Seismic Performance of Circular Concrete Columns Reinforced with High-Strength Steel
Publication: Journal of Structural Engineering
Volume 146, Issue 2
Abstract
In modern seismic design of reinforced concrete structures, areas designed to form plastic hinges are reinforced with ASTM A706 steel because of its ability to sustain large elongations, as well as its tightly controlled specifications on yield and ultimate strength. The A706 standard now includes reinforcing steel with a nominal yield strength of 550 MPa (80 ksi), but its use in seismic applications is limited given the lack of experimental data on its behavior in members forming plastic hinges. In this paper, the results of four circular Grade 80 (550) reinforced columns tested under reverse cyclic loading are discussed and compared with companion Grade 60 (420) reinforced columns. The results showed that columns reinforced with Grade 80 (550) steel exhibited rebar fracture at lower levels of column deformation, although the onset of bar buckling, plastic hinge lengths, and energy dissipation were similar to columns reinforced with Grade 60 (420) steel.
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Acknowledgments
The research described in this paper was supported by the California Department of Transportation under Contract No. 65A0600. Their support is gratefully acknowledged. Conclusions are those of the authors alone and should not be construed as to imply endorsement by Caltrans. The authors also wish to thank the technical staff and undergraduate workers of the Constructed Facilities Laboratory at NC State, without whom this work would not have been possible.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 2 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 14, 2018
Accepted: Apr 19, 2019
Published online: Dec 6, 2019
Published in print: Feb 1, 2020
Discussion open until: May 6, 2020
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