Behavior of Circular Reinforced-Concrete Columns Confined with Carbon Fiber–Reinforced Polymers under Cyclic Flexure and Constant Axial Load
Publication: Journal of Composites for Construction
Volume 20, Issue 3
Abstract
Deficient concrete-bridge columns can be effectively upgraded by bonding on the exterior surface fiber-reinforced polymer composite sheets with the fibers oriented in the columns’ circumferential direction, thus providing additional confinement. The efficiency of this rehabilitation method has been proven by the results of a number of cyclic loading tests performed on column specimens. The number of these tests, however, is much less than similar ones performed on reinforced-concrete columns without fiber-reinforced polymer confinement. This paper presents cyclic flexural test on reinforced-concrete columns confined with conventional circular hoops and carbon fiber–reinforced polymer and subjected to different axial-load levels. In addition to enriching the available database, the tests in this research program were programmed such that failure would occur in the composite sheets to validate an innovative stress-strain model that considers the passive confinement provided by both transverse-steel reinforcement and fiber-reinforced polymer wrapping. This experimental program includes eight circular reinforced-concrete columns having a 305 mm diameter and a height of 2 m. The parameters studied in this research program include the spacing of the hoops (75 or 150 mm), the intensity of the constant axial load (10 or 35% of the gross section capacity), and the presence of one or no carbon fiber–reinforced (CFRP) layer. The test results show that the addition of CFRP sheets enhances the behavior of the columns in terms of ductility and energy dissipation. The enhancement is more pronounced for the specimens with larger transverse steel–reinforcement spacing and lower axial-load level. The predictions of the moment-curvature show very good correlation with the measured responses.
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Acknowledgments
The authors would like to acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) for the Canadian Seismic Research Network (CSRN) under the Strategic Research Networks program, and the Fonds de recherche du Québec sur la nature et les technologies (FRQNT) for the financial support of the Centre d’études interuniversitaire des structures sous charges extrêmes (CEISCE). The authors would like to thank Sika-Canada for gracefully providing the CFRP sheets and the necessary bonding material.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 11, 2015
Accepted: Jul 27, 2015
Published online: Oct 14, 2015
Discussion open until: Mar 14, 2016
Published in print: Jun 1, 2016
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