Experimental Study of Normal- and High-Strength Concrete Confined with Fiber-Reinforced Polymers
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Volume 14, Issue 5
Abstract
The experimental program reported here was conducted to gain insight into the behavior of concrete confined with fiber-reinforced polymers (FRPs). A total of 112 cylindrical concrete specimens, each 150 mm in diameter, 300 mm in height, and concrete strength up to 112 MPa, were tested under monotonic uniaxial compression. Test variables included amount of FRP, strength and stiffness of FRP, concrete strength, and the health of concrete at the time of strengthening. Results showed that, with an increase of the unconfined concrete strength, the strength enhancement, energy absorption capacity, ductility factor, and work (energy) index at rupture of FRP jackets all decreased remarkably. A positive correlation was found between concrete ductility and FRP rupture strain. A gradual post-peak failure of the specimens, observed previously from FRP-confined concrete columns tested at the University of Toronto, was also observed in some of the current tests. This ductile failure, attributed to the gradual unzipping failure of FRP jacket, is related to specimen size and is explained in terms of various confinement parameters.
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Acknowledgments
The writers would like to express their gratitude to NSERC (the Natural Sciences and Engineering Research Council of Canada) and ISIS Canada (NSERC Network of Centers of Excellence on Intelligent Sensing for Innovative Structures) for financing this research work. The support of Fyfe Company who supplied fiber sheets and epoxy and the support of Nippon Oil Cooperation who supplied TU clothes are gratefully acknowledged. Experimental work was carried out at the Structures Laboratories of the Department of Civil Engineering at the University of Toronto.NSERC
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 5 • October 2010
Pages: 553 - 561
Copyright
© 2010 ASCE.
History
Received: Jun 28, 2009
Accepted: Feb 5, 2010
Published online: Feb 22, 2010
Published in print: Oct 2010
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