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Mesoscopic numerical analysis of dynamic tensile fracture of recycled concrete

Liping Ying (Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing, China)
Yijiang Peng (Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing, China)
Mahmoud M.A. Kamel (Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing, China and Department of Civil Engineering, Faculty of Engineering, Fayoum University, Fayoum, Egypt)

Engineering Computations

ISSN: 0264-4401

Article publication date: 13 February 2020

Issue publication date: 21 May 2020

188

Abstract

Purpose

Based on the random aggregate model of recycled aggregate concrete (RAC), this paper aims to focus on the effect of loading rate on the failure pattern and the macroscopic mechanical properties.

Design/methodology/approach

RAC is regarded as a five-phase inhomogeneous composite material at the mesoscopic level. The number and position of the aggregates are modeled by the Walraven formula and Monte–Carlo stochastic method, respectively. The RAC specimen is divided by the finite-element mesh to establish the dynamic base force element model. In this model, the element mechanical parameters of each material phase satisfy Weibull distribution. To simulate and analyze the dynamic mechanical behavior of RAC under axial tension, flexural tension and shear tension, the dynamic tensile modes of the double-notched specimens, the simply supported beam and the L specimens are modeled, respectively. In addition, the different concrete samples are numerically investigated under different loading rates.

Findings

The failure strength and failure pattern of RAC have strong rate-dependent characteristics because of the inhomogeneity and the inertial effect of the material.

Originality/value

The dynamic base force element method has been successfully applied to the study of recycled concrete.

Keywords

Acknowledgements

This work is supported by National Science Foundation of China (10972015, 11172015), Beijing Natural Science Foundation (8162008).

Citation

Ying, L., Peng, Y. and Kamel, M.M.A. (2020), "Mesoscopic numerical analysis of dynamic tensile fracture of recycled concrete", Engineering Computations, Vol. 37 No. 6, pp. 1899-1922. https://doi.org/10.1108/EC-05-2019-0214

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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