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Structural Engineering and Mechanics Volume 18, Number 5, November 2004 , pages 541-563 DOI: https://doi.org/10.12989/sem.2004.18.5.541 |
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A trilinear stress-strain model for confined concrete |
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Alper Ilki, Nahit Kumbasar, Pinar Ozdemir and Toshibumi Fukuta
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| Abstract | ||
| For reaching large inelastic deformations without a substantial loss in strength, the potential plastic hinge regions of the reinforced concrete structural members should be confined by adequate transverse reinforcement. Therefore, simple and realistic representation of confined concrete behaviour is needed for inelastic analysis of reinforced concrete structures. In this study, a trilinear stress-strain model is proposed for the axial behaviour of confined concrete. The model is based on experimental work that was carried out on nearly full size specimens. During the interpretation of experimental data, the buckling and strain hardening of the longitudinal reinforcement are also taken into account. The proposed model is used for predicting the stress-strain relationships of confined concrete specimens tested by other researchers. Although the proposed model is simpler than most of the available models, the comparisons between the predicted results and experimental data indicate that it can represent the stress-strain relationship of confined concrete quite realistically. | ||
| Key Words | ||
| buckling; columns (supports); confined concrete; ductility; reinforcement; strength; stress-strain curves. | ||
| Address | ||
| Alper Ilki; Istanbul Technical University, Civil Engineering Faculty, Structural and Earthquake Engineering Laboratory, 34469, Maslak, Istanbul, Turkey Nahit Kumbasar; Istanbul Technical University, Civil Engineering Faculty, Reinforced Concrete Division, 34469, Maslak, Istanbul, Turkey Pinar Ozdemir; Istanbul Technical University, Civil Engineering Faculty, Mechanics Department, 34469, Maslak, Istanbul, Turkey Toshibumi Fukuta; Building Research Institute, Tsukuba, Japan | ||