Experimental Study of Novel Self-Centering Seismic Base Isolators Incorporating Superelastic Shape Memory Alloys
Publication: Journal of Structural Engineering
Volume 146, Issue 7
Abstract
This paper proposes novel self-centering (SC) seismic base isolators by utilizing shape memory alloy U-shaped dampers (SMA-UDs) with favorable superelastic behavior. Two different designs, which incorporate the SMA-UDs into a conventional laminated rubber bearing with a lead core or that with steel-UDs, are investigated. In both designs, four groups of superelastic SMA-UDs are arranged symmetrically around the rubber bearings. In the SC seismic base isolators, the laminated rubber bearings withstand the high vertical loads from superstructures, and the lead cores or the steel-UDs provide the majority of energy dissipation through hysteresis behavior under cyclic loading. Moreover, the superelastic SMA-UDs spontaneously offer excellent SC force, which can effectively minimize residual deformations and reduce downtime after earthquakes. This study first illustrates the working mechanism and performance of the SMA-UDs in the base isolators through a series of component tests under loadings with different directions (i.e., in-plane and out-of-plane directions), protocols, and frequencies. Subsequently, the principles and performances of the SC base isolators are examined systematically through the quasistatic cyclic loading tests of the conventional and proposed base isolators. Test results demonstrate that these SC base isolators can exhibit satisfactory SC capability and stable energy dissipation. Moreover, the hysteresis characteristics of the SC base isolators are nearly isotropic, thereby enabling the SC base isolators to resist seismic actions in any horizontal direction. In comparison with conventional seismic base isolators, the proposed SC base isolators will provide a promising type of high-performance seismic-resilient devices required by modern civil infrastructure.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors are grateful for the financial support from the Research Grants Council of Hong Kong through the GRF Project (No. PolyU 152246/18E) and NSFC/RGC Joint Research Scheme (N_PolyU533/17, 51761165022). The first author also acknowledges the partial support from the Grant-in-Aid for Scientific Research (JSPS KAKENHI No. JP19F19077). The findings and opinions expressed in this paper are solely those of the authors and do not represent the view of the sponsors.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 7 • July 2020
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©2020 American Society of Civil Engineers.
History
Received: Jul 11, 2019
Accepted: Jan 28, 2020
Published online: Apr 29, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 29, 2020
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