混凝土箱梁桥的温度场分析  

Temperature Variation of Concrete Box Girder Bridge

作　　者：汪剑[1] 方志[1] 

机构地区：[1]湖南大学土木工程学院

出　　处：《湖南大学学报（自然科学版）》2008年第4期23-28,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50678063)

摘　　要：基于混凝土箱梁桥温度场及其变化规律的理论分析和现场实测,分析了混凝土箱梁温度场与其所处的环境温度及日照辐射等因素的关系.运用辐射换热、对流换热等相关理论,对箱梁表面的各种热流进行分析,并将各种热流转换成易于加载的对流换热形式,即采用综合对流换热系数和综合大气温度来反应箱梁表面各种热流,在此基础上应用有限元方法对箱梁温度场进行计算,获得了太阳辐射作用下箱梁温度场的分布规律,并与试验结果进行了比较,其理论值与实测值基本吻合.On the basis of theoretical analysis and the measurement on site, the temperature gradients and its variation on concrete box girder bridges resulting from ambient temperature, solar radiation and structural temperature fields were discussed. With the help of the heat transfer theory and FEM, the heat flux of the surface of the concrete box girder was carried out and all the heat fluxes were described as the convection. The results were compared with that from field measurements, and a good correlation was found. It was revealed that the methods, the parameters, and the boundary condition used in this paper were reasonable. Lastly, some conclusions were obtained, which could provide the basis for box girder design under solar radiation.

关 键 词：混凝土箱梁 日照辐射 对流换热 有限元 温度场 

分 类 号：U441[建筑科学—桥梁与隧道工程]