多种因素耦合作用下的大体积混凝土温度应力仿真分析

摘要

Simulatian analysis of themud stress on mass concrete finds that the factors such as elastic modulus, creeping and shrinkage of concrete all have influence on the thermal stress. Based on the theory of thermal elastic plasticity, the constitutive modal of thermal stress and strain of mass concrete is established. And then the thermal elastic-plastic FEM expression for thermal stress of mass concrete is put forward. MIDAS, FEM software, is used to make numerical simulation analysis based on a concrete project and the general rules of thermal stress of mass concrete are concluded. The result of theory analysis is quite the same with that in practice, which indicates that the conclusion and suggestion made in this paper are of some theoretical and practical value.%在大体积混凝土结构温度应力仿真分析过程中,混凝土的弹性模量、徐变和干缩等因素与温度都有关系,对温度应力都有影响.本文以混凝土热弹塑性应变理论为基础,建立了考虑徐变等因素影响下的大体积混凝土温度应力本构模型,得出了大体积混凝土温度应力的热弹塑性有限元表达式.在此,利用有限元分析软件MIDAS,对一实际工程进行了数值仿真分析,得出了温度应力的一般规律,理论分析结果与实测结果吻合较好,所得结论和建议具有一定的理论意义和实用价值.