Seismic Performance of Reinforced Concrete Beams Susceptible to Single-Crack Plastic Hinge Behavior
Publication: Journal of Structural Engineering
Volume 149, Issue 4
Abstract
Following the 2010/2011 Canterbury and 2016 Kaikoura earthquakes, a number of reinforced concrete (RC) beams in high-rise structures developed a single primary crack at the beam-column interface without the formation of distributed secondary cracks along the beam length. Detailed assessments showed that these beams have conforming longitudinal steel ratios and the single-crack mechanism may be due to design and/or construction practices for beam-column joints in the 1980s. In order to investigate the seismic behavior of reinforced concrete beams with detailing that inhibited the spread of flexural yielding, an experimental program was carried out on RC beam specimens, having similar reinforcement detailing to that of beams that developed a single crack at their ends during the Kaikoura earthquake to understand their seismic behavior, postearthquake repairability, and residual low-cycle fatigue life. Experimental results showed that the beams were able to undergo significant inelastic drift demands without loss of lateral resistance and have sufficient residual drift capacity following moderate and large earthquake demands. The response of the beam specimens was dominated by hinge rotation via the bond-slip mechanism. Comparisons showed that the measured drift capacities of the beams exceeded the predicted drift capacities computed using state-of-the-practice procedures.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (all figures and tables).
Acknowledgments
The first author would like to acknowledge the Ph.D. scholarship support from QuakeCoRE—a New Zealand Tertiary Education Commission-funded Centre. This experimental program was also supported by QuakeCoRE. The authors would like to acknowledge the advice and assistance provided by Anthony Synge, Tyler Best, Lucas Hogan, Arpit Joshi, Patrick Rogers, Mark Byrami, Nimra Umair Margarita Onishchenko, and Matthew Jenkins during the construction and testing phases of this project.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 18, 2022
Accepted: Nov 21, 2022
Published online: Feb 8, 2023
Published in print: Apr 1, 2023
Discussion open until: Jul 8, 2023
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