Plastic Buckling-Straightening Fatigue Life of Large Diameter Reinforcing Steel Bars
Publication: Journal of Structural Engineering
Volume 150, Issue 1
Abstract
Large infrastructure projects can efficiently use large diameter bars as longitudinal reinforcement in reinforced concrete elements. In earthquake-prone zones, critical regions of these elements must be detailed for ductility and hysteretic energy dissipation. Longitudinal bars in these regions are expected to sustain large-amplitude strain cyclic reversals before bar fracture occurs, in a mode of failure defining the collapse prevention limit state. To date, no successful large strain-amplitude cyclic loading testing has been reported on large-diameter reinforcing bars to observe the large-strain amplitude fatigue life of such bars, which often involves plastic bar buckling. This paper describes a test program designed to determine the plastic buckling/straightening fatigue life of ASTM A706 Grade 60 No. 18 bars () reinforcing bars subjected to cycles of reversed plastic strains. The design and implementation of the loading apparatus, critical for the gripping of the bars, the metallurgical characterization of the bars, and several key test results are discussed in the paper. Finally, the paper discusses a general unidimensional fatigue damage index precursor to bar fracture following a few plastic buckling and straightening cycles.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
Funding for the research program was provided by the California Department of Transportation (Caltrans) under contract No. 65A0502. The authors thank Dr. Charly Sikorsky and Mr. Issam Nouredinne, the Caltrans project managers associated with this project. The authors also thank the U.C. San Diego Charles Lee Powell Structural Engineering Laboratory staff, Drs. Christopher Latham, Rodrigo Carreño, and Koorosh Lotfizadeh for their technical assistance in preparing and conducting the tests. Nucor Corp. and Gerdau Long Steel North America donated the reinforcing bars to the test program. Their generous contribution is acknowledged.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 1 • January 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 25, 2022
Accepted: Jul 10, 2023
Published online: Oct 24, 2023
Published in print: Jan 1, 2024
Discussion open until: Mar 24, 2024
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