Seismic Behavior of Circular Concrete Columns Reinforced by Low Bond Ultrahigh Strength Rebars
Publication: Journal of Structural Engineering
Volume 149, Issue 9
Abstract
To develop a resilient reinforced concrete frame structure, the seismic performance of circular concrete columns reinforced by low bond ultrahigh strength (LBUS) rebars is investigated experimentally in this paper. Eight 1/3-scale circular columns with LBUS rebars confined by spirals or steel plates were tested. Compared with the columns with high strength reinforcements with a normal bond, the columns with LBUS rebars exhibited better seismic performance and higher self-centering regardless of their lateral confinement methods. This is explained by the strong restoring force provided by the ultrahigh steel rebars and the small physical damage of concrete surrounding LBUS rebars’ surface during large deformations. All the features reduce the degradation of the load-carrying capacity of the columns induced by the effect and serious spalling of concrete cover. Several models for predicting the hysteretic response and the energy dissipation capacity of the columns were proposed and their accuracy and reliability was presented by comparing them with their experimental results. The results prove that it is possible to achieve a resilient reinforced concrete (RC) column with a high self-centering capability up to the drift ratio of 3.0% using the LBUS rebars, after which the column’s load-carrying remains almost the same or continues to increase until a drift ratio of 5.0% is reached.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Author contributions: Y. P. Sun: conceptualization, methodology, reviewing, and supervision; and G. C. Cai: conceptualization, methodology, software, data curation, writing - original draft preparation, visualization, investigation, modelling, and writing- reviewing and editing.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 9 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 1, 2021
Accepted: May 15, 2023
Published online: Jul 11, 2023
Published in print: Sep 1, 2023
Discussion open until: Dec 11, 2023
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Cited by
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