Effects of Stirrup Corrosion on the Shear Performance of Reinforced Concrete Beams after Fire Exposure
Publication: Journal of Structural Engineering
Volume 150, Issue 8
Abstract
Previous studies have demonstrated that elevated temperatures exert a significant influence on the structural performance of reinforced concrete (RC) members. However, the residual shear performance of the RC beam under the combined effects of stirrup corrosion and fire has not been thoroughly explored. Therefore, this paper aims to investigate this aspect by prefabricating eight RC beams and employing experimental, numerical, and theoretical methods. The influence of varying stirrup corrosion degrees and fire exposure time on the residual shear capacity of these beams was examined. It was observed that corrosion-induced cracks had an impact on the distribution of the temperature field within the RC beams. Furthermore, the exposure to the corrosion–fire combination significantly affected the shear capacity of the RC beams. Notably, stirrup corrosion may lead to a more brittle failure after a fire. To assess the impact of corrosion degree and fire exposure time on the temperature field and residual shear properties of RC beams, a simplified finite element (FE) model considering the effect of concrete spalling was developed. The accuracy of this model was validated through a comparison with experimental results. Finally, three theoretical methods for predicting the residual shear capacity of postfire RC beams with corroded stirrups were proposed, based on Chinese, American, and European codes. A comparison between the calculated and test results revealed a good agreement. These methods can provide conservative predictions for practical engineering applications.
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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 work was conducted with financial support from the National Natural Science Foundation of China (Grant No. 52178487) and the Natural Science Foundation of Shandong Province (Grant No. ZR2021ME228).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 5, 2023
Accepted: Mar 18, 2024
Published online: Jun 8, 2024
Published in print: Aug 1, 2024
Discussion open until: Nov 8, 2024
ASCE Technical Topics:
- Analysis (by type)
- Beams
- Concrete
- Concrete beams
- Corrosion
- Deterioration
- Disaster risk management
- Disasters and hazards
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fires
- Man-made disasters
- Materials characterization
- Materials engineering
- Methodology (by type)
- Numerical analysis
- Numerical methods
- Reinforced concrete
- Structural engineering
- Structural members
- Structural systems
- Temperature (by type)
- Temperature distribution
- Thermal properties
- Thermodynamics
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