混凝土三维细观接触面模型数值模拟与CT试验验证  

Numerical simulation on 3D meso-contact mesh of concrete and CT test verification

作　　者：党发宁[1] 梁昕宇[1] 陈厚群[1,2] 

机构地区：[1]西安理工大学岩土工程研究所,西安710048 [2]中国水利水电科学研究院工程抗震中心,北京100044

出　　处：《计算力学学报》2011年第1期119-124,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金重点(90510017);国家自然科学基金(50679073,50879069);水利部公益性行业科研专项(2007SHZ1-200701004);西安理工大学优秀博士基金(106-210909)资助项目

摘　　要：对混凝土三维随机骨料模型进行了改进,在骨料和砂浆之间加入了"面-面接触单元"模拟两者的接触特性,编制了相应的命令程序,称新模型为混凝土接触面模型。采用双折线损伤演化模型进行计算,对数值模拟结果进行了分析研究。从混凝土破坏过程图和荷载-位移曲线图两方面与CT试验结果进行了比较,表明试件破坏时裂纹的萌生、扩展过程与CT试验观测到的过程具有相似性,数值计算的荷载-位移曲线与物理试验具有一定程度的一致性。混凝土接触面模型克服了随机骨料模型中的界面层太厚,计算单元多,计算速度慢的弊端,且解决了原模型裂纹空洞区大的问题,不仅可以较好地使混凝土数值模型更接近于实际物理模型,而且大大提高了计算速度。The contact mesh model is used to improve 3-D model of random aggregate concrete.Contact mesh is used for simulating interface material between aggregate and motor,the corresponding calculation program is made.So the new model is called contact mesh model of concrete.The conduplicate-line damage evolvement model is applied,the computation results of numerical simulation are analyzed and researched.The results of numerical simulation and CT experiment are compared in failure charts of concrete and curve charts of load-displacement.The crack initiation and propagation are similar with the results of CT experiment;the curve chart of load-displacement of numerical computation is certain extent uniformity with real experiment results.Thereby the contact mesh model overcomes the shortages of random aggregate model,which are as follows： the great thickness of the interface,the great number of element,the slow calculation speed,and the wide hole-zone of crack so,it is indicated that the improved numerical model of concrete can not only be more similar with the real model,but also greatly increase the speed of computation.

关 键 词：混凝土 随机骨料模型 接触面模型 应力 位移 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1