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Computers and Concrete Volume 21, Number 2, February 2018 , pages 219-229 DOI: https://doi.org/10.12989/cac.2018.21.2.219 |
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A modified RBSM for simulating the failure process of RC structures |
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Chao Zhao, Xingu Zhong, Bo Liu, Xiaojuan Shu and Mingyan Shen
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| Abstract | ||
| In this paper, a modified rigid body spring model (RBSM) is proposed and used to analyze the damage and failure process of reinforced concrete (RC) structures. In the proposed model, the concrete is represented by an assembly of rigid blocks connected with a uniform distribution of normal and tangential springs to simulate the macroscopic mechanical behavior of concrete. Steel bars are evenly dispersed into rigid blocks as a kind of homogeneous axial material, and an additional uniform distribution of axial and dowel springs is defined to consider the axial stiffness and dowel action of steel bars. Perfect bond between the concrete and steel bars is assumed, and tension stiffening effect of steel bars is modeled by adjusting the constitutive relationship for the tensile reinforcement. Adjacent blocks are allowed to separate at the contact interface, which makes it convenient and easy to simulate the cracking process of concrete. The failure of the springs is determined by the Mohr-Coulomb type criterion with the tension and compression caps. The effectiveness of the proposed method is confirmed by elastic analyses of a cantilever beam under different loading conditions and failure analyses of a RC beam under two-point loading. | ||
| Key Words | ||
| reinforced concrete structures; failure process; rigid body spring model; cracks; bearing capacity | ||
| Address | ||
| Chao Zhao, Xingu Zhong, Bo Liu: School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Ding No.11 Xueyuan Road, Haidian District, Beijing, China Xiaojuan Shu, Mingyan Shen : School of Civil Engineering, Hunan University of Science and Technology, Taoyuan Road, Yuhu District, Xiangtan, China | ||