Micromechanical investigation on size effect of tensile strength for recycled aggregate concrete using BFEM
Micromechanical investigation on size effect of tensile strength for recycled aggregate concrete using BFEM
复制标题
再生骨料混凝土抗拉强度尺寸效应的BFEM微观力学研究
DOI：
10.1007/s10999-015-9333-y
复制
发表时间：
2016-12-01
影响因子：
3.7
通讯作者：
Pu, Jiwei
中科院分区：
文献类型：
--
作者：
Peng, Yijiang;Pu, Jiwei
本文通过算例研究了基于势能原理的基力单元法的有效性和性能。采用损伤力学的BFEM方法，在细观水平上分析了尺寸对再生骨料混凝土抗拉强度的影响。再生骨料混凝土是由天然粗骨料、新砂浆、新界面过渡区（ITZ）、旧砂浆和中观旧ITZ组成的五相复合材料。采用随机骨料模型模拟再生骨料混凝土的细观结构。采用损伤力学的BFEM模拟了单轴拉伸载荷下RAC力学性能的尺寸效应。仿真结果与试验结果吻合较好。该分析方法是研究RAC断裂机理和力学性能数值模拟的新途径。
In this paper, the validity and performance of base force element method (BFEM) based on potential energy principle was studied by some numerical examples. And the BFEM on damage mechanics is used to analyze the size effect on tensile strength for recycled aggregate concrete (RAC) at meso-level. The recycled aggregate concrete is taken as five-phase composites consisting of natural coarse aggregate, new mortar, new interfacial transition zone (ITZ), old mortar and old ITZ on meso-level. The random aggregate model is used to simulate the meso-structure of recycled aggregate concrete. The size effects of mechanical properties of RAC under uniaxial tensile loading are simulated using the BFEM on damage mechanics. The simulation results agree with the test results. This analysis method is the new way for investigating fracture mechanism and numerical simulation of mechanical properties for RAC.