单轴荷载作用下混凝土强度代表体尺寸定量研究  

Quantitative Study on the Representative Volume Element Size of Concrete Strength under Uniaxial Loading

作　　者：王娟[1] 王会娟[2] 许耀群 武霄鹏[1] WANG Juan1 , WANG Huijuan2 , XU Yaoqun1 , WU Xiaopeng1(1. School of Water Conservancy and Environment Zhengzhou University, Zhengzhou 450001, China; 2. Xinlian College of Henan Normal University, Zhengzhou 45000, Chin)

机构地区：[1]郑州大学水利与环境学院,河南郑州450001 [2]河南师范大学新联学院,河南郑州450000

出　　处：《郑州大学学报（工学版）》2018年第1期12-17,28,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51309203);中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金(IWHR-SKL-201512);水利部堤防与病害防治工程技术研究中心开放课题基金资助项目(2016002);河南省高等学校重点科研项目(15A570010)

摘　　要：为从细观层次研究混凝土宏观力学性能,提出了混凝土强度代表体定义,建立了基于统计特征的混凝土强度代表体尺寸确定方法.采用三维随机缺陷界面弹簧元模型,给出了确定单轴加载下的混凝土强度代表体尺寸的数值方法.分析了不同数值样本取值对混凝土单轴受拉及单轴抗压强度离散性的影响规律,以及尺寸试件变化对混凝土拉伸及受压强度仿真结果稳定性的影响规律.研究结果表明,在单轴拉伸荷载和单轴压缩荷载作用下,混凝土强度代表体尺寸分别为最大骨料粒径的5.0倍和6.5倍,与基于细观结构统计特征确定的混凝土几何代表体尺寸进行对比,证明了所提方法的合理性.Based on meso-numerical simulation technology,a new method was developed for the determination of the RVE（ representative volume element） size of concrete. The uniaxial tensile and compressive strength of concrete specimens with various RVE size were calculated by means of the interfacial spring element model.Then the RVE size was determined quantitatively by analyzing the discreteness of concrete strength and the increase trend of concrete strength. Results showed that the RVE size for concrete uniaxial tensile and compressive strength were 5 times and 6. 5 times of maximum aggregate diameter of concrete respectively,which were close to the RVE sizes for concrete micro-structure. This study could enrich the numerical methods for strength analysis of concrete and lay a foundation for multi-scale analysis of concrete.

关 键 词：混凝土 代表体 强度 细观尺度 定量分析 

分 类 号：TU313[建筑科学—结构工程]