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Test and development of SMA-based negative stiffness isolation device

Test and development of SMA-based negative stiffness isolation device Although shape memory alloy (SMA) wires/cables can improve the re-centering capacity of traditional isolation devices to prevent residual displacement, pounding, or falling of girders, they also raise the forces in the substructure since the stiffness of the device is increased. In this paper, quasi-static lateral shear tests of an SMA-based negative stiffness isolation device were conducted at first to reduce the increased forces of the substructure. The mechanical properties and the failure modes of the SMA-based negative stiffness isolation device are studied. Next, the SMA-based negative stiffness isolation device is updated based on its failure modes. Finally, the mechanical properties of the improved device were numerically studied. The results show that the new SMA-based negative stiffness isolation device can partially reduce the force responses of the substructure in addition to keeping excellent re-centering capability. Moreover, it can also limit the excessive displacement of bridges to prevent the girders from falling. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Structural Engineering SAGE

Test and development of SMA-based negative stiffness isolation device

Shao, Chenxi; Cao, Sasa
Advances in Structural Engineering , Volume 25 (12): 13 – Sep 1, 2022
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Publisher
SAGE
Copyright
© The Author(s) 2022
ISSN
1369-4332
eISSN
2048-4011
DOI
10.1177/13694332221097733
Publisher site
See Article on Publisher Site

Abstract

Although shape memory alloy (SMA) wires/cables can improve the re-centering capacity of traditional isolation devices to prevent residual displacement, pounding, or falling of girders, they also raise the forces in the substructure since the stiffness of the device is increased. In this paper, quasi-static lateral shear tests of an SMA-based negative stiffness isolation device were conducted at first to reduce the increased forces of the substructure. The mechanical properties and the failure modes of the SMA-based negative stiffness isolation device are studied. Next, the SMA-based negative stiffness isolation device is updated based on its failure modes. Finally, the mechanical properties of the improved device were numerically studied. The results show that the new SMA-based negative stiffness isolation device can partially reduce the force responses of the substructure in addition to keeping excellent re-centering capability. Moreover, it can also limit the excessive displacement of bridges to prevent the girders from falling.

Journal

Advances in Structural Engineering – SAGE

Published: Sep 1, 2022

Keywords: Negative stiffness isolation device; tests; bridges; SMA cable; failure modes

References

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