Abstract This paper presents a meso-scale modelling framework to investigate the fracture process in concrete subjected to uniaxial and biaxial compression accounting for its mesostructural characteristics. 3D mesostructure of concrete consisting of coarse aggregates, mortar and interfacial transition zone between them was developed using an in-house code based on the Voronoi tessellation and splining method, which enables to generate the realistic-look aggregates with controllable structural features such as content, location, size and shape. Based on the generated 3D mesostructure, the concrete damage plasticity approach was employed to simulate the compressive fracture behaviour of concrete in terms of crack morphology and stress-strain response against the shape parameters of aggregate. Results indicate that the shape of aggregate has a negligible effect on compressive strength of concrete, which is highly associated with the random location and size distribution of aggregate. The aggregate irregularity has a significant influence on crack initiation and growth of concrete.

中文翻译：

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具有不规则形状骨料的混凝土压缩断裂的细观模型

摘要 本文提出了一个细观模型框架，以研究混凝土在单轴和双轴压缩下的断裂过程，考虑到其细观结构特征。由粗骨料、砂浆和它们之间的界面过渡区组成的混凝土的 3D 细观结构是使用基于 Voronoi 镶嵌和样条方法的内部代码开发的，它能够生成具有可控结构特征的逼真骨料，例如含量、位置、大小和形状。基于生成的 3D 细观结构，采用混凝土损伤塑性方法模拟混凝土的压缩断裂行为，包括裂缝形态和应力应变响应对骨料形状参数的影响。结果表明，骨料的形状对混凝土抗压强度的影响可以忽略不计，这与骨料的随机位置和尺寸分布高度相关。骨料的不规则性对混凝土的裂纹萌生和扩展有显着影响。