渡槽表面温度边界条件分析

渡槽长期暴露在空气中,外界温度变化对结构内力影响巨大,甚至引起建筑物的破坏,因此准确分析渡槽的温度边界条件具有重大的意义.首先从气象学和传热学原理出发,分析了建筑物的气温条件,以及由于太阳辐射引起的日辐射强度、空气散射强度、地面反射强度和地面辐射强度等,然后再根据规范经验公式计算,并以南水北调中线工程河北省段规模最大的渡槽--洺河渡槽为例,计算了顶面、东侧面、西侧面和底面随时间变化的外表面温度,最后分析了渡槽内的水温变化.

Analyses on Temperature Boundary Condition of Aqueduct Surface

The aqueducts chronically exposure in the air. The variety of temperature in the environment can affect the structural internal force hugely, even can destroy the construction. It is significant to analyze the temperature boundary condition of aqueducts accurately. On the meteorology and heat transfer theory, the air temperature condition of the construction is analyzed, and some thermodynamic norms as the day radiant intensity, the air dispersion intensity, the ground reflected intensity and the ground radiant intensity etc. which are caused by the solar radiation are also studied. They are calculated through the empirical formula in correlative criterion. The Minghe aqueduct, as the biggest aqueduct in Heibei Section in the Middle Line of the South-to-North Water Transfer Project, is an example. We calculate the aqueduct surface temperature from the top, the bottom, the east side and the west side, systematically analyze variation of water in the aqueduct.