Bar Buckling in RC Columns Confined with Composite Materials
Publication: Journal of Composites for Construction
Volume 15, Issue 3
Abstract
The onset and evolution of bar buckling at the plastic hinge of old-type reinforced concrete (RC) columns confined with composite material [fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM)] jackets was investigated experimentally and analytically in this study. The interaction between composite jacket (or concrete cover, for unconfined concrete) and embedded longitudinal compression reinforcement at the onset and evolution of bar buckling was achieved through strain measurements of the compression reinforcement. Moreover, the implementation of a recent stress-strain confinement model, which relates lateral with axial strains, allowed the description and monitoring of the axial-lateral strain relationship at the base of the columns throughout the evolution of bar buckling. Based on the aforementioned model and the experimental measurements, the postbuckling behavior of columns was related to the jacket stiffness. Finally, a semiempirical expression that gives the drift ratio of RC columns at the onset of bar buckling was modified herein for the case of FRP- or TRM-jacketed columns.
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Acknowledgments
The writers wish to thank Assistant Professor C. Papanicolaou for her assistance in the experimental program. The work reported in this paper was funded by the Greek General Secretariat for Research and Technology through the project ARISTION, within the framework of the program “Built Environment and Management of Seismic Risk.”
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Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 3 • June 2011
Pages: 393 - 403
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 7, 2010
Accepted: Oct 5, 2010
Published online: Oct 9, 2010
Published in print: Jun 1, 2011
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