Slender Steel Columns Strengthened Using High-Modulus CFRP Plates for Buckling Control
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VIEW CORRECTIONPublication: Journal of Composites for Construction
Volume 13, Issue 1
Abstract
This paper presents the results of an experimental investigation into the behavior of slender steel columns strengthened using high-modulus , carbon fiber-reinforced polymer (CFRP) plates. Eighteen slender hollow structural section square column specimens, , were concentrically loaded to failure. The effectiveness of CFRP was evaluated for different slenderness ratios , namely, 46, 70, and 93. The maximum increases in ultimate load ranged from 6 to 71% and axial stiffness ranged from 10 to 17%, respectively, depending on . As reduced, the effectiveness of CFRP plates also reduced, and failure mode changed from CFRP plate crushing after occurrence of overall buckling, to debonding prior to, or just at, buckling. A simplified analytical model is proposed to predict the ultimate axial load of FRP-strengthened slender steel columns, based on the ANSI/AISC 360-05 provisions, which were modified to account for the transformed section properties and a failure criteria of FRP derived from the experimental results. It was shown that for a given FRP reinforcement ratio, there is a critical at the low end, below which FRP may not enhance the strength of the column.
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Acknowledgments
The writers wish to acknowledge the Natural Sciences and Engineering Research Council of Canada (NSERC),NRC Sika Canada Inc., and Dave Tryon from Queen’s University.
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Published In
Journal of Composites for Construction
Volume 13 • Issue 1 • February 2009
Pages: 2 - 12
Copyright
© 2009 ASCE.
History
Received: Oct 19, 2007
Accepted: Jul 1, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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