基于实测数据的高海拔大日温差地区拱上组合梁桥-无砟轨道体系温度场研究  

Thermal Field of Composite Girder-Ballastless Track System on Arch in Plateau and Regions with Large Diurnal Temperature Variation Based on Measured Data

作　　者：勾红叶[1] 陈子豪 刘畅 肖畅 袁蔚[3] 苏延文 GOU Hongye;CHEN Zihao;LIU Chang;XIAO Chang;YUAN Wei;SU Yanwen(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430061,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Standards and Certification Department,China Railway Society,Beijing 100844,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中铁第四勘察设计院集团有限公司,湖北武汉430061 [3]中铁二院工程集团有限责任公司,四川成都610031 [4]中国铁道学会标准与认证部,北京100844 [5]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《铁道学报》2024年第2期159-170,共12页Journal of the China Railway Society

基　　金：国家自然科学基金(52172374);四川省杰出青年科技人才项目(2022JDJQ0016)。

摘　　要：温度作用是影响桥梁-轨道结构服役性能的重要因素之一。为探究高海拔大日温差地区拱上组合梁桥-无砟轨道体系的温度场变化规律,基于某拟建铁路上承式大跨拱桥桥址处的环境温度持续监测数据与卫星反演得到的太阳辐射数据,建立了考虑太阳辐射阴影遮挡效应的拱上组合梁桥-无砟轨道体系温度场模型,重点分析日温度变化规律和竖向温差分布规律,获得了考虑实测气温和太阳辐射逐时变化的全年日温度场;采用广义帕累托分布对竖向温差样本进行了极值分布估计,确定不同超越概率的竖向温差代表值,提出多折线形式的竖向温度梯度模式。研究结果表明,梯度相较于平原地区更为显著,无砟轨道的遮挡效应使得温度梯度分布上移,钢梁外侧腹板在冬季产生局部梯度作用;基于实测数据的温差极值估计方法考虑了环境温度和太阳辐射对结构温度场的随机影响,可为特殊地区桥梁设计阶段温度作用的计算提供参考。Thermal action is one of the key factors affecting the service performance of bridge-track structures.To investigate the temperature field variation regularities of the composite girder-ballastless track system on arch,which is in plateau and regions with large diurnal temperature variation,based on the solar radiation data retrieved by satellite data and sustained temperature monitoring data of a proposed long-span railway deck arch bridge,a temperature field model of the composite girder-ballastless track system was established containing the shading effect of solar radiation,with a focus on the analysis of the diurnal temperature variation and vertical temperature distribution.The annual daily-temperature field simulation results were obtained considering the measured temperature and the hourly variation of solar radiation.The generalized Pareto distribution was used to estimate the extreme distribution of the maximum samples in the results.With the determination of the representative values of vertical temperature differences with diverse exceedance probabilities,the vertical temperature gradient mode with polyline was proposed.The results show that the gradient in this paper is more significant than that in the plain area.The shading effect of the ballastless track causes the temperature gradient of the system to shift upwards,resulting in local gradient effects on the lateral web of the outside steel beam in winter.The stochastic effects of ambient temperature and solar radiation on the structural temperature field obtained from the measured data are included in the extreme temperature difference estimation method,which can provide reference for the calculation of temperature actions in the design stage of bridges in special areas.

关 键 词：组合梁桥-无砟轨道体系 温度场 阴影遮挡效应 竖向温度梯度 广义帕累托分布 

分 类 号：U24[交通运输工程—道路与铁道工程]