高强高性能混凝土损伤的细观数值演化  

Meso-scale Numerical Analysis of Damage Evolution of High-strength and High-performance Concrete

作　　者：郑捷[1] 左河山 陈景恒 曹文平[1] 郑山锁[1] 

机构地区：[1]西安建筑科技大学建筑设计研究院,陕西西安710055

出　　处：《地震工程学报》2016年第5期745-750,769,共7页China Earthquake Engineering Journal

基　　金：国家科技支撑计划(2013BAJ08B03);国家自然科学基金(51678475);教育部高等学校博士学科点专项科研基金(20136120110003)

摘　　要：在细观层次上,混凝土可以被看作由水泥基、分散粒子和界面过渡层组成的三相复合材料。首先,基于骨料分布和形态的随机特性,将瓦拉文公式推广应用于确定二维混凝土试件截面凸多边形骨料分布,提出圆形骨料模型中以圆骨料的面积为控制参数,以圆内接多边形为基架的凸多边形随机骨料算法。进而以C80高强高性能混凝土为例,对数值试样进行单轴受压的数值模拟,得到相应的应力-应变曲线和损伤演化图。数值模拟结果与物理试验结果对比表明本文提出的数值模型合理可行。On a meso-level,concrete can be seen as a three-phase composite material comprising a cement base,aggregate,and a transitional zone between the cement and aggregate.In this study,based on the random characteristics of the aggregate distribution and morphology,the Walraven formula is applied to determine the convex polygonal aggregate distribution of the two-dimensional concrete specimen's cross-section.Subsequently,an algorithm for the random convex polygon aggregate is proposed,in which an area of round aggregate is used as the control parameter and the inscribed polygon of the round aggregate is used as the framework.A numerical experiment is conducted on specimens under uniaxial compression by using the high-strength and high-performance concrete C80 as an example,and corresponding stress-strain curves and damage evolution pictures are drawn.A comparison between results of the numerical simulation and the physical test show that the numerical model proposed in this paper is both reasonable and feasible.

关 键 词：高强高性能混凝土 随机骨料模型 细观数值模拟 损伤演化 损伤有限元 

分 类 号：TU528.01[建筑科学—建筑技术科学]