Seismic Performance of Square Concrete Columns Confined with Glass Fiber–Reinforced Polymer Ties
Publication: Journal of Composites for Construction
Volume 22, Issue 6
Abstract
This paper assesses the seismic response of square concrete columns internally confined with glass fiber–reinforced polymers (GFRP). Tests were conducted under simulated earthquake loads on eight full-scale columns reinforced with GFRP rectilinear ties and steel longitudinal bars. Shear versus deflection and moment versus curvature responses along with various ductility parameters were used to evaluate the performance of the columns. Results showed that the GFRP ties provide effective confinement to the concrete core until a rupture strain much larger than the steel yield strain. The influence of tie configuration on specimen behavior was found to be significant. An approximately 4% ultimate drift ratio was observed for properly confined columns tested under axial load of 42% of the column axial load capacity. The current design code provisions and guidelines for GFRP ties were found to be ambiguous and lacking in several aspects; suggestions are made for improvement.
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Acknowledgments
The authors would like to acknowledge their gratitude and appreciation for the materials support received from Fiberline Composite Inc., Schoeck Canada Inc., and Dufferin Concrete for this research. The financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC) and IC-IMPACTS, NSERC Network of Centers of Excellence is gratefully acknowledged. The experimental work was carried out in the Structures Laboratories of the University of Toronto.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 22 • Issue 6 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 21, 2017
Accepted: May 21, 2018
Published online: Sep 21, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 21, 2019
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