Issue 45

F. Qui et alii, Frattura ed Integrità Strutturale, 45 (2018) 1-13; DOI: 10.3221/IGF-ESIS.45.01 1 Numerical simulation of dynamic mechanical properties of concrete based on 3D mesoscale model Fengyan Qin Architecture and Civil Engineering, West Anhui University, Lu'an 237012, China qinfengyan1207@163.com Jingsong Cheng, Heming Wen CAS Key Laboratory for Mechanical Behavior and Design of Materials University of Science and Technology of China, Hefei 230026, China hmwen@ustc.edu.cn Hongbo Liu School of Civil Engineering and Architecture, Heilongjiang University, Harbin 150080, China HLiu@ hlju.edu.cn A BSTRACT . This paper attempts to disclose the mechanical properties of concrete under dynamic load. To this end, concrete was considered as a three- phase 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. K EYWORDS . Concrete; Dynamic Mechanical Properties; 3D Meso-Mechanical Model; Dynamic Constitutive Relation; Numerical Simulation; Peak Stress. Citation : Qin, F., Cheng, J., Wen, H., Liu, H., Numerical simulation analysis of the dynamic mechanical property of concrete based on 3D meso-mechanical model, Frattura ed Integrità Strutturale, 45 (2018) 1-13. Received : 15.03.2018 Accepted : 02.06.2018 Published: 01.07.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.