Performance of Mechanically Fastened FRP Strengthened Concrete Beams in Flexure
Publication: Journal of Composites for Construction
Volume 12, Issue 3
Abstract
The use of adhesively bonded fiber-reinforced polymer (FRP) materials has become widely accepted for use in flexural strengthening applications; however, the method of attachment presents drawbacks in application. These include extensive time and labor investments, as well as a tendency of the system to fail in a brittle manner. This paper presents a study of a series of reinforced concrete beams each strengthened in flexure with an FRP strip attached with large diameter concrete screws. The concrete screws were arranged in a variety of patterns. The effect of fastener number and spacing, as well as the effect of fastener pattern on the behavior of the beam, was investigated through the use of two groups of specimens. The beams in each group were tested to failure to verify the behavior of the strengthening system. Measured behavior was then used to determine an analytical approach for prediction of load response behavior of mechanically fastened systems. It was found that the strengthening method investigated improved the flexural capacity of the specimens 12 to 39% with little or no loss in ductility.
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Acknowledgments
The writers of this paper would like to thank the Powers Fasteners, Ramset/Redhead, and Strongwell Composites for the materials used in this study. The writers would also like to thank the help of Tulane University graduate and undergraduate students in their patient capacity as lab assistants and the Peter Kiewit Institute at the University of Nebraska Lincoln at the Omaha Campus for their generous hospitality and assistance during the Katrina Gap.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 3 • June 2008
Pages: 257 - 265
Copyright
© 2008 ASCE.
History
Received: Feb 3, 2006
Accepted: Dec 5, 2006
Published online: Jun 1, 2008
Published in print: Jun 2008
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