基于混凝土应力-应变关系的正交各向异性损伤模型及其应用

An Anisotropic Damage Model of Concrete Based on Material Stress-Strain Relationship and its Application

基于混凝土规范推荐的单轴应力应变关系曲线,结合损伤力学,推导了损伤演化方程。结合混凝土材料的五参数破坏准则,采用等效单轴方法可将单轴损伤演化方程推广为三维情况,建立计算模型,最后,采用APDL语言实现了程序化。通过对多种条件下混凝土试块的数值计算,得到了与试验比较一致的结果。对溪洛渡高拱坝进行计算的结果很合理。由于模型所需的计算参数少,同时又能比较准确地反映混凝土材料的损伤程度,因此便于工程应用。

Based on the uniaxial stress-strain relation recommended by Design Cod e for Concrete structures (GB 50010-2002), damage evolution equations are presen ted using the concept of continuum damage mechanics. In the framework of a modif ied five-parameter failure criterion, these damage equations are extended to 3D space problems according to the equivalent uniaxial approach. Finally,the propos ed model is then programmed with APDL. Numerical analyses of concrete samples su bjected to three-dimensional loading condition have been carried out. Computatio nal results agree well with those of experiments. Analyses of Xiluodu arch dam a lso give reasonable results. Though the proposed model is relatively simple, it reflects appropriately the damage level of concrete material and it requires les s computational parameters, so it may be conveniently used for engineering purpo se.