Theoretical Axial and Lateral Stress–Strain Model for Steel Tube–Reinforced Concrete Column
Publication: Journal of Structural Engineering
Volume 150, Issue 10
Abstract
Steel tube–reinforced concrete (STRC) columns are composite members consisting of an inner concrete-filled steel tube (ICFST) component and an outer reinforced concrete (ORC) component. These columns are commonly used in the bottom columns of high-rise buildings and bridge piers to withstand significant axial loads. However, the stress state of the components in a STRC composite column differs from that of a single confinement component. As a result, the existing lateral strain model and concrete constitutive model cannot be directly applied to describe the stress–strain development of each component. To address this issue, this study combines the existing confined concrete models with the stress balance condition and strain development characteristics of the cross section of a STRC composite column. Theoretical models are proposed to simulate the development of lateral strain and confining stress in both the ICFST component and ORC component. Additionally, the biaxial stress state of the steel tube is considered based on the generalized Hooke law and Prandtl-Reuss theory in the theoretical model. Consequently, an incremental iterative calculation model for the whole axial load–strain curve is proposed. The effectiveness of the proposed models is verified by comparing the calculation results with the experimental results.
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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
Support from the National Natural Science Foundation of China with Grant No. 51890901, Natural Science Foundation of Hunan Province with Grant Nos. 2020JJ2003 and 2020RC5005, and Project for Enhancing Young and Middle-aged Teacher’s Research Basis Ability in Colleges of Guangxi with Grant No. 2024KY1168 are gratefully acknowledged.
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Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Nov 8, 2023
Accepted: Feb 29, 2024
Published online: Aug 9, 2024
Published in print: Oct 1, 2024
Discussion open until: Jan 9, 2025
ASCE Technical Topics:
- Axial loads
- Columns
- Composite columns
- Concrete
- Concrete columns
- Engineering materials (by type)
- Engineering mechanics
- Material mechanics
- Materials engineering
- Reinforced concrete
- Static loads
- Statics (mechanics)
- Steel columns
- Strain
- Stress (by type)
- Stress strain relations
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
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