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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。
In order to study the three-dimensional distribution of temperature field of concrete box girder under solar radiation, the temperature field of a concrete box girder under solar radiation was simulated by ANSYS software based on the ASHRAE clear sky model. Wind speed, cleanliness of the air, bridge orientation and latitude Influence of Equal Parameters on Temperature Field of Concrete Box Girder. The results show that the calculated value of the temperature of concrete box girder is in good agreement with the measured data and the deviation is within 3 ℃, indicating that the ASHRAE clear sky model can be effectively applied to the temperature field analysis of concrete box girder. The temperature gradient of concrete box girder is in the vertical Mainly concentrated in the stem axillary region, transversely concentrated in the floor near the web area; when the web is exposed to direct sunlight, the end of the floor temperature difference between the larger horizontal, so in the design check, the flange cantilever relatively short concrete For the box girder, it is suggested to consider the influence of the transverse temperature difference on the structure of the floor; the influence of wind speed and air cleanliness on the vertical temperature difference of the concrete box girder is greater, while the influence of the azimuth and latitude of the bridge is relatively small.