Axial Load Behavior of Concrete Columns Confined with GFRP Spirals
Publication: Journal of Composites for Construction
Volume 17, Issue 3
Abstract
The writers evaluated the confinement that was provided by glass fiber-reinforced polymer (GFRP) spirals in concrete columns under axial load. Given that GFRP spirals are resistant to chloride-induced corrosion, the option of replacing steel spirals with GFRP spirals was explored to determine whether this would reduce the corrosion of the vertical steel bars in hybrid columns. The writers investigated the axial load behavior of 10 spirally reinforced concrete columns. Six of the 254-mm diameter columns were confined with a GFRP spiral and four were confined with a steel spiral. Some of the columns that were confined with a GFRP spiral utilized steel vertical bars (hybrid columns), whereas others utilized GFRP vertical bars (all-GFRP columns). The stress-strain and load-displacement behavior of all columns was studied. Analytical expressions predicted the axial load capacity of the hybrid and all-GFRP-reinforced concrete columns. Axial compression tests of all-steel-reinforced and hybrid specimens subjected to accelerated corrosion were also carried out. The latter exhibited a smaller corrosion rate, similar axial load capacity, and equal or higher ductility relative to steel corroded columns.
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Acknowledgments
The research was supported by the Utah DOT and New York State DOT. The writers acknowledge the contribution of Hughes Brothers Inc. and also acknowledge the assistance of Mark Bryant and Thomas Hales of the University of Utah.
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Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 3 • June 2013
Pages: 305 - 313
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 18, 2012
Accepted: Dec 28, 2012
Published online: Jan 2, 2013
Published in print: Jun 1, 2013
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