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Modelling of the fracture process zone to improve the crack propagation criterion in concrete


Citation

Shahbazpanahi, Shahriar and Abang Ali, Abang Abdullah and Abd.Aziz, Farah Nora Aznieta and Kamgar, Alaleh and Farzadnia, Nima (2013) Modelling of the fracture process zone to improve the crack propagation criterion in concrete. Journal of the South African Institution of Civil Engineering, 55 (3). pp. 2-9. ISSN 1021-2019

Abstract

Modelling of tension cracking in quasi-brittle materials, such as concrete, plays an important role in improving the reliability and load-bearing capacity of the structure. In this study fracture mechanics is used to model tensile cracks with strain softening behaviour in concrete. An interface element, which considers the softening zone in terms of a stiffness matrix, is applied to simulate the cohesive zone model (CZM) as well as the stress-free region. To estimate the nodal force caused by shear stress, a new constitutive model is proposed based on previous experimental results. An improved Griffith-type energy approach is employed such that it can model the propagation of a discrete crack based on an accurate stiffness matrix. This model improves the analysis of discrete crack propagation and is more accurate than other existing models. To validate the model, three benchmark beams are simulated, namely a plain concrete beam with initial notch, a notched reinforced concrete beam and a beam with simple supports. The simulation results are admissible compared to the results reported recently in the literature.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Publisher: South African Institution of Civil Engineering
Keywords: Cohesive; Crack; Energy; Model; Stiffness
Depositing User: Nabilah Mustapa
Date Deposited: 27 Apr 2015 08:04
Last Modified: 28 Jan 2016 04:45
URI: http://psasir.upm.edu.my/id/eprint/28666
Statistic Details: View Download Statistic

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