Experimental Behavior of GFRP Bar–Reinforced CFRP Strip Tie–Confined Normal-Strength Concrete Columns under Different Loading Conditions
Publication: Journal of Composites for Construction
Volume 27, Issue 2
Abstract
In this study, a total of 10 steel and glass fiber–reinforced polymer (GFRP) bar–reinforced normal strength concrete (NSC) specimens with a square cross section of 200 mm × 200 mm were experimentally tested up to failure under different loading conditions. Out of the 10 specimens, 8 specimens had a height of 800 mm and were tested as columns under concentric and eccentric axial loads. The remaining two specimens had a length of 1,500 mm and were tested as beams under four-point bending. The tested specimens were utilized to investigate the efficiency of carbon fiber–reinforced polymer (CFRP) strip ties (CSTs) in transversely confining NSC specimens. Two configurations of CSTs were used: a square (S) configuration and a square overlapping square (SS) configuration. The experimental results indicated that the peak axial load and ductility of the concentrically loaded GFRP bar–reinforced concrete specimens were lower than those of steel bar–reinforced specimens. The peak axial load and ductility of the concentrically loaded GFRP bar–reinforced concrete specimens with SS configuration were about 49% and 100%, respectively, higher than those of GFRP bar–reinforced concrete specimens with S configuration. Also, the GFRP bar–reinforced concrete specimens tested under eccentric loading and four-point bending achieved higher peak axial loads, flexural loads, and bending moments at the second peak loads than the corresponding steel bar–reinforced specimens.
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Acknowledgments
The first author acknowledges the joint support and funding from the Higher Education Commission (HEC) of Pakistan and the University of Wollongong, Australia. All authors acknowledge the technical support provided by the technical staff, especially Mr. F. Escribano of the high bay laboratory of the School of Civil, Mining and Environmental Engineering, University of Wollongong, Australia. The authors also acknowledge Pultron Composites (Mateenbar) and especially Mr. Ian Cumming of IRC Pvt. Ltd. for providing GFRP bars.
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Published In
Journal of Composites for Construction
Volume 27 • Issue 2 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 16, 2022
Accepted: Dec 6, 2022
Published online: Feb 14, 2023
Published in print: Apr 1, 2023
Discussion open until: Jul 14, 2023
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