This paper presents a computational framework for modelling the fracture process in concrete under static and dynamic tensile loading considering its mesostructural characteristics. 3D mesostructure of concrete composed of real-shape coarse aggregates, mortar, interfacial transition zone between them and voids was developed using an in-house code based on Voronoi tessellation and splining techniques. Cohesive zone model was then employed to simulate the tensile fracture behaviour of concrete in terms of stress- and energy dissipation-displacement responses and crack mechanisms against the shape (spherical and irregular) and volume fraction (30%, 35% and 40%) of aggregate and strain rate (0, 1, 10 and 50 s⁻¹). Results indicate that the irregular shape of aggregate has an important role in the micro-crack nucleation and ultimate fracture pattern but exhibits an insignificant effect on the tensile strength of concrete, which is mainly dependent on the strain rate and the random location and size distribution of aggregate.

考虑到混凝土的细观结构特征，本文提出了一种计算框架，用于模拟混凝土在静态和动态拉伸载荷下的断裂过程。使用基于Voronoi细分和花键技术的内部代码，开发了由实形粗骨料，砂浆，它们之间的界面过渡区和空隙组成的混凝土的3D介观结构。然后采用内聚力区模型来模拟混凝土的拉伸断裂行为，包括应力和能量耗散位移响应以及针对形状（球形和不规则形）和体积分数（30％，35％和40％）的裂纹机理。骨料和应变率（0、1、10和50 s ^-1）。结果表明，不规则形状的骨料在微裂纹成核和最终断裂模式中起着重要作用，但对混凝土的抗拉强度影响不大，这主要取决于应变率以及混凝土的随机位置和尺寸分布。骨料。