Development of a Novel Controllable Seismic Isolation System Based on Negative Stiffness Concept

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This research aims to address the challenges underwent by traditional adaptive seismic negative stiffness devices (ASNSDs) and other base isolators to contribute new knowledge to the seismic protection field. Firstly, the beneficial effects of nonlinear damping and stiffness on seismic protection are investigated in the form of proposing a modified ASNSD with open-loop control. It has attractive advantages in reducing the transmissibility during the resonance region without increasing that in the high-frequency region. The controllable damping is then innovatively introduced to the ASNSD to improve its adaptability and robustness to various earthquakes. The developed ASNSD with feedback control integrates both negative stiffness and controllable damping characteristics to realize real-time controllable property. The ASNSD is then applied to multiple storeys of a building to develop an adaptive seismic negative stiffness system (ASNSS) to achieve vibration isolation along the building height. Following that, a comprehensive multi-objective optimization is conducted to obtain optimal structural parameters of the ASNSD to improve the seismic protection performance of the ASNSS. Finally, the quasi-zero stiffness vibration isolator is utilised as a potential resolution for mitigating the impact of the vertical seismic load associating with the excessive lateral displacement on the stability of ASNSD members' interlayer slips.
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