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Smart Structures and Systems
  Volume 26, Number 1, July 2020, pages 89-102

Shape memory alloy (SMA)-based Superelasticity-assisted Slider (SSS): an engineering solution for practical aseismic isolation with advanced materials
Peyman Narjabadifam, Mohammad Noori, Donatello Cardone, Rasa Eradat and Mehrdad Kiani

    Shape memory alloy (SMA)-based Superelasticity-assisted Slider (SSS) is proposed as an engineering solution to practically exploit the well-accepted advantages of both sliding isolation and SMA-based recentering. Self-centering capability in SSS is provided by austenitic SMA cables (or wire ropes), recently attracting a lot of interest and attention in earthquake engineering and seismic isolation. The cables are arranged in various novel and conventional configurations to make SSS versatile for aseismic design and retrofit of structures. All the configurations are detailed with thorough technical drawings. It is shown that SSS is applicable without the need for Isolation Units (IUs). IUs, at the same time, are devised for industrialized applications. The proof-ofconcept study is carried out through the examination of mechanical behavior in all the alternative configurations. Forcedisplacement relations are determined. Isolation capabilities are predicted based on the decreases in seismic demands, estimated by the increases in effective periods and equivalent damping ratios. Restoring forces normalized relative to resisting forces are assessed as the criteria for self-centering capabilities. Lengths of SMA cables required in each configuration are calculated to assess the cost and practicality. Practical implementation is realized by setting up a small-scale IU. The effectiveness of SSS under seismic actions is evaluated using an innovative computer model and compared to those of well-known Isolation Systems (ISs) protecting a reference building. Comparisons show that SSS seems to be an effective IS and suitable for earthquake protection of both structural and non-structural elements. Further research aimed at additional validation of the system are outlined.
Key Words
    shape memory alloy; superelasticity; sliding bearing; earthquake protection; aseismic base isolation
(1) Peyman Narjabadifam:
Department of Civil Engineering, Faculty of Engineering, University of Bonab, 5551761167 Bonab, East Azerbaijan, Iran;
(2) Mohammad Noori:
Department of Mechanical Engineering, California Polytechnic State University, 93405 San Luis Obispo CA, USA;
(3) Donatello Cardone:
School of Engineering, University of Basilicata, 85100 Potenza, Basilicata, Italy;
(4) Rasa Eradat:
Department of Structural Earthquake Engineering, Sharestan Tarh Tabriz Consultants, 5166846849 Tabriz, East Azerbaijan, Iran;
(5) Mehrdad Kiani:
Department of Industrial Architecture, Sharestan Tarh Tabriz Consultants, 5166846849 Tabriz, East Azerbaijan, Iran.

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