Development of a Novel Anchorage System for Shape Memory Alloy Bars in Self-Centering Structures
Publication: Journal of Structural Engineering
Volume 150, Issue 5
Abstract
Shape memory alloys (SMAs) show great potential in self-centering structures because of their appealing superelastic feature and good energy dissipation capability. The mechanical properties of SMA bars have been extensively studied over the past decades. However, the characteristics of smooth surface and poor machinability of the SMA bars, especially the widely used nickel–titanium SMAs, bring challenges to the anchorage systems in practical applications. This existing limitation is especially prominent for SMA bars designed to be used at the critical deformation locations of structural members or in seismic devices experiencing extreme working conditions. For this reason, this paper develops a novel hybrid threaded-swaged anchorage system to overcome the limitations of the current SMA mechanical splices. The uniaxial behavior of the threaded-swaged anchorage systems under different loading conditions was investigated experimentally with emphasis on the seismic application-oriented responses. Furthermore, the influence of eccentricity on the anchorage system was also considered to evaluate the SMA bars with large end rotation induced by the rocking behavior of the self-centering structures during earthquake shaking. Test results reveal that the performance of the proposed anchorage system is satisfactory with stable behavior under different loading conditions, which can provide a promising anchorage solution for SMA bars used in seismic resilient design. Moreover, a practical design method for this anchorage system is proposed for implementation in seismic 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
The authors are grateful for the financial support from the Sichuan Science and Technology Program, China (Grant No. 2023NSFSC0379), the Grant-in-Aid for Scientific Research (JSPS KAKENHI Grant No. JP 19F19077), and the Research Grants Council of Hong Kong (Grant No. PolyU 152246/18E). The findings and opinions expressed in this paper are solely those of the authors and do not represent the views of the sponsor.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 5 • May 2024
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© 2024 American Society of Civil Engineers.
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Received: Feb 13, 2023
Accepted: Dec 21, 2023
Published online: Feb 28, 2024
Published in print: May 1, 2024
Discussion open until: Jul 28, 2024
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