Cyclic Behavior of Steel Tube-Confined Circular RC Columns under High Axial Load
Publication: Journal of Structural Engineering
Volume 150, Issue 10
Abstract
This study builds on existing researches to further investigates cyclic responses of the steel tube-confined reinforced concrete (RC) columns, with a primary focus on those subjected to high-axial load. A total of eleven column specimens were tested under lateral displacement reversal and axial load of either or , where and refers to concrete cross section area and tested concrete strength of the column, respectively. Three specimens represented the conventional reinforced concrete (RC) columns while the rest were the steel tube-confined circular RC columns. The key test parameters included (1) amount of longitudinal reinforcement, (2) axial load level, (3) continuity of the confining steel tube, and (4) clear cover of the longitudinal reinforcement. Test results showed that all the steel tube-confined RC specimens sustained the target axial load and maximum lateral strength up to around 10% drift ratio. A simple strength model was proposed to reasonably estimate the maximum strength of the steel tube-confined RC columns. The flexural rigidity ratio, , for RC specimens and specimens confined by continuous steel tube ranged between 0.6 and 0.8, approximately. Specimens confined by the cutoff steel tube showed lower ratio between approximately 0.3 and 0.6.
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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.
Acknowledgments
This research was sponsored by the Taiwan Building Technology Center (TBTC) under the Featured Area Research Center Program within the framework of the Higher Education Sprout Project of the Ministry of Education of Taiwan. The ideas and conclusions expressed in this manuscript are those of the authors and may not represent the views of the sponsor.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jan 5, 2024
Accepted: Apr 18, 2024
Published online: Jul 31, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 31, 2024
ASCE Technical Topics:
- Axial loads
- Columns
- Concrete
- Concrete columns
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Load tests
- Material mechanics
- Material properties
- Materials engineering
- Reinforced concrete
- Static loads
- Statics (mechanics)
- Steel columns
- Strength of materials
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
- Tubes (structure)
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