混凝土单轴荷载下细观损伤破坏的数值模拟

Numerical simulation of meso-damage of concrete subjected to uniaxial loads

假设混凝土是由砂浆基质、骨料及它们之间的界面组成的三相复合材料,混凝土的细观力学性质服从Weibull分布,应用细观力学损伤模型研究了混凝土的宏观力学性质,并且通过编制有限元程序对混凝土试件在单向拉伸和压缩情况下的破坏过程进行了数值试验.模拟结果表明,该模型可以用来研究单轴荷载作用下混凝土结构的破坏机理和多种尺寸试样尺寸效应律.

Under the assumption that concrete is a three-phase composite, which is composed of mortar matrix, aggregate and their interface, and that the mesomechanical property of concrete satisfies the Weibull distribution, the damage model of mesomechanics is used to investigate the macromechanical property of concrete. Numerical simulation is made of the failure process of concrete specimens under uniaxial tension and compression by compilation of an FEM program. The result shows that the model can be used to study the mechanism of concrete failure and size effect of concrete structures under uniaxial loads.