基于等效龄期的混凝土温度应力分析

Thermal Stress Analysis of Concrete Based on Its Equivalent Age

为精确分析大体积混凝土结构温度应力分布,引入成熟度等效龄期的概念,采用数值仿真方法对大体积混凝土材料特性进行研究。在归纳总结国内外基于等效龄期成熟度力学参数计算模型的基础上,建立了考虑自身温度和温度历程的混凝土力学特性计算流程。同时,采用有限单元法,推导了基于等效龄期温度应力有限元计算控制方程,并编写相应的计算程序。针对一简单算例,分别进行温度场、温度应力计算,并将计算结果与传统方法进行比较分析。研究结果表明,基于等效龄期的混凝土温度应力分析方法更加合理精确。

Material properties of mass concrete are studied by numerical simulation method in order to analyze thermal stress of mass concrete accurately,and the equivalent age is introduced to describe the mechanical properties of concrete. The calculation models of concrete mechanical parameters are summarized,and then the calculation procedures are established on the basis of equivalent age,in this way,the temperature and temperature history are considered in these models. Then,the governing equation and computer program of the thermal stress based on the equivalent age are developed. The comparison of the results of a numerical example using proposed method and conventional FEM method shows that the proposed method performs more reasonably and accurately.