孔径分布对混凝土损伤破坏的影响

摘要

Numerical analysis software MATLAB has been adopted to simulate and generate random pore.Pore coordinates and aperture have been imported into ANSYS software with APDL program to make finite element analysis.Two-dimensional numerical calculation model of concrete pore mesoscopic element has been set up, element birth and death technology has been adopted to simulate the damage process of concrete pore, influence of pore distribution on mechanical behavior of concrete has been analyzed.Research results have shown that pore distribution affects the damage behavior of concrete.When the porosity of concrete is the same, the smaller aperture, the bigger strain and damage area;the ductility of concrete can be improved and the concrete will be with better cushion property.%利用数值分析软件MATLAB模拟生成随机孔隙,借助APDL程序将孔隙坐标及孔径导入ANSYS软件进行有限元分析.建立混凝土孔隙细观单元的二维数值计算模型,借助单元生死技术模拟混凝土孔隙的损伤破坏过程,分析孔径分布对混凝土力学行为的影响.研究结果表明:孔径分布影响混凝土的损伤破坏行为,混凝土的孔隙率相同时,孔径越小,其应变及破坏损伤区域范围越大,混凝土延性得以提高,混凝土具有较好的缓冲性能.