基于随机骨料模型的混凝土界面过渡区研究分析

Research and Analysis of Concrete Interface Transition Zone Based on Random Aggregate Model

摘要: 由于宏观模型难以揭示混凝土内部结构、组成与宏观力学性能之间的关系，本研究建立随机骨料细观模型进行有限元单轴受压试验模拟。通过Python语言编写程序进行前处理，生成随机凸多边形骨料，并实现骨料的自动随机投放，建立随机骨料模型。在有限元软件Abaqus中，基于塑性损伤模型对随机骨料模型进行单轴压缩模拟，追踪试件压缩破坏的损伤发展过程。发现裂缝总是从界面过渡区开始发生，绕开骨料在砂浆基质中发展至试件贯通破坏。并定量地给出了同一投放率下，骨料粒径对界面过渡区含量的影响。

Abstract: Due to the difficulty of macroscopic models in revealing the relationship between the internal structure, composition, and macroscopic mechanical properties of concrete, this study establishes a random aggregate microscopic model for finite element uniaxial compression test simulation. Write a program in Python language for preprocessing, generate random convex polygon aggregates, and implement automatic random feeding of aggregates to establish a random aggregate model. In the finite element software Abaqus, a uniaxial compression simulation was conducted on a random aggregate model based on a plastic damage model to track the damage development process of the compression failure of the specimen. Cracks are always found to occur from the interface transition zone, bypassing the aggregate and developing into the mortar matrix until the specimen penetrates and fails. And quantitatively provided the influence of aggregate particle size on the content of interface transition zone at the same feeding rate.