日照作用下钢管混凝土构件温度场实测分析

Analysis on Temperature Field Tests of CFST Members under Solar Radiation

为研究日照作用下钢管混凝土构件截面的温度场,进行了钢管混凝土构件日照作用下的温度场测试,分析了日照作用下截面温度场的分布和变化规律。测试结果表明,日照作用下钢管混凝土构件截面温度场为非均匀场,圆心点的温度变化更多地受到东西向(日照方向)的影响;除圆心点外,截面沿径向的温度变化中,越靠近圆心温度变化越滞后于大气温度;在相同的日照条件下,横放构件的温度变化幅度大于竖立构件;向阳面温度变化大,背阴面温度变化小,横放构件截面最大温差大于竖立构件;截面径向的温差分布可用三次多项式来表示,竖立构件上午截面径向的最大温差和下午截面径向的最大温差相近。

In order to investigate the temperature field of CFST members under solar radiation, temperature field tests of two CFST members were carried out, in which one was placed vertically and another was placed horizontally. Analysis of the test results indicate that （ 1 ） temperature field of CFST member under solar radiation is unsymmetrical; temperature of center point is influenced by all direction＇ s temperature variation, but more by the east-west direction （solar radiation direction）; （2） the lag of temperature variation of the member to atmosphere increases in radial direction to the center point; （3） under the same solar radiation, temperature variation of the horizontally placed member is greater than that of the vertically placed one; temperature varies greater in the surface exposed to the sunshine than in the shade, the maximum temperature difference of horizontally placed member is higher than that of vertically placed one; （4） the radial temperature difference distribution can be demonstrated by cubic polynomial; to the vertically placed member, the maximum radial temperature difference in the morning is close to that in the afternoon.