基于细观物理机制的混凝土损伤数值仿真

Meso-mechanism Based Simulation of Concrete Damage Process

首先利用数字图像处理技术生成能反映混凝土真实结构的数值试件,然后从细观角度将混凝土分为三相:骨料、硬化水泥浆体及其界面.根据界面区的细/亚细观物理结构,提出了一类界面过渡区简化模型.对其余两相材料,分别建立了不同的细观单元本构关系及损伤破坏准则.由此,建立了基于细观物理机制的混凝土损伤数值仿真模型.数值仿真结果与真实试验结果比较表明,该方法可以成为一种较可靠的细观损伤数值仿真途径.

At first, a numerical model using digital image process technique was built. Then, the concrete was divided into three phases： aggregate, hardened mortar and ITZ（interfacial transition zone）. According to three kinds of meso/sub-meso physical structures, different meso-constitutive relations have been proposed. Finally, by comparing numerical and real test results, it is easily found that this method can build a more reliably meso damage numerical model than ever.