Experimental Investigation of Bond between High-Modulus CFRP and Steel at Moderately Elevated Temperatures
Publication: Journal of Composites for Construction
Volume 20, Issue 6
Abstract
This paper presents the findings of a research study that was conducted to assess the effect of moderately elevated temperatures, up to 50°C, on the bond behavior of steel beams strengthened with externally bonded high-modulus carbon-fiber-reinforced polymer (CFRP) plates. In the first phase of the testing, seven steel-CFRP bonded double-lap shear coupons were tested at different temperatures to characterize the bond behavior. In the second phase of testing, steel beams were strengthened with different lengths of high-modulus CFRP plates and loaded under four-point bending at 25, 40, and 50°C. The test results indicate that the debonding load of bonded joints at 50°C is between 56 and 116% greater than the debonding load of similar joints at 25°C for the specific system tested in this study. This increase was attributed to an increase of the toughness of the tested adhesive at 50°C despite the lower tensile strength and stiffness of the material. The research findings suggest that the proposed strengthening system for steel beams is suitable for application at service temperatures up to 50°C.
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Acknowledgments
The first author gratefully acknowledges the financial support provided by the Petroleum Pipeline Corporation (BOTAS). The authors also acknowledge the support provided through the University of Houston Small Grants Program and the Department of Civil and Environmental Engineering and the in-kind contributions provided by Mitsubishi Plastics Composites America, Inc.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 20 • Issue 6 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 9, 2015
Accepted: Feb 8, 2016
Published online: May 3, 2016
Discussion open until: Oct 3, 2016
Published in print: Dec 1, 2016
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