基于应力-应变曲线的混凝土弹塑性损伤本构模型

Elastic-Plastic Damage Constitutive Model for Concrete Based on Stress-Strain Curve

为了准确地模拟混凝土材料的力学性能,从有效应力的角度出发,基于连续损伤力学基本原理,根据混凝土的应力-应变关系曲线(以改进的Saenz曲线为例),推导出混凝土受压损伤演化方程,建立基于应力-应变曲线的混凝土弹塑性损伤本构模型,并且开发进入ABAQUS中;通过数值模拟与试验结果对比分析,结果表明该本构模型可很好地描述混凝土的塑性变形、刚度退化的力学行为;对钢筋混凝土桥墩的振动台试验进行模拟,结果表明该模型可较好地模拟地震作用下钢筋混凝土桥墩的损伤演化过程,因此该方法建立的混凝土弹塑性损伤本构模型具有工程应用意义.

To accurately simulate the mechanical properties of concrete,from the point of view of effective stress,the pressure-damage evolution equations of concrete are deduced,and an elastic-plastic damage constitutive model of concrete is proposed that based on basic principle of continuous damage mechanics and the stress-strain curve of concrete( e. g.,improved Saenz curve). Tests results show that the plastic deformation and stiffness degradation can be well described compared with numerical simulation. This model can well simulate the damage evolution of the concrete bridge pier under earthquake action by simulating the shaking table test of reinforced concrete bridge pier,therefore,the elastic-plastic damage constitutive model of concrete established with this method has significance for engineering application.