Seismic Performance of Concrete Columns Reinforced with Weakly Bonded Ultrahigh-Strength Longitudinal Bars
Publication: Journal of Structural Engineering
Volume 147, Issue 1
Abstract
This paper presents an investigation of the seismic performance of concrete columns reinforced longitudinally with steel bars (referred to as UHS-WB bars) that have an ultrahigh strength and a low bond strength. Nine cantilever columns were tested with variables including the type of longitudinal steel reinforcement, the anchorage method for the UHS-WB bars, the axial load ratio, and the shear-span ratio of the columns. The columns with securely anchored UHS-WB bars and shear-span ratios of 2.5 and 3.0 exhibited very stable hysteretic behavior and a mild hardening postyield behavior up to drift ratio of 4%, whereas the lateral resistance of the column with a shear-span ratio of 4.0 had a slight decline beyond a drift ratio of 1.5% due to significant effect. However, all the columns with securely anchored UHS-WB bars had a residual drift less than 0.5% after unloading from the drift of 3%. The stable response and low residual drift can be attributed to the low bond strength, which delayed the yielding of the UHS-WB bars.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was partially supported by JSPS Grant No. R2904 under the Program for Fostering Globally Talented Researchers. The high-strength bars were provided by JFE Techno-wire, Neturen, and Tokyo Rope MFG. Their support is gratefully acknowledged. However, opinions expressed in this paper are those of the authors and do not necessarily reflect those of the sponsors.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 15, 2020
Accepted: Aug 23, 2020
Published online: Oct 20, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 20, 2021
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