The non-linear performance of concrete is determined by the heterogeneous micro-structure of concrete. The existing methods mainly focus on numerical simulation of concrete at meso-scale. In view of this, the micro-calculation model based on bond-based peridynamics (BBPD) was established by the MATLAB-ABAQUS co-simulation method. In this study, based on the concrete plastic damage model in ABAQUS, combined with the quasi-brittle damage model and the basic characteristics of BBPD, a quasi-plasticity damage model was proposed which is suitable for the simulation of concrete. The calculation results show that the micro-model based on BBPD can well reflect the mechanical properties of concrete, and the crack propagation path is affected by the heterogeneity of concrete. At the same time, the quasi-plasticity damage model was established in which the mechanical behaviour of concrete in compression/tension can be considered simultaneously. For the distribution of pores, with the reduction of large capillary pores, the crack path inside the concrete is significantly simplified, and the distribution of cracks is significantly reduced. It can improve the mechanical behaviour of the material by optimising the pore structure and reducing the distribution of large pores.

中文翻译：

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基于近场动力学的微孔混凝土准塑性损伤模型研究

混凝土的非线性性能是由混凝土的非均质微观结构决定的。现有方法主要集中在细观尺度混凝土的数值模拟。鉴于此，采用MATLAB-ABAQUS联合仿真方法建立了基于键近场动力学（BBPD）的微观计算模型。本研究以ABAQUS中的混凝土塑性损伤模型为基础，结合准脆性损伤模型和BBPD的基本特点，提出了适用于混凝土模拟的准塑性损伤模型。计算结果表明，基于BBPD的微观模型能够很好地反映混凝土的力学性能，裂缝扩展路径受混凝土非均质性的影响。同时，建立了同时考虑混凝土受压/受拉力学行为的准塑性损伤模型。对于孔隙分布，随着大毛细孔的减少，混凝土内部的裂缝路径明显简化，裂缝分布明显减少。它可以通过优化孔结构和减少大孔的分布来改善材料的力学性能。