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http://dx.doi.org/10.12989/sem.2018.66.3.343

A fracture mechanics simulation of the pre-holed concrete Brazilian discs  

Sarfarazi, Vahab (Department of Mining Engineering, Hamedan University of Technology)
Haeri, Hadi (Young Researchers and Elite Club, Bafgh Branch, Islamic Azad University)
Shemirani, Alireza Bagher (Department of Civil Engineering, Sadra Institute of Higher Education)
Nezamabadi, Maryam Firoozi (Department of Civil Engineering, South Tehran Branch, Islamic Azad University)
Publication Information
Structural Engineering and Mechanics / v.66, no.3, 2018 , pp. 343-351 More about this Journal
Abstract
Brazilian disc test is one of the most widely used experiments in the literature of geo-mechanics. In this work, the pre-holed concrete Brazilian disc specimens are numerically modelled by a two-dimensional discrete element approach. The cracks initiations, propagations and coalescences in the numerically simulated Brazilian discs (each containing a single cylindrical hole and or multiple holes) are studied. The pre-holed Brazilian discs are numerically tested under Brazilian test conditions. The single-holed Brazilian discs with different ratios of the diameter of the holes to that of the disc radius are modelled first. The breakage load in the ring type disc specimens containing an internal hole with varying diameters is measured and the crack propagation mechanism around the wall of the ring is investigated. The crack propagation and coalescence mechanisms are also studied for the case of multi-holes' concrete Brazilian discs. The numerical and experimental results show that the breaking mechanism of the pre-holed disc specimens is mainly due to the initiation of the radially induced tensile cracks which are growth from the surface of the central hole. Radially cracks propagated toward the direction of diametrical loading. It has been observed that for the case of disc specimens with multiple holes under diametrical compressive loading, the breaking process of the modelled specimens may occur due to the simultaneous cracks propagation and cracks coalescence phenomena. These results also show that as the hole diameter and the number of the holes increases both the failure stress and the crack initiation stress decreases. The experimental results already exist in the literature are quit agree with the proposed numerical simulation results which validates this simulation procedure.
Keywords
concrete rings; pre-holed Brazilian discs; crack analyses; cracks coalescence; discrete element method;
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Times Cited By KSCI : 10  (Citation Analysis)
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