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中文摘要：
为确定预插黏性界面单元法模拟混凝土细观拉伸断裂的有效性和适用性,基于黏性裂缝模型理论,在实体单元中嵌入黏性界面单元(cohesive interface elements),对东江拱坝二级配混凝土试件单轴受拉的断裂过程进行数值模拟.按照试件的实际配比计算出各种粒径骨料的数目,采用Monte-Carlo法对混凝土骨料进行随机投放,生成试件的随机骨料模型,研究黏性界面单元的网格密度、骨料随机分布形式及界面单元的断裂参数对混凝土宏观力学性能及断裂模式的影响.结果表明:采用黏性界面单元可有效地模拟混凝土材料细观断裂破坏过程和宏观力学性能.
英文摘要：
In order to determine validity and applicability of numerical simulation of mesoscopic tensile fracture process of concrete using the cohesive elements, based on the cohesive crack model theory, by embedding cohesive interface elements inside solid finite element meshes, two-graded concrete specimen of Dongjiang arch dam were numerically simulated under uniaxial tension. The number of aggregates according to the aggregate content and average diameter of aggregate for one grading were calculated, the Monte Carlo method was used to generate the random aggregate model. The effects of mesh density of the cohesive element, aggregate distribution and fracture parameter used for aggregate-mortar interface elements on the damage mode and macro mechanical properties were investigated. The results indicate that it is an efficient method to simulate the fracture process of concrete materials with the zero-thickness cohesive elements and macro-mechanical properties.
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