Bond Performance of GFRP Bars in Tension: Experimental Evaluation and Assessment of ACI 440 Guidelines
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
The development/splice strength and the pullout local bond stress-slip response of glass fiber-reinforced polymer (GFRP) bars in tension were experimentally investigated using beam specimens and pullout specimens, respectively. Two types of 12-mm (0.47-in.)-diameter GFRP bars were evaluated, namely, thread wrapped and ribbed. The test parameters included the concrete cover, the splice length, and the area of steel confinement for the beam specimens, and the concrete compressive strength for the pullout specimens. Companion steel reinforced beams were also tested for comparison. All beam specimens reinforced with thread-wrapped GFRP bars experienced pullout mode of bond failure, while all specimens reinforced with ribbed GFRP bars or steel bars experienced splitting mode of bond failure. It was found that the bond strength of FRP bars is largely dependent on the surface conditions of the bars. The pullout local bond stress-slip response of ribbed GFRP bars is intrinsically similar to that of steel bars reported in the literature. The bond strength of both types of GFRP bars investigated was about two to three times lower than that of steel bars. Predictions of the development/splice strength of GFRP bars in accordance with the ACI Committee 440 guidelines were unconservative in comparison with the test data. Also, in contradiction with the current ACI 440 report, the use of transverse confining reinforcement increased the bond strength by a sizable 15–30%.
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Acknowledgments
This research was supported by the Lebanese National Council for Scientific Research and the University Research Board of the American University of Beirut (AUB). The writers are grateful for that support and to the Faculty of Engineering and Architecture at AUB for providing the test facilities.UNSPECIFIEDUNSPECIFIED
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 659 - 668
Copyright
© 2010 ASCE.
History
Received: Jul 13, 2009
Accepted: Apr 29, 2010
Published online: May 7, 2010
Published in print: Dec 2010
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