Performance Enhancement of Steel Columns Using Concrete-Filled Composite Jackets
Publication: Journal of Performance of Constructed Facilities
Volume 25, Issue 3
Abstract
This paper studies the cross-sectional behavior of steel columns strengthened with fiber-reinforced polymers (FRPs). The composite column is constructed by wrapping the steel I-section column with epoxy-saturated glass- and carbon-FRPs (GFRP and CFRP) sheets in the transverse direction and subsequently filling the voids between the FRP and the steel with concrete. Experimental tests were performed on stub columns under axial compression including one to three CFRP wraps. A corner treatment technique, to avoid stress concentration at the corners and to improve confinement efficiency, was also investigated. A simplified analytical model was developed to predict the axial behavior of the composite columns. Experimental results showed significant enhancement in the behavior of the composite columns primarily attributable to the confinement mechanism imposed by the FRP jacket and concrete. Increasing the corner radius resulted in higher compressive strength of the confined concrete and ultimate axial strain of the composite columns. Good agreement between the analytically developed axial load-displacement relationships and the test data indicates that the model can closely simulate the cross-sectional behavior of the composite columns.
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Acknowledgments
This study was carried out as part of ongoing research at McMaster University Centre for Effective Design of Structures funded through Ontario Research and Development Challenge Fund of the Ministry of Research and Innovation. Funding was also provided by Natural Sciences and Engineering Research Council of Canada (NSERC). The writers would like to gratefully acknowledge Fyfe.Co. LLC for providing the FRP materials.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 25 • Issue 3 • June 2011
Pages: 189 - 201
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 9, 2010
Accepted: Jul 11, 2010
Published online: Jul 31, 2010
Published in print: Jun 1, 2011
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