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Structural Engineering and Mechanics Volume 85, Number 3, February10 2023 , pages 337-351 DOI: https://doi.org/10.12989/sem.2023.85.3.337 |
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Study on shear fracture behavior of soft filling in concrete specimens: Experimental tests and numerical simulation |
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Lei Zhou, Vahab Sarfarazi, Hadi Haeri, Amir Aslan Naderi, Mohammad Fatehi Marji and Fei Wu
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| Abstract | ||
| In this paper, the shear behavior of soft filling in rectangular-hollow concrete specimens was simulated using the 2D particle flow code (PFC2D). The laboratory-measured properties were used to calibrate some PFC2D micro-properties for modeling the behavior of geo-materials. The dimensions of prepared and modeled samples were 100 mmx100 mm. Some disc type narrow bands were removed from the central part of the model and different lengths of bridge areas (i.e., the distance between internal tips of two joints) with lengths of 30 mm, 50 mm, and 70 mm were produced. Then, the middle of the rectangular hollow was filled with cement material. Three filling sizes with dimensions of 5 mmx5 mm, 10 mmx5 mm, and 15 mmx5 mm were provided for different modeled samples. The parallel bond model was used to calibrate and re-produce these modeled specimens. Therefore, totally, 9 different types of samples were designed for the shear tests in PFC2D. The shear load was gradually applied to the model under a constant loading condition of 3 MPa (oc/3). The loading was continued till shear failure occur in the modeled concrete specimens. It has been shown that both tensile and shear cracks may occur in the fillings. The shear cracks mainly initiated from the crack (joint) tips and coalesced with another one. The shear displacements and shear strengths were both increased as the filling dimensions increased (for the case of a bridge area with a particular fixed length). | ||
| Key Words | ||
| bridge area; filling; PFC2D; rectangular-hollow concrete specimen; shear strength | ||
| Address | ||
| Lei Zhou: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, Sichuan,China; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Hadi Haeri: Department of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran Amir Aslan Naderi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Mohammad Fatehi Marji: Department of Mining Engineering, Yazd University, Yazd, Iran Fei Wu: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China | ||