再生玻化微珠保温混凝土随机损伤单轴受拉本构关系研究

Study on stochastic damage constitutive relationship for recycled aggregate thermal insulation concrete under uniaxial tensile

考虑到再生玻化微珠保温混凝土组成材料物理性能的差异性,通过对不同原生强度再生骨料配制的再生保温混凝土受拉本构关系的研究,以及对建立的细观单元中弹簧弹性模量质量相对关系的分析,揭示了再生玻化微珠保温混凝土的受拉破坏机理,定义了受拉损伤变量。在弹簧模型理论的基础上,得到了再生玻化微珠保温混凝土受拉随机损伤本构模型和应力均值表达式,模型能很好地反映出混凝土在受拉时的损伤演化和刚度退化过程,并且模型计算结果与试验结果基本一致。

Considering the differences of physical properties of composition materials of recycled aggregate thermal insulation concrete （RATIC）, and through the research on the constitutive relationship of RATIC prepared by recycled aggregate of various types of primary strength,and the analysis of the relative relationship between the spring elastic modulus and mass of the estab- lishedmicro units, this paper reveals the failure mechanism of RAT1C in tensile, and the definition of the tensile damage variable. On the basis of spring model theory,the stochastic damage constitutive model of RATIC under tension and the mean stress expres- sion is given. The model reflected the damage evolution and stiffness degradation process of concrete in tension, and model calcula- tion results are basically consistent with the test results.