Abstract:Concrete is a nonhomogeneous composite material. Thus, its mechanical properties are affected by its mesostructure, and the isolation of the influences of various factors on the mechanical properties of concrete is difficult. In this study, concrete is considered as a three-phase material that consists of aggregates, mortar, and interface. Numerical experiments are conducted to analyze the influence of microstructural parameters (e.g., aggregate position, element size, material strength, and aggregate size) on the properties of concrete under dynamic compressive load and dynamic tensile load. The mesostructure of concrete affects the dynamic mechanical properties of concrete. However, different factors have different weights, and the same factor may exert different effects under different loads.