| At home and abroad, concrete has become one of the most widely used construction materials. The relevant literature suggests that the destruction and evolution of structural damage occurred in different macroscopic and mesoscopic magnitude space, The existing experimental study of mesoscopic concrete case requires a lot of manpower and material resources. Therefore, more and more scholars began to focus on numerical simulation to explore concrete internal damage.In numerical simulation, the studies of concrete material properties are divided into three different levels:macro, meso and micro. Meso level is the most suitable and useful in these three levels, which assess composite material properties like concrete. In this paper, a coordinate program of concrete random aggregate mesoscopic model in three-dimensional space is written by Monte Carlo random number methods and programming software, and then the already coordinate position of aggregate are put through the finite element software into concrete model to form an aggregate non-overlapping three-dimensional concrete mesoscopic model. The established random aggregate model is analyzed under uniaxial compression, and through uniaxial compressive failure, the three components of aggregate, mortar and interface of stress and strain were analyzed with the loading process mechanical changes. At the same time, the same scale with different aggregate size model and the same aggregate size with different scale model were simulated and the results were compared. This paper find that the relevance of concrete uniaxial compressive failure with aggregate size and explore the mechanism of aggregate size impact on catastrophic rupture. At the same time compared with existing experimental results to further explore the correctness. Finally, the concrete damage evolution is explored by strain fluctuations quantitatively, and compared the impact of the size of aggregate with impact of the size of model to strain fluctuations. |
PDF Full Text Request