Fatigue Tests on Fe-SMA Strengthened Steel Plates Considering Thermal Effects
Publication: Journal of Structural Engineering
Volume 149, Issue 3
Abstract
An iron-based shape memory alloy (Fe-SMA) can be used to conveniently apply prestress strengthening via a heating and cooling procedure. Material-level tests demonstrated that prestress of Fe-SMAs is sensitive to mechanical and thermal loading. Durability of steel structures strengthened by Fe-SMAs when subjected to harsh service conditions, such as coupled thermomechanical cycles is not fully understood. In this study, high-cycle fatigue tests were conducted on damaged steel plates retrofitted with Fe-SMA strips. Four temperature scenarios were adopted: room temperature (RT), a low temperature (LT) of , a high temperature (HT) of 60°C, and a cyclic temperature (CT) from to 60°C. Results showed that regardless of temperature variation, the Fe-SMA presented reliable repairing effects on steel plates, of which, the fatigue life was 2.1–3.5 times larger than that of the unstrengthened samples. The difference in coefficients of thermal expansion (CTEs) between the Fe-SMA and steel, as well as loss of prestress of the Fe-SMA due to fatigue and thermal loading, both affected the fatigue performance of the retrofitted specimens.
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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 study was supported by the National Natural Science Foundation of China (Project Nos. 52222803 and 51878485), the Shanghai Science and Technology Committee Rising-Star Program (19QC1400400), China. The authors thank re-fer AG, Switzerland, for providing the Fe-SMA materials.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 25, 2022
Accepted: Oct 13, 2022
Published online: Dec 23, 2022
Published in print: Mar 1, 2023
Discussion open until: May 23, 2023
ASCE Technical Topics:
- Construction engineering
- Construction methods
- Engineering fundamentals
- Fatigue (material)
- Fatigue tests
- Material mechanics
- Material properties
- Materials engineering
- Materials processing
- Measurement (by type)
- Plates
- Prestressing
- Rehabilitation
- Steel plates
- Strength of materials
- Stress (by type)
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
- Temperature effects
- Temperature measurement
- Thermal loads
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