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将混凝土视为由骨料、砂浆以及它们之间的界面过渡区(ITZ)组成的细观复合材料,建立了一种包含零厚度粘结单元在内的有限元模型,将粘结单元嵌入到ITZ中以及砂浆单元的边界上,以形成潜在的裂缝发展路径。利用该模型对已生成的二维混凝土试件进行了单轴压缩的数值试验,获得了试件的应力-应变关系曲线以及试件从微裂纹萌发、裂缝开展到最后压溃破坏过程的裂缝演变状态,得到的宏观裂缝及溃裂形态与轴压物理试验十分相近,得到的力学响应曲线与物理试验也呈现良好的一致性。
Considering concrete as a mesoscopic composite consisting of aggregate, mortar and interfacial transition zone (ITZ) between them, a finite element model including a zero-thickness bonding unit was constructed. The bonding unit was embedded ITZ and mortar units on the boundary to form a potential fracture development path. Using this model, the numerical experiment of uniaxial compression of the generated two-dimensional concrete specimen was carried out, and the stress-strain curve of the specimen and the crack evolution of the specimen from the initiation of microcrack to the final crushing failure were obtained State, the macroscopic cracks and rupture morphology obtained are very similar to the physical tests of axial compression, and the obtained mechanical response curves and physical tests also show good consistency.