摘要
在细观层次上,把混凝土看作是由水泥砂浆、骨料及二者之间的界面组成的复合材料,应用渐变网格剖分方法对随机投放的骨料、界面和水泥砂浆进行网格剖分,删除多余节点,重新排列节点顺序,生成三维随机骨料分布的细观有限元数值模型.利用该模型分别进行了混凝土的单轴拉伸、压缩、劈拉和梁弯曲等数值试验,分析了不同界面参数、不同砂浆损伤参数、不同加载形式对混凝土试件的变形特点、破坏形式以及承载能力的影响,探讨了混凝土宏观力学性能(如应变软化和剪胀等性质)的细观机制.
In mesoscopic aspect, concrete was taken as a three-phase composite consisting of cement mortar matrix, aggregates and their interfaces. By use of gradually-transitional mesh generation method, the random distributed aggregates, the interfaces and the mortar matrix are meshed in turn. By deletion of the redundant nodes and reordering of the nodes, a meso-finite element model for 3D randomly distributed aggregates was finally established. The model was applied to numerical simulation of uniaxial tensile test, uniaxial compression test, splitting tensile test, and bending test of beam. The deformation characteristics, failure modes and the carrying capacity under different interface parameters, different mortar damage parameters and different loading patterns were analyzed, and the meso-mechanism of some macro-mechanical performances of concrete （such as strain softening and shear dilatancy） was discussed.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第3期319-325,共7页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金委员会
二滩水电开发有限责任公司雅砻江水电开发联合研究基金重点资助项目(50539090)
国家自然科学基金资助项目(50679022)
关键词
随机骨料分布
网格渐变剖分
三维细观数值模型
数值试验
Mazars损伤模型
random aggregate distribution
gradually-transitional mesh generation
three-dimensional meso-numerical model
numerical experiment
Mazars damage constitutive model
