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Structural Engineering and Mechanics Volume 21, Number 6, December20 2005 , pages 737-765 DOI: https://doi.org/10.12989/sem.2005.21.6.737 |
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Partially confined circular members subjected to axial compression: Analysis of concrete confined by steel ties |
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R. Eid and A. N. Dancygier
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| Abstract | ||
| This paper presents a theoretical model for the behavior of partially confined axi-symmetric reinforced concrete members subjected to axial load. The analysis uses the theories of elasticity and plasticity to cover the full range of the concrete behavior. Analysis of the elastic range of the problem involves boundary conditions that are defined along a relatively simple geometry. However, extending the analysis into the plastic range involves difficulties that arise from the irregular geometry of the boundary between the plastic zone and the elastic zone, a boundary which is also changing as the axial load increases. The solution is derived by replacing the discrete steel ties with an equivalent tube of thickness teq and by analyzing the concrete cylinder, which is uniformly confined by the equivalent tube. The equivalency criterion initiates from a theoretical analysis of the problem in its elastic range where further finite element analysis shows that this criterion is valid also for the plastic range of the cylinder material. According to the proposed model, the efficiency of the lateral reinforcement can be evaluated by the equivalent thickness teq. Comparison with published test results of confined reinforced concrete stress-strain curves shows good agreement between the test and the analytical results. | ||
| Key Words | ||
| confined concrete; steel ties; plasticity. | ||
| Address | ||
| R. Eid; Department of Civil Engineering, University of Sherbrooke, Sherbrooke, Quebec, Canada J1J 2R1 A. N. Dancygier; National Building Research Institute, Department of Structural Engineering and Construction Management, Faculty of Civil and Environmental Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel | ||