基于两相结构的混凝土数值试验研究

Numerical experimental of concrete based on two phase structure

混凝土常被看作两相的复合材料,即骨料和水泥砂浆。由于骨料和水泥砂浆不同的力学特性,在外荷载作用下会呈现出对拉应力比较敏感的准脆性变形和破坏特征。该研究针对混凝土的这一特性,将混凝土看作两相材料,利用FLAC^(3D)模拟其弹脆性破坏过程,探索混凝土试件在外荷载作用下的断裂破坏过程。研究成果揭示了混凝土的细观力学机制,对实际工程有重要的参考意义。

Concrete is often treated as a composite of two phases,namely aggregate and cement mortar. Due to the different mechanical properties of aggregate and cement mortar,the quasi brittle deformation and failure characteristics,which is sensitive to tensile stress,will appear under external loads. In this paper,the concrete is treated as a two phase material,and its elastic-brittle failure process is simulated by FLAC-（3D）. The fracture process of concrete specimen under external load is investigated. The results of this study reveal the micromechanical mechanism of concrete and have important reference value for engineering.