考虑铺装层厚度的钢-混组合桥面系竖向温度梯度研究  

Study on Vertical Temperature Gradient of Steel-composite Bridge Deck System Considering the Thickness of Pavement Layer

作　　者：梁茜雪 王祺顺 张祖军 LIANG Qianxue;WANG Qishun;ZHANG Zujun(Guangxi Transportation Science and Technology Group Co.,Ltd,Nanning,Guangxi 530007,China;Hunan Transportation Research Institute Co.,Ltd.Changsha,Hunan 410015,China;School of Civil Engineering,Changsha University of Science and Technology,Changsha,Hunan 410015,China)

机构地区：[1]广西交科集团有限公司,广西南宁530007 [2]湖南省交通科学研究院有限公司,湖南长沙410015 [3]长沙理工大学土木工程学院,湖南长沙410015

出　　处：《公路工程》2021年第3期105-111,164,共8页Highway Engineering

基　　金：南宁市创新创业领军人才“邕江计划”创新项目(2018-01-04);国家重点基础研究发展计划(973计划)项目(2015CB057705)。

摘　　要：首先基于热传递理论,采用实测数据标定数值仿真模型,实现钢-混组合桥面系竖向温度梯度的精细化模拟;计算最大竖向温差下的温度梯度,并与实测结果及规范进行比对分析;最后对比了不同厚度铺装层下结构竖向温度梯度的差异,给出了考虑铺装层厚度的钢-混组合桥面系竖向温度梯度拟合曲线。结果表明,数值模型可以精确模拟日照温度场下结构竖向温度梯度分布,最大竖向温差下结构竖向温度梯度曲线与现行规范基本一致;铺装层及混凝土桥面板存在温度峰值滞后于环境温度的特点,钢梁则基本不存在峰值滞后;高温时间段不同厚度铺装层温度极值相差可达11.2℃,低温时段可达-1.1℃;采用分段函数对竖向温度梯度拟合,精度较高,与数值计算结果相差±1℃左右,但与现行规范钢梁温度梯度相差可达2.6℃,实际工程应考虑结构特征对竖向温度梯度进行修正。Based on the measured data and the numerical simulation method,the research is carried out in this paper.Firstly,based on the heat transfer theory,the numerical simulation model was calibrated with measured data to achieve the fine simulation of vertical temperature gradient of steel-concrete composite bridge deck system.The temperature gradient under the maximum vertical temperature difference was calculated and compared with the measured results and specifications.Finally,the difference of vertical temperature gradient under different thickness of pavement is compared,and the fitting curve of vertical temperature gradient of steel-concrete composite bridge deck system considering the thickness of pavement is given.The results how that the numerical model can accurately simulate the vertical temperature gradient distribution of the structure under the sunshine temperature field,and the vertical temperature gradient curve of the structure under the maximum vertical temperature difference is basically consistent with the current code.The peak temperature of pavement and concrete bridge deck lags behind the ambient temperature,while the peak temperature of steel beam does not.In high temperature period,the maximum temperature difference of pavement layer with different thickness can reach 11.2℃,and in low temperature period,it can reach-1.1℃.The vertical temperature gradient is fitted with a segmenting function,and the accuracy is high.The difference from the numerical calculation is±1℃,but the difference from the current standard steel beam temperature gradient can be up to 2.6℃.The vertical temperature gradient should be corrected in practical engineering considering the structural characteristics.

关 键 词：桥梁工程 钢混组合桥面系 竖向温度梯度 铺装层 有限元 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]