中文摘要：

为研究太阳辐射作用下混凝土箱梁温度场的三维分布,基于ASHRAE晴空模型,运用ANSYS软件模拟了太阳辐射作用下某混凝土箱梁的温度场,并分析了风速、大气清洁度、桥梁方位及纬度等参数对混凝土箱梁温度场的影响。研究结果表明：混凝土箱梁的温度计算值与实测数据符合较好,偏差在3℃以内,说明ASHRAE晴空模型能有效地应用于混凝土箱梁的温度场分析;混凝土箱梁的温度梯度在竖向主要集中在梗腋区域,横向集中在底板靠近腹板的区域;当腹板受到太阳直射时,底板端部区域的横向温差较大,因此在设计验算时,对翼缘悬臂相对较短的混凝土箱梁,建议考虑底板横向温差对结构的影响;风速、大气清洁度对混凝土箱梁竖向温差影响较大,而桥梁方位和纬度的影响相对较小。

英文摘要：

To research 3D temperature field of concrete box girder under solar radiation,the temperature field of a concrete box girder under solar radiation is simulated with ANSYS software based on ASHRAE clear-sky model. The influences of the main parameters,including wind speed,atmospheric cleanliness,bridge orientation and latitude,on the temperature field of the concrete box girder are analyzed. The result shows that（ 1） the calculated values of temperature are close to the measured ones and the deviation is less than3 ℃,which indicates the ASHRAE clear-sky model can be used to effectively analyze the temperature field of concrete box girder;（ 2） the temperature gradient of the concrete box girder mainly concentrates in the haunch in vertical direction,and concentrates in the area of bottom plate near web in transverse direction;（ 3） the transverse temperature difference of bottom plate end is relatively larger when the web subjected to direct sunlight,thus it is recommended that the influence of the transverse temperature difference on the structure behaviors should be taken into account for those concrete box girders with shorter flange cantilevers;（ 4） wind speed and atmospheric cleanliness greatly affect the vertical temperature difference of concrete box girder,while the influence of orientation and latitude of bridges is comparatively little.