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Structural Engineering and Mechanics   Volume 67, Number 5, September 2018, pages 505-516
Investigation of the effects of particle size and model scale on the UCS and shear strength of concrete using PFC2D
Hadi Haeri, Vahab Sarfarazi, Zheming Zhu and Hossein Ali Lazemi

Abstract     [Buy Article]
    In this paper, the effects of particle size and model scale of concrete has been investigated on the failure mechanism of PFC2D numerical models under uniaxial compressive test. For this purpose, rectangular models with same particle sizes and different model dimensions, i.e., 3 mmx6 mm, 6 mmx12 mm, 12 mmx24 mm, 25 mmx50 mm and 54 mmx108 mm, were prepared. Also rectangular models with dimension of 54 mmx108 mm and different particle sizes, i.e., 0.27 mm, 0.47 mm, 0.67 mm, 0.87 mm, 1.07 mm, 1.87 mm and 2.27 mm were simulated using PFC2D and tested under uniaxial compressive test. Concurrent with uniaxial test, direct shear test was performed on the numerical models. Dimension of the models were 75x100 mm. Two narrow bands of particles with dimension of 37.5 mmx20 mm were removed from upper and lower of the model to supply the shear test condition. The particle sizes in the models were 0.47 mm, 0.57 mm, 0.67 mm and 0.77 mm. The result shows that failure pattern was affected by model scale and particle size. The uniaxial compressive strength and shear strength were increased by increasing the model scale and particle size.
Key Words
    model scale; particle size; uniaxial compression test; direct shear test; PFC2D
Hadi Haeri and Zheming Zhu: College of Architecture and Environment, Sichuan University, Chengdu 610065, China
Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
Hossein Ali Lazemi: Department of Mining Engineering, Bafgh Branch, Islamic Azad University, Bafgh, Iran

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