Bond of GFRP Bars in Concrete: Experimental Study and Analytical Interpretation
Publication: Journal of Composites for Construction
Volume 10, Issue 5
Abstract
The local bond mechanics of glass-fiber reinforced polymer (GFRP) bars in normal strength concrete was investigated through experimental testing and analytical modeling. The experimental program was comprised of 30 direct tension pullout specimens with short anchorages. A novel test setup, specially designed so as to minimize the spurious influence of testing conditions on measured bond properties was adopted in the study. Parameters considered were the bar roughness and diameter, the size effect expressed by the constant cover to bar diameter ratio, and the external confining pressure exerted over the anchorage length by transverse externally bonded FRP sheets. Results of the study were summarized in the form of local bond-slip curves, whereby performance limit states were quantified by the amount of loaded end slip and bond strength. An analytical model of the bond stress-slip response of a GFRP bar was derived from first principles and calibrated against the test data of the present investigation. Using the calibrated model, design values for bond and slip were estimated with reference to the code limit state model for bond.
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Acknowledgments
Funding for this investigation was provided by the Hellenic General Secretariat for Research and Technology, Greece. Tests were conducted in the Laboratory of Reinforced Concrete, Department of Civil Engineering, Democritus University, Greece. The composite materials were generously donated by MAC BETON HELLAS S.A, SIKA Hellas and Concrete Protection Products Inc. Asl bars were purchased from Hughes Brothers Inc.
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Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 5 • October 2006
Pages: 381 - 391
Copyright
© 2006 ASCE.
History
Received: Sep 15, 2005
Accepted: Dec 16, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
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