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Computers and Concrete Volume 21, Number 2, February 2018 , pages 189-197 DOI: https://doi.org/10.12989/cac.2018.21.2.189 |
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A discrete element simulation of a punch-through shear test to investigate the confining pressure effects on the shear behaviour of concrete cracks |
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Alireza Bagher Shemirani, Vahab Sarfarazi, Hadi Haeri, Mohammad Fatehi Marji and Seyed shahin Hosseini
Vahab Sarfarazi:
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| Abstract | ||
| A discrete element approach is used to investigate the effects of confining stress on the shear behavior of joint\'s bridge area. A punch-through shear test is used to model the concrete cracks under different shear and confining stresses. Assuming a plane strain condition, special rectangular models are prepared with dimension of 75 mmx100 mm. Within the specimen model and near its four corners, four equally spaced vertical notches of the same depths are provided so that the central portion of the model remains intact. The lengths of notches are 35 mm. and these models are sequentially subjected to different confining pressures ranging from 2.5 to 15 MPa. The axial load is applied to the punch through the central portion of the model. This testing and models show that the failure process is mostly governed by the confining pressure. The shear strengths of the specimens are related to the fracture pattern and failure mechanism of the discontinuities. The shear behaviour of discontinuities is related to the number of induced shear bands which are increased by increasing the confining pressure while the cracks propagation lengths are decreased. The failure stress and the crack initiation stress both are increased due to confining pressure increase. As a whole, the mechanisms of brittle shear failure changes to that of the progressive failure by increasing the confining pressure. | ||
| Key Words | ||
| punch-through shear test; confining pressure; shear and tensile cracks; discrete element method | ||
| Address | ||
| Alireza Bagher Shemirani: Department of Civil Engineering, Sadra Institute of Higher Education, Tehran Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan Hadi Haeri: Young Researchers and Elite Club, Bafgh Branch, Islamic Azad University, Bafgh, Iran Mohammad Fatehi Marji: Head of Mine Exploitation Engineering Department, Faculty of Mining and Metallurgy, Institution of Engineering, Yazd University, Yazd, Iran Seyed shahin Hosseini: Department of Civil Engineering, Aria University of Sciences and Sustainability, Tehran, Iran | ||