基于改进RSA法的混凝土单轴拉伸细观力学数值模拟  

Numerical simulation of concrete meso-mechanics based on RSA method

作　　者：谷骁勇[1] 张会平[1] 王大勇[1] 张黎明[1] 张锋剑[1] GU Xiao-yong;ZHANG Hui-ping;WANG Da-yong;ZHANG Li-ming;ZHANG Feng-jian(Henan University of Urban Construction,Pingdingshan 467036,China)

机构地区：[1]河南城建学院,河南平顶山467036

出　　处：《河南城建学院学报》2022年第5期1-4,共4页Journal of Henan University of Urban Construction

基　　金：河南省重点研发与推广专项(20B130001)。

摘　　要：为了研究混凝土骨料的细观破坏情况,基于随机顺序吸附(Random sequential adsorption,RSA)法来构筑任意形状骨料,该方法不仅生成骨料形状随机,而且骨料含量高、计算速度快,尤其可以避免骨料重叠性判断运算中的重复性计算。在混凝土基体与颗粒之间、混凝土基体单元之间批量插入黏性单元,对3个不同二级配混凝土模型的单轴拉伸过程进行数值模拟,并绘制其应力-应变曲线,揭示了混凝土破坏的细观力学机理,为深入开展混凝土材料的研究提供了参考。In order to study the mesoscopic destruction of concrete aggregate,this paper constructs aggregate with arbitrary shape based on Random sequential adsorption(RSA).By this method,it could not only generate aggregate with random shape,but also creat high content of aggregate with less time.In particular,it can avoid repeated calculation in aggregate overlap judge computation.Then,the viscosity elements are inserted between the concrete matrix and particles and among the concrete matrix elements.Finally,the uniaxial tensile?failure process of three different two-stage concrete models were carried out by means of numerical analysis,and the uniaxial tensile stress-strain curves of the models were drawn.The meso-mechanical mechanism of concrete failure is revealed,which provides a reference for further research of concrete materials.

关 键 词：RSA法 有限元法 混凝土 内聚力单元 

分 类 号：TU525[建筑科学—建筑技术科学]