Meso-scale modelling of compressive fracture in concrete with irregularly shaped aggregates
Meso-scale modelling of compressive fracture in concrete with irregularly shaped aggregates
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DOI：
10.1016/j.cemconres.2020.106317
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发表时间：
2021-02-01
影响因子：
11.4
通讯作者：
Zhang, Mingzhong
中科院分区：
文献类型：
--
作者：
Naderi, Sadjad;Tu, Wenlin;Zhang, Mingzhong
本文提出了一种细观建模框架，用于研究混凝土在单轴和双轴压缩下的断裂过程，并考虑其细观结构特征。由粗骨料、砂浆和它们之间的界面过渡区组成的混凝土 3D 细观结构是使用基于 Voronoi 曲面细分和样条方法的内部代码开发的，能够生成具有可控结构特征（如含量、位置、尺寸和形状）的逼真骨料。基于生成的 3D 细观结构，采用混凝土损伤塑性方法根据裂缝形态和骨料形状参数的应力应变响应来模拟混凝土的压缩断裂行为。结果表明，骨料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密切相关。骨料不规则性对混凝土裂缝的萌生和扩展有显着影响。
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.