Bond Stress–Slip Model for Steel Bars in Unconfined or Steel, FRC, or FRP Confined Concrete under Cyclic Loading
Publication: Journal of Structural Engineering
Volume 135, Issue 5
Abstract
An experimentally based relationship of the cyclic local bond stress–slip response of steel bars corresponding to splitting mode of bond failure is developed. The relationship is composed of a monotonic envelope response and cyclic bond degrading response. The model accounts for both unconfined and moderately confined concrete and incorporates the effect of several critical bond parameters such as the diameter of steel bars, the ratio of concrete cover to bar diameter, the concrete compressive strength, the type of confinement such as steel ties, fiber-reinforced concrete (FRC), and fiber-reinforced polymer jackets, and the area or content of confining reinforcement. Results predicted by the model showed very good agreement with the test data. The bond–slip relationship can be utilized for evaluating the seismic behavior and bond degradation response of bond-critical regions in reinforced concrete members when confined internally with steel ties or fiber reinforced concrete or retrofitted using external FRP jackets.
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Acknowledgments
The research presented in this paper was supported by the Lebanese National Council for Scientific Research and the University Research Board of the American University of Beirut (AUB). The writer is most grateful for this support and to the Faculty of Engineering and Architecture at AUB for providing the laboratory facilities.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 5 • May 2009
Pages: 509 - 518
Copyright
© 2009 ASCE.
History
Received: Mar 12, 2007
Accepted: Nov 25, 2008
Published online: May 1, 2009
Published in print: May 2009
Notes
Note. Associate Editor: Yahya C. Kurama
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