Hysteretic Behavior of Self-Centering Shear Wall Incorporating Superelastic Shape Memory Alloy Bars and Engineered Cementitious Composites Subjected to Cyclic Loading
Publication: Journal of Structural Engineering
Volume 150, Issue 9
Abstract
Conventional reinforced concrete shear walls are vulnerable to strong earthquakes with significant residual deformations, which substantially affect structural service and can even lead to structural collapse. Superelastic shape memory alloys (SMAs) are advanced materials that can realize strain recovery upon unloading. If SMAs can be used as reinforcing bars in structures, they can undergo large deformation without permanent deformation. This study presents a complementary and synergistic material system that integrates SMA with damage-tolerant engineered cementitious composites (ECCs) to minimize residual displacement and mitigate concrete damage. This study explored the seismic performance of shear walls using SMA and ECC in the plastic hinge region. Reverse cyclic loading tests were performed on four specimens to demonstrate the feasibility of this method. The specimens included a conventional steel-reinforced concrete shear wall (SW-R-C), steel-reinforced ECC shear wall (SW-R-ECC), SMA-reinforced concrete shear wall (SW-SMA-C), and SMA-reinforced ECC shear wall (SW-SMA-ECC). The results show that the SW-SMA-C specimen exhibited remarkable self-centering capability of more than 85% even after a large deformation, compared to SW-R-C. Furthermore, reduced damage and better ductility were observed in the SW-SMA-ECC specimen in addition to reduced residual displacement. The proposed approach indicated that SMA combined with ECC is more effective in mitigating plastic hinge damage and minimizing residual displacements, which could improve the seismic performance of shear walls.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research project reported in this paper was supported by the National Natural Science Foundation of China (No. 51978631), Scientific and Technological Innovation Leaders in Central Plains of Henan Province (No. 234200510022), and the Support Program for Innovative Research Team (in Science and Technology) in University of Henan Province (No. 23IRTSTHN006). The authors hereby would like to express their thanks for these supports.
Author contributions: Hui Qian: Conceptualization, Methodology, Resources, Investigation, Writing–original draft, Writing–review and editing, Supervision, Funding acquisition; Liping Kang: Investigation, Data curation, Writing–review and editing, Writing–original draft; Zongao Li: Investigation, Data curation, Formal analysis, Writing–review and editing; Yifei Shi: Conceptualization, Investigation, Writing–review and editing; Xiangyu Wang: Data curation, Formal analysis, Writing–review and editing; Hongnan Li: Conceptualization, Methodology, Writing–review and editing
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Published In
Journal of Structural Engineering
Volume 150 • Issue 9 • September 2024
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© 2024 American Society of Civil Engineers.
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Received: Mar 9, 2023
Accepted: Feb 7, 2024
Published online: Jul 8, 2024
Published in print: Sep 1, 2024
Discussion open until: Dec 8, 2024
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