Effect of Spiral Spacing and Concrete Strength on Behavior of GFRP-Reinforced Hollow Concrete Columns
Publication: Journal of Composites for Construction
Volume 24, Issue 1
Abstract
Hollow concrete columns (HCCs) are one of the preferred construction systems for bridge piers, piles, and poles because they require less material and have a high strength-to-weight ratio. While spiral spacing and concrete compressive strength are two critical design parameters that control HCC behavior, the deterioration of steel reinforcement is becoming an issue for HCCs. This study explored the use of glass fiber-reinforced polymer (GFRP) bars as longitudinal and lateral reinforcement for hollow concrete columns and investigated the effect of various spiral spacing and different concrete compressive strengths (). Seven HCCs with inner and outer diameters of 90 and 250 mm, respectively, and reinforced with six longitudinal GFRP bars, were prepared and tested. The spiral spacing was no spirals, 50, 100, and 150 mm; the varied from 21 to 44 MPa. Test results show that reducing the spiral spacing resulted in increased HCC uniaxial compression capacity, ductility, and confined strength due to the high lateral confining efficiency. Increasing , on the other hand, increased the axial-load capacity but reduced the ductility and confinement efficiency due to the brittle behavior of high compressive-strength concrete. The analytical models considering the axial load contribution of the GFRP bars and the confined concrete core accurately predicted the behavior of the HCCs after the spalling of the concrete cover or at the post-loading behavior.
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Acknowledgments
The authors are grateful to Pultrall Canada and Inconmat V-ROD Australia for providing the GFRP bars and spirals. The assistance of the postgraduate students and technical staff at the Centre of Future Materials (CFM) is also acknowledged. The first author is also grateful for the doctoral scholarship provided by Tafila Technical University (TTU) in Jordan.
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©2019 American Society of Civil Engineers.
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Received: Oct 3, 2018
Accepted: May 22, 2019
Published online: Oct 29, 2019
Published in print: Feb 1, 2020
Discussion open until: Mar 29, 2020
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