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

Li, Huan

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

Li, Huan

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Publication Type:: Thesis
Issue Date:: 2021

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Field	Value	Language
dc.contributor.author	Li, Huan
dc.date.accessioned	2021-10-01T06:50:33Z
dc.date.available	2021-10-01T06:50:33Z
dc.date.issued	2021
dc.identifier.uri	http://hdl.handle.net/10453/150782
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	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.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/150782/2/02whole.pdf
dc.rights	au.edu.uts.lib/ppc
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.title	Development of a Novel Controllable Seismic Isolation System Based on Negative Stiffness Concept	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2023-05-13T00:00:00+1000

Abstract:

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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http://hdl.handle.net/10453/150782