Numerical Simulation Analysis of the Dynamic Mechanical Property of Concrete Based on 3D Meso-mechanical Model

Abstract

This paper attempts to disclose the mechanical properties of concrete under dynamic load. To this end, concrete was considered as a threephase composite of mortar, aggregate and interfacial transition zone (ITZ) on the mesoscale. In light of the dynamic constitutive relation of concrete, the dynamic response of concrete specimens was numerically simulated on a 3D meso-mechanical model. Then, the authors discussed how the loading speed, aggregate volume content, and aggregate particle size affect the dynamic mechanical properties of concrete. The simulation results show that the damage morphology of concrete under dynamic load agrees well with that of theoretical analysis; the peak stress of concrete increased with the loading speed, revealing an obvious strain rate enhancement effect; the peak stress of concrete also increased with aggregate volume content; however, the peak stress of concrete gradually decreased with the increase in aggregate particle size under the constant volume content and grading of aggregate. The research findings shed new light on anti-impact design of concrete structures.