混凝土弹塑性损伤本构关系统一模型

Unified elasto-plastic damage constitutive relations model for concrete

在提出了静力弹塑性损伤本构模型的基础上,通过对损伤能释放率阀值进行PERZYNA粘性规则化以及引入粘弹性—损伤阻尼应力,建立了基于能量的混凝土弹塑性损伤本构关系统一模型;给出了该模型的基本公式和相应的非线性有限元数值实现算法,并对KOYNA混凝土重力坝进行了动力非线性数值模拟。结果表明:建议统一模型能较好地描述包括应变率效应在内的混凝土典型非线性行为,并可以直接在材料本构层次考虑阻尼的影响,同时其数值算法是稳定有效的,可以应用于大型混凝土结构的非线性分析。

On the basis of the PERZYNA-type viscous regulating of the damage energy release rate thresholds and the introducing of the visco-elastic-damage damping stress, the unified framework of the elasto-plastic damage model for concrete was proposed, which is capable of describing the typical nonlinear behaviors of concrete under various loading states and taking the damping into consideration on the material scale. The primary formulations and the corresponding numerical algorithm were presented in details. The simulation results of KOYNA dam demonstrate its effectiveness and capability of predicting the nonlinear responses of large concrete structures under static and dynamic loadings.