Smart restorable sliding base isolation system |
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| Authors: | Abdolrahim Jalali Donatello Cardone Peyman Narjabadifam |
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| Institution: | (1) Section on Prevention and Mitigation of Natural Risks, ENEA, Via Martiri di Monte Sole, 4, 40129 Bologna, Italy;(2) Isolation and Other Anti-Seismic Design Strategies, GLIS, c/o ENEA, Via Martiri di Monte Sole, 4, 40129 Bologna, Italy;(3) Territorial Section for the EU and the Other Western European Countries, Anti-Seismic Systems International Society, ASSISi, c/o ENEA, Via Martiri di Monte Sole, 4, 40129 Bologna, Italy;(4) Faculty of Architecture, University of Ferrara, Via Quartieri 8, 44121 Ferrara, Italy |
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| Abstract: | A modern base isolation system is proposed for the aseismic control of structures. It is composed of steel-Teflon Flat Sliding
Bearings, to support the gravity loads while allowing large horizontal displacements, and simply connected Shape Memory Alloy
(SMA) truss elements, to provide the necessary horizontal stiffness as well as a proper restoring capability. The system is
referred to as Smart Restorable Sliding Base Isolation System (SRSBIS). Depending on the arrangement of the auxiliary SMA
elements, SRSBIS can exhibit a geometric nonlinearity in addition to the nonlinearity of materials. In this paper, the dynamic
characteristics of SRSBIS are first examined in terms of the force-displacement behavior, effective period of vibration, and
equivalent damping. After that, the earthquake response of buildings equipped with SRSBIS, designed in accordance with a direct
displacement-based approach, is evaluated through extensive nonlinear time-history analyses. The effects of the design parameters
on the system behavior are then investigated within a comprehensive parametric study and the seismic performances of SRSBIS
are finally compared to those of similar practical isolation systems. Based on the results, it is shown that SRSBIS can be
suitably used for the seismic protection of structures. |
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