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采用基于伸缩因子的圆形覆盖方法建立更贴近于真实情况的一系列二维随机骨料模型,采用塑性损伤模型系统地对比分析了二维随机骨料模型在不同骨料形状、骨料粒径搭配、初始缺陷、界面层厚度、界面层及砂浆强度等情况下的单轴拉伸性能.结果表明,拉伸破坏首先出现在最为薄弱的界面层;骨料形状的不同对试件拉伸性能影响较大;界面层厚度对混凝土试件脆性有所影响,对其他性能影响较小;相同试件初始缺陷的增加会导致试件弹性模量、极限抗拉强度及峰值拉应变的减小;界面强度与骨料比例、形状、初始缺陷等对混凝土试件拉伸性能影响最大;本方法可有效地模拟混凝土轴向抗拉,揭示混凝土裂纹扩展的方式及过程.
A series of two-dimensional random aggregate model which is more close to the real situation is established by circular covering method based on scaling factor. The plastic damage model is used to systematically and comparatively analyze the effect of two-dimensional random aggregate model on the aggregate shape, aggregate size The initial defect, the thickness of the interface layer, the interface layer and the mortar strength of the uniaxial tensile properties of the results show that tensile failure first appeared in the weakest interface layer; aggregate shape of the tensile properties of the specimen The thickness of the interface layer affects the brittleness of the concrete specimen and has little effect on other properties. The increase of the initial defects of the same specimen will lead to the decrease of the elastic modulus, the ultimate tensile strength and the peak tensile strain of the specimen; The influence of interface strength, aggregate ratio, shape and initial defect have the greatest influence on the tensile properties of concrete specimens. The method can effectively simulate the axial tensile of concrete and reveal the way and process of concrete crack propagation.