考虑初始弹模变化的混凝土动力损伤本构模型

Dynamic damage constitutive model for concrete accounting for the difference of the initial elastic modulus

混凝土的动力本构模型是混凝土结构动力分析的基础,混凝土的初始弹模变化对其动力本构有显著的影响。该文研究考虑初始弹模变化的混凝土动力损伤本构模型的建立方法。首先根据损伤理论建立了混凝土动力损伤与静力损伤之间的关系,并且考虑了动力损伤与静力损伤之间初始弹性模量的差异,进而建立了基于静力损伤本构理论的混凝土动力损伤本构方程。该方程可以考虑弹模变化和加载速率的变化对本构方程的影响。文中还利用现有实验结果进行了验证,表明该文建立的模型可以较好地反映混凝土的动力损伤特性。

A dynamic damage constitutive model was developed accounting for the effect of the initial elastic modulus of the concrete for dynamic analyses of concrete structures. The static and dynamic damage to the concrete was related as a function of the difference in the initial elastic modulus for static and dynamic loading conditions. The dynamic damage constitutive model for concrete was derived based on the static damage constitutive model. The dynamic model accounts for the changes of the initial elastic modulus and the loading rate. Comparison of the prediction with experimental data shows that the dynamic damage constitutive model accurately reflects the dynamic damage characteristics for concrete.