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RISS 인기검색어
- 검색키워드
- 저자 : Kourosh Bagheri (검색결과 3 건)
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Sarfarazi, Vahab,Haeri, Hadi,Bagheri, Kourosh 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.4
In this paper, the effect of non-persistent joints was determined on the behavior of concrete specimens subjected to biaxial loading through numerical modeling using particle flow code in two dimensions (PFC2D). Firstly, a numerical model was calibrated by uniaxial, Brazilian and triaxial experimental results to ensure the conformity of the simulated numerical model's response. Secondly, sixteen rectangular models with dimension of 100 mm by 100 mm were developed. Each model contains two non-persistent joints with lengths of 40 mm and 20 mm, respectively. The angularity of the larger joint changes from $30^{\circ}$ to $90^{\circ}$. In each configuration, the small joint angularity changes from $0^{\circ}$ to $90^{\circ}$ in $30^{\circ}$ increments. All of the models were under confining stress of 1 MPa. By using of the biaxial test configuration, the failure process was visually observed. Discrete element simulations demonstrated that macro shear fractures in models are because of microscopic tensile breakage of a large number of bonded discs. The failure pattern in Rock Bridge is mostly affected by joint overlapping whereas the biaxial strength is closely related to the failure pattern.
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Vahab Sarfarazi,Hadi Haeri,Kourosh Bagheri 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.4
In this paper, the effect of non-persistent joints was determined on the behavior of concrete specimens subjected to biaxial loading through numerical modeling using particle flow code in two dimensions (PFC2D). Firstly, a numerical model was calibrated by uniaxial, Brazilian and triaxial experimental results to ensure the conformity of the simulated numerical model’s response. Secondly, sixteen rectangular models with dimension of 100 mm by 100 mm were developed. Each model contains two non-persistent joints with lengths of 40 mm and 20 mm, respectively. The angularity of the larger joint changes from 30° to 90°. In each configuration, the small joint angularity changes from 0° to 90° in 30° increments. All of the models were under confining stress of 1 MPa. By using of the biaxial test configuration, the failure process was visually observed. Discrete element simulations demonstrated that macro shear fractures in models are because of microscopic tensile breakage of a large number of bonded discs. The failure pattern in Rock Bridge is mostly affected by joint overlapping whereas the biaxial strength is closely related to the failure pattern.
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Simulation of the tensile behaviour of layered anisotropy rocks consisting internal notch
Vahab Sarfarazi,Hadi Haeri,P. Ebneabbasi,Kourosh Bagheri 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.1
In this paper, the anisotropy of tensile behaviours of layered rocks consisting internal notch has been investigated using particle flow code. For this purpose, firstly calibration of PFC2D was performed using Brazilian tensile strength. Secondly Brazilian test models consisting bedding layer was simulated numerically. Thickness of layers was 10 mm and layered angularity was 90°, 75°, 60°, 45°, 30°, 15° and 0°. The strength of bedding interface was too high. Each model was consisted of one internal notch. Notch length is 1 cm, 2 cm and 4 cm and notch angularities are 60°, 45°, 30°, 15° and 0°. Totally, 90 model were tested. The results show that failure pattern was affected by notch orientation and notch length. It’s to be noted that layer angle has not any effect on the failure pattern. Also, Brazilian tensile strength is affected by notch orientation and notch length.
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