混凝土结构对流换热效应的研究

The research of convection heat transfer effect in concrete structure

综合分析了国内外学者对混凝土对流换热系数的研究成果,结合风洞实验,提出了混凝土对流换热系数计算公式,可用于混凝土结构温度效应分析。并利用有限元程序进行预应力混凝土简支箱梁的温度效应分析,计算中采用了标准化的太阳日辐射强度曲线和日气温变化曲线,以梁的跨中挠度和轴向变形的变化规律为例,讨论了对流换热系数取值对结构温度效应的影响。

Based on the analysis of research results on the concrete convection heat transfer coefficient, and by tunnel experimental result, the formula of convection heat transfer of concrete are put forward, which can be used for the analysis of temperature effect in concrete structure. Finite element analysis program was used to analyze the temperature effects of a prestressed concrete simple supported box beam. The uniformed solar radiation strength curve and daily temperature change curve were used in calculation. The influence of different convection heat transfer coefficient on the temperature effects of concrete structure, take mid-span deflection and axial deformation of the beam as examples, was discussed.