度曲线,并采用有限元软件建立模型得出不同时刻各腹板的计算温度梯度曲线。将计算温度梯度曲线与实测温度梯度曲线进行对比分析,两者吻合度良好。通过敏感性分析,发现对最大温度梯度影响最为显著的参数为太阳辐射吸收率,其次为翼缘板长度及日平均风速。Nonuniform sunlight temperature field can cause complicate stress and deformation in track steel girder,affecting structure safety and driving comfortability.The influencing factors of the nonuniform sunlight temperature field were studied in the paper.Through three-month temperature monitoring on full-scale test model,data of five days with the most significant temperature gradient was used for analysis,the maximum temperature gradient was found to occur on the web covered by the flange all day long during 12:00 to 16:00.The maximum temperature gradient curve of the unpaved track steel girder was fitted with the measured data with the maximum temperature gradient close to 19.5 ℃.The model was developed in finite element analysis software to get calculated temperature gradient curves of each web at different times.By comparing the calculated temperature curves with that measured,good matching was found.It was found that the solar radiation absorption rate was the most significant parameter followed by the length of the flange slab and the daily average wind speed by sensitivity analysis.

关 键 词：无铺装钢轨道梁 温度实测 温度场 有限元法 敏感性分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U482.1[交通运输工程—道路与铁道工程] U443.3