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Proceedings Paper

Interfacial debonding in steel beams strengthened by externally bonded CFRP
Author(s): Jun Deng; Marcus M. K. Lee; Jian-he Xie; Pei-yan Huang
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Paper Abstract

The interfacial debonding at the plate ends is the most common failure mode in a carbon fibre reinforced polymer (CFRP) strengthened steel beam due to the high stress concentration there. This paper presents the results of a theoretical and experimental study on the interfacial debonding of the steel beams reinforced with CFRP plates. An analytical solution was developed to calculate the interfacial shear stress between the steel beam and the CFRP plate. The shear stress-slip relation of the bonding layer was simulated by a bilinear model. Three specimens were tested under threepoint bending. Two strain gauges were mounted at the ends of the plate bottom. If the effect of the spew fillet and the normal stress are ignored, the curves of strain recorded from the tests can be simplified to a bilinear model as well, which validates the theoretical results. When the strain is close to zero, the interfacial debonding initiated at the end of the plate. The agreement between the debonding loads obtained from the analytical solutions and the tests is good, which demonstrate that the presented analytical solution can predicate the debonding load correctly.

Paper Details

Date Published: 24 August 2009
PDF: 6 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73750Q (24 August 2009); doi: 10.1117/12.839032
Show Author Affiliations
Jun Deng, South China Univ. of Technology (China)
Marcus M. K. Lee, South China Univ. of Technology (China)
Univ. of Southampton (United Kingdom)
Jian-he Xie, South China Univ. of Technology (China)
Pei-yan Huang, South China Univ. of Technology (China)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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