Hybrid Use of Externally Embedded FRP Reinforcement for Seismic Retrofitting of Substandard RC Columns
Publication: Journal of Composites for Construction
Volume 27, Issue 3
Abstract
This paper discussed the effectiveness of the hybrid use of fiber-reinforced polymer (FRP) reinforcement for the seismic retrofitting of substandard reinforced concrete (RC) columns. Four columns, except for the reference, were retrofitted with externally embedded FRP (EE–FRP) bars in a longitudinal and external FRP jacket in the transverse directions. The test parameter was the configuration of the FRP bars that were used for retrofitting along the longitudinal direction (e.g., single or hybrid use of different types of FRP bars, such as aramid (AFRP), glass (GFRP), or carbon fiber–reinforced polymers (CFRP). The test results indicated that a significant enhancement in the lateral load capacity (≤198% in the unstrengthened column) could be achieved through the hybrid use of FRP bars under reversed cyclic lateral displacement and a constant axial load without a significant sacrifice in deformability. In addition, the test results yielded insights into the strain (ɛ) capacities of longitudinal FRP bars in tension and their contribution to compression resistance under reversed cyclic lateral loading conditions. In addition, an analytical study was conducted to predict the cyclic flexural behavior in substandard RC columns that were retrofitted through the single or hybrid use of EE–FRP bars that considered the debonding behavior of longitudinal CFRP bars with a smooth surface.
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Acknowledgments
The financial support of the ITU Scientific Research Department (Scientific Research Project No:326024), Master Builders Solutions, OTS Engineering Company, and the assistance of the staff of the Structural and Earthquake Engineering Laboratory and Building Materials Laboratory of Istanbul Technical University are gratefully acknowledged. The authors are also thankful for the support of MSc. A. Uzunhasanoglu.
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Journal of Composites for Construction
Volume 27 • Issue 3 • June 2023
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© 2023 American Society of Civil Engineers.
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Received: Jan 25, 2022
Accepted: Dec 23, 2022
Published online: Feb 24, 2023
Published in print: Jun 1, 2023
Discussion open until: Jul 24, 2023
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