基于非均匀散热边界的大体积混凝土温度应力场分析

Surface Thermal Insulation of Mass Concrete During Cold Wave

大体积混凝土表面散热系数的数值与边界风速有很密切关系,简单的均匀散热边界假设已经不能满足实际工程中,复杂边界温控计算的需要,提出基于风速的非均匀散热系数边界法.基于此法建立大体积混凝土三维有限元模型,计算其温度场和应力场,并与匀散热系数边界工况比较,分析非均匀散热边界对大体积混凝土温控的影响.

The surface thermal coefficient of mass concrete has a close relationship with boundary wind speed~ a simple uniform thermal boundary assumption can not meet the need of temperature control calculation of complex boundary in the actual project. So the nonuniform thermal coefficient boundary method based on wind speed is proposed. And the mass concrete three-dimensional finite element model is established; and the temperature field and stress field are calculated. Compared with the uniform coefficient of thermal boundary conditions, the influences of nonuniform thermal boundary on temperature control of mass concrete are ana- lyzed.