Confinement Model for Concrete Columns Internally Confined with Carbon FRP Spirals and Hoops
Publication: Journal of Structural Engineering
Volume 141, Issue 9
Abstract
Recent years have seen valuable research work and widespread applications of fiber-reinforced polymer (FRP) bars as flexural and shear reinforcement for concrete structures. Nonetheless, the axial compression behavior of FRP reinforced concrete (RC) columns has not yet been defined. This study introduces equations and a confinement model to predict the stress-strain envelope responses of RC columns reinforced with carbon-FRP bars (CFRP) and confined by CFRP spirals or hoops. The model takes into account the effect of many parameters such as transverse reinforcement configuration, longitudinal reinforcement ratio, volumetric ratio, and the size and spacing of spirals or hoops. Results of analysis using the proposed confinement model were verified by means of a series of experiments with full-scale circular CFRP-RC columns. The proposed equations have been shown to predict accurately confined concrete core stress, corresponding concrete strain, and prepeak and postpeak stress-strain relationships for the tested CFRP-RC column specimens.
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Acknowledgments
The authors would like to express their special thanks and gratitude to the Natural Science and Engineering Research Council of Canada (NSERC), the Fonds de recherche du Québec—Nature et Technologies—(FQRNT), the Canadian Foundation for Innovation (FCI), and the technical staff of the structural lab of the Department of Civil Engineering at the University of Sherbrooke.
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© 2014 American Society of Civil Engineers.
History
Received: Feb 19, 2014
Accepted: Sep 25, 2014
Published online: Oct 16, 2014
Discussion open until: Mar 16, 2015
Published in print: Sep 1, 2015
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