Statistical Characterization of Reinforced Concrete Beams Strengthened with FRP Sheets
Publication: Journal of Composites for Construction
Volume 17, Issue 3
Abstract
This paper presents a comprehensive overview of the characteristics of reinforced concrete beams strengthened with fiber-reinforced polymer (FRP) sheets. A large database consisting of 230 test beams is constructed and analyzed using advanced statistical approaches such as multivariate analysis of variance, parameter estimation analysis, and discriminant analysis. Pearson correlation is conducted to identify linear dependency between test parameters. Parameters influencing debonding of the FRP are determined at a confidence level of 95%: concrete strength, steel reinforcement ratio, FRP thickness, and beam geometry. Transition of failure modes between FRP debonding and cover delamination is affected by FRP rupture strain and a steel reinforcement ratio. Discriminant functions are developed to infer the failure mode of FRP-strengthened beams. Existing design proposals for FRP debonding are evaluated using the test data. A new statistics-oriented equation is proposed to predict the effective strain of FRP-concrete interface on the basis of Monte-Carlo simulations associated with random sampling of contributing parameters.
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Acknowledgments
The experimental database used in this research has been provided by the Task Group on Bond of ACI Committee 440 (Fiber Reinforced Polymer Reinforcement). The authors gratefully acknowledge Dr. S. Hyun and Ms. S. Michael for their consultation of statistical analysis. The findings shown in this paper are those of the authors and do not necessarily represent the opinion of others.
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Published In
Journal of Composites for Construction
Volume 17 • Issue 3 • June 2013
Pages: 357 - 370
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 1, 2012
Accepted: Dec 20, 2012
Published online: Jan 5, 2013
Published in print: Jun 1, 2013
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