Axial and Flexural Behavior of High-Strength Concrete Square Columns Laterally Reinforced with a New System of CFRP Tube Ties
Publication: Journal of Composites for Construction
Volume 26, Issue 3
Abstract
Conventional fiber-reinforced polymer (FRP) bar ties in square FRP-reinforced concrete (FRP-RC) columns provide low strength and ductility. This is due to the lower ultimate tensile strength at the bent sections (corner) than at the straight sections of the conventional FRP bar ties. To overcome this problem, a new system of carbon-FRP (CFRP) tube ties was developed and its applicability was investigated in high-strength concrete (HSC) square columns. Hence, this study experimentally investigated the axial and flexural behaviors of the HSC specimens reinforced longitudinally with glass-FRP (GFRP) bars and laterally with CFRP tube ties (CFRP-TTs). The effect of CFRP-TTs on the behavior of GFRP bar–reinforced HSC specimens was investigated in terms of strength development and failure pattern under different loading conditions (concentric, 25- and 50-mm eccentric axial loadings, and four-point bending). The experimental results of the GFRP bar–reinforced HSC specimens laterally reinforced with CFRP-TTs (Group GC specimens) were compared with the steel bar–reinforced HSC specimens laterally reinforced with steel ties (Group SS specimens). The test results showed that the better confinement offered by the CFRP-TTs in the Group GC specimens resulted in higher axial load and bending moment capacity than in Group SS specimens under concentric, 25-mm eccentric axial loading, and four-point bending conditions.
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Acknowledgments
The authors express their sincere gratitude to the technical officers at UOW, Australia, especially to Ritchie McLean, Travis Marshall, and Jordan Wallace, for their technical support and timely casting and testing of the specimens. This study is a part of Ph.D. research, jointly supported by the University of Wollongong (UOW), Australia, and the Higher Education Commission (HEC), Government of Pakistan. Therefore, the first author acknowledges the administration of the UOW and the HEC for the support of his full Ph.D. scholarship. The authors also acknowledge Pultron Composites (Mateenbar 2021) for providing the GFRP bars.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 3 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 13, 2021
Accepted: Jan 7, 2022
Published online: Mar 11, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 11, 2022
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Cited by
- Muhammad Ayoub, Hayder Alaa Hasan, M. Neaz Sheikh, Muhammad N. S. Hadi, Experimental Behavior of GFRP Bar–Reinforced CFRP Strip Tie–Confined Normal-Strength Concrete Columns under Different Loading Conditions, Journal of Composites for Construction, 10.1061/JCCOF2.CCENG-4056, 27, 2, (2023).
- Muhammad Ayoub, M. Neaz Sheikh, Muhammad N. S. Hadi, Investigation of the Effectiveness of CFRP Strip Ties as Transverse Reinforcement for GFRP Bar–Reinforced Concrete Columns, Journal of Composites for Construction, 10.1061/(ASCE)CC.1943-5614.0001249, 26, 5, (2022).