大体积混凝土水化热温度场数值分析

NUMERICAL ANALYSIS OF HYDRATED HEAT TEMPERATURE FIEDL OF MASSIVE CONCRETE

大体积混凝土结构厚、体形大的特点决定了其施工的关键在于控制裂缝的产生。在工程实践中,需考虑由温差和混凝土收缩所产生的温度应力是否超过当时的基础混凝土极限抗拉强度,因而必须进行严格的防裂理论计算。本文以某工程底板施工为例,探讨了相关的温度应力计算和裂缝控制措施,利用结构有限元分析程序Midas对大体积混凝土三维温度场和应力场进行模拟计算,并对计算结果进行了分析。

Thick and big characteristics of mass concrete structure determines its construction key which lies in the occur of controling cracks.In engineering practice,we need to consider temperature stress producing by the temperature difference and shrinkage of concrete whether it beyonds concrete ultimate tensile strength,so it must be strict crack-proof theoretical calculation.Based on an engineering base slab construction,the paper discusses related temperature stress computation and crack control measures,and uses structure finite element analysis program ＂Midas＂ three-dimensional to simulate mass concrete of the temperature field and stress field,and the calculated results are analyzed.