基于改进Sargin方程和过-徐模型的混凝土三维损伤模型

利用混凝土已有本构关系建立混凝土三维损伤模型.针对基于Ottosen本构关系建立的损伤模型中的不足之处,提出基于改进Sargin方程和过-徐模型建立混凝土三维损伤模型的方法.该方法利用改进的Sargin方程作为混凝土三维应力状态的等效单轴方程,基于等效单轴方程的割线弹性模量的下降率定义损伤指标,对典型比例加载情形全过程进行损伤计算.与Mazars、Ottosen损伤模型进行对比,该模型更符合试验结果,更能够描述不同加载比例下的损伤.

Three-dimensional damage model of concrete based on revised Sargin equation and Guo-Xu model

Employing the method of developing a three-dimensional damage model based on an established constitutive model,a three-dimensional damage model of concrete was presented by using the revised Sargin equation and Guo-Xu model in order to remove the shortages of damage model derived from Ottosen's constitutive model.This damage model took the revised Sargin equation as the equivalent uniaxial equation for the three-dimensional stressing.The decline rate of the secant elastic modulus of the equivalent uniaxial equation was defined as the damage index.Damage analysis was carried out for the whole process of typical proportional loading.It was found that this damage model had better agreement with experiments and wider applicability compared with the Mazars damage model and the Ottosen damage model.