Seismic Behavior of Square and Circular Concrete Columns with GFRP Reinforcement
Publication: Journal of Composites for Construction
Volume 24, Issue 1
Abstract
This paper presents results from tests on seven reinforced concrete square columns under simulated seismic loading and demonstrates their satisfactory behavior even when axial load is high. All seven specimens were confined by glass fiber–reinforced polymer reinforcement (GFRP) rectilinear ties, while five specimens were reinforced with steel longitudinal bars and two with GFRP longitudinal bars. The results showed that irrespective of the longitudinal bar type, GFRP confinement effectively improved the seismic resistance of columns. The difference in the type of the longitudinal bars resulted in significant changes in column behavior. A comparison was made between these test specimens and earlier circular columns from literature, and the confinement effectiveness of the GFRP rectilinear ties and circular spirals was evaluated. Lateral GFRP was found to have a greater influence on the flexural strength enhancement of columns with GFRP longitudinal bars versus steel longitudinal bars. Results indicate that available methods for predicting flexural strength enhancement due to confinement invariably miscalculated the true strength enhancement by a substantial margin, particularly when GFRP longitudinal bars are used. A new model for predicting the flexural strength enhancement of square and circular columns confined by lateral GFRP is proposed.
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Acknowledgments
The authors would like to acknowledge their gratitude and sincere appreciation to the sponsors of this research program for their support. These include Fiberline Composites of Canada, Schoeck Canada, Dufferin Concrete, Facca, and Fyfe. Additionally, the financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the India–Canada Centre for Innovative Multidisciplinary Partnerships to Accelerate Community Transformation and Sustainability (IC-IMPACTS), an NSERC Network of Centers of Excellence is gratefully acknowledged. The experimental work was carried out in the Structures Laboratories of University of Toronto.
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Journal of Composites for Construction
Volume 24 • Issue 1 • February 2020
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©2019 American Society of Civil Engineers.
History
Received: Feb 13, 2018
Accepted: Jun 4, 2019
Published online: Nov 30, 2019
Published in print: Feb 1, 2020
Discussion open until: Apr 30, 2020
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