单轴压缩荷载作用下混凝土损伤破坏的细观力学分析  

Meso-mechanical analysis of concrete damage under uniaxial compression load

作　　者：何康[1] 屈伸 HE Kang;QU Shen(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Department of Civil Engineering and Architecture,Zhejiang Industry Polytechnic College,Shaoxing 312000,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]浙江工业职业技术学院建筑工程学院,浙江绍兴312000

出　　处：《混凝土与水泥制品》2024年第5期1-6,共6页China Concrete and Cement Products

基　　金：浙江省教育厅科研项目资助(Y202248582);杭钢集团科研项目资助(XKZ202212027)。

摘　　要：基于伸缩因子函数的变形方法和蒙特卡罗方法,建立了由骨料、砂浆和二者之间的界面过渡区构成的混凝土随机骨料模型。采用有限单元法对混凝土随机骨料模型的抗压强度、应力峰值、应力分布、损伤状态等力学性能进行了数值计算,从细观尺度上分析了混凝土的损伤破坏过程及裂缝形貌特征。结果表明:在单轴压缩荷载作用下,混凝土首先在薄弱区域的界面过渡区处发生拉应力和剪应力集中,产生初始损伤;然后损伤扩展至水泥砂浆,形成贯穿裂缝;最终,导致混凝土承载力失效。Based on the deformation method of expansion factor function and Monte Carlo method,a concrete random aggregate model composed of aggregate,mortar and the interface transition zone between the two was established.The mechanical properties of the concrete random aggregate model,such as compressive strength,stress peak,stress distribution and damage state were analyzed by finite element method.The damage and failure process and crack morphology characteristics of concrete were analyzed at a microscopic scale.The results show that concrete first experiences tensile and shear stress concentration at the Interface transition zone in weak areas under uniaxial compression load.At this time,the initial damage occurs.Then the damage extends to the cement mortar,and finally forms the connection crack,resulting in the failure of the concrete bearing capacity.

关 键 词：塑性损伤 细观力学 随机骨料模型 单轴压缩 混凝土 

分 类 号：TU528.01[建筑科学—建筑技术科学]