混凝土结构日照效应计算中换热参数的修正

Amendment of heat transfer parameters in the calculation of solar action for concrete structure

日照辐射作用下换热参数的合理计算会直接影响混凝土结构温度效应分析结果的优劣。综合分析建筑和桥梁混凝土结构服役过程的实际情况,考虑风速、温差、结构朝向、所处位置等环境因素的变化,对通过试验室取得的混凝土表面对流换热、总热换热参数进行合理修正。由于风速和结构朝向是影响换热参数的主要因素,计算公式中主要针对这两个因素进行修正,提出符合实际情况的混凝土表面对流换热、总热换热参数计算公式,为混凝土结构日照效应分析中换热参数的计算提供较精确的方法。

The rational calculation of heat transfer parameters under solar radiation would directly influence the analysis results of temperature effect for concrete structure.Comprehensive analysis of the actual situation of the building and bridge concrete structure during their service periods, and taking into account the change of environmental factors such as the wind speed, temperature, structural orientation and location, the parameters of the convective heat transfer and total heat transfer, which obtained in the laboratory, were amended respectively.For the calculation of the heat transfer parameters, the wind speed and structural orientation were the main influence factors, the calculation formulas were amended in light of the two influence factors.The calculation formulas provided could consider the actual environmental situation of the concrete surface, and gave more accurate methods for calculating the heat transfer parameters in the analysis of the solar action of concrete structure.