文档介绍：多种因素耦合作用下的大体积混凝土
温度应力仿真分析
Simulation Analysis of Thermal Stress of Massive Concrete
in Multi-factor Coupling Effecting
李彬彬1 * 李彬彬(1979- ),男,助理工程师。研究方向为大体积混凝土温度应力有限元分析与控制等。
,王社良1,苏三庆2
(,西安710055;,西安710054)
Li Binbin Wang Sheliang Su Sanqing
(1. College of Civil Eng., Xi’an Univ. of Arch.&Tech. Xi’an 710055; 2. Xi’an Univ. of Scie.&Tech. Xi’an 710054)
摘要: 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,对温度应力有一定的影响。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。同时,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。
关键词: 大体积混凝土; 温度应力; 热弹塑性;耦合;仿真分析
Abstract: In the analysis of thermal stress of massive concrete, the thermal stress of massive concrete is influenced by multi-factors including elastic modulus 、the creep and shrink etc. In the foundation of theory of the thermal elastic-plasticity and multi-factor coupling effecting, the constitutive model of thermal stress and strain of massive concrete is established. And then the thermal elastic-plastic FEM expression for thermal stress of massive concrete is put forward. The paper uses of the MIDAS to make numerical simulation analysis in a project, the general regularities of thermal stress of massive concrete have been concluded. The results of theory analysis in the paper are identical with the results in practice, and the obtained conclusi