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Structural Engineering and Mechanics Volume 66, Number 5, June10 2018 , pages 569-582 DOI: https://doi.org/10.12989/sem.2018.66.5.569 |
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Experimental and numerical simulating of the crack separation on the tensile strength of concrete |
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Vahab Sarfarazi, Hadi Haeri, Alireza Bagher Shemirani, Zheming Zhu and Mohammad Fatehi Marji
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| Abstract | ||
| Effects of crack separation, bridge area, on the tensile behaviour of concrete are studied experimentally and numerically through the Brazilian tensile test. The physical data obtained from the Brazilian tests are used to calibrate the two-dimensional particle flow code based on discrete element method (DEM). Then some specially designed Brazilian disc specimens containing two parallel cracks are used to perform the physical tests in the laboratory and numerically simulated to make the suitable numerical models to be tested. The experimental and numerical results of the Brazilian disc specimens are compared to conclude the validity and applicability of these models used in this research. Validation of the simulated models can be easily checked with the results of Brazilian tests performed on non-persistent cracked physical models. The Brazilian discs used in this work have a diameter of 54 mm and contain two parallel centred cracks (90o to the horizontal) loaded indirectly under the compressive line loading. The lengths of cracks are considered as; 10 mm, 20 mm, 30 mm and 40 mm, respectively. The visually observed failure process gained through numerical Brazilian tests are found to be very similar to those obtained through the experimental tests. The fracture patterns demonstrated by DEM simulations are mostly affected by the crack separation but the tensile strength of bridge area is related to the fracture pattern and failure mechanism of the testing samples. It has also been shown that when the crack lengths are less than 30 mm, the tensile cracks may initiate from the cracks tips and propagate parallel to loading direction till coalesce with the other cracks tips while when the cracks lengths are more than 30 mm, these tensile cracks may propagate through the intact concrete itself rather than that of the bridge area. | ||
| Key Words | ||
| experimental tests; discrete element method; Brazilian discs; non-persistent cracks; crack separation | ||
| Address | ||
| Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Hadi Haeri: Young Researchers and Elite Club, Bafgh Branch, Islamic Azad University, Bafgh, Iran Alireza Bagher Shemirani: Department of Civil Engineering, Sadra Institute of Higher Education, Tehran, Iran Zheming Zhu: College of Architecture and Environment, Sichuan University, Chengdu 610065, China Mohammad Fatehi Marji: Mine Exploitation Engineering Department, Faculty of Mining and Metallurgy, Institution of Engineering, Yazd University, Yazd, Iran | ||