Modified adaptive negative stifiness device with variable negative stifiness and geometrically nonlinear damping for seismic protection of structures

Li, H; Li, J; Yu, Y; Li, Y

Modified adaptive negative stifiness device with variable negative stifiness and geometrically nonlinear damping for seismic protection of structures

Li, H Li, J

Yu, Y

Li, Y

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Publisher:: World Scientific Publishing
Publication Type:: Journal Article
Citation:: International Journal of Structural Stability and Dynamics, 2021, 21, (8)
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Li, H
dc.contributor.author	Li, J https://orcid.org/0000-0002-2526-3048
dc.contributor.author	Yu, Y https://orcid.org/0000-0001-9592-8191
dc.contributor.author	Li, Y https://orcid.org/0000-0002-6720-8493
dc.date.accessioned	2022-05-12T21:33:23Z
dc.date.available	2022-05-12T21:33:23Z
dc.date.issued	2021-01-01
dc.identifier.citation	International Journal of Structural Stability and Dynamics, 2021, 21, (8)
dc.identifier.issn	0219-4554
dc.identifier.issn	1793-6764
dc.identifier.uri	http://hdl.handle.net/10453/157309
dc.description.abstract	Adaptive negative sti®ness device is one of the promising seismic protection devices since it can generate seismic isolation e®ect through negative sti®ness when it is mostly needed and achieve similar vibration mitigation as a semi-active control device. However, the adaptive negative sti®ness device generally combined with linear viscous damping underpins the drawback of degrading the vibration isolation e®ect during the high-frequency region. In this paper, a modi¯ed adaptive negative sti®ness device (MANSD) with the ability to provide both lateral negative sti®ness and nonlinear damping by con¯guring linear springs and linear viscous dampers is proposed to address the above issue. The negative sti®ness and nonlinear damping are realised through a linkage mechanism. The fundamentals and dynamic characteristics of a SDOF system with such a device are analyzed and formulated using the Harmonic Balance Method, with a special focus on the amplitude–frequency response and transmissibility of the system. The system with damping nonlinearity as a function of displacement and velocity has been proven to have attractive advantages over linear damping in reducing the transmissibility in the resonance region without increasing that in the high-frequency region. The e®ect of nonlinear damping on suppressing displacement and acceleration responses is numerically veri¯ed under di®erent sinusoidal excitations and earthquakes with di®erent intensities. Compared with linear damping, the MANSD with nonlinear damping could achieve additional reductions on displacement and acceleration under scaled earthquakes, especially intensive earthquakes.
dc.language	English
dc.publisher	World Scientific Publishing
dc.relation	http://purl.org/au-research/grants/arc/DP150102636
dc.relation.ispartof	International Journal of Structural Stability and Dynamics
dc.relation.isbasedon	10.1142/S0219455421501078
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0913 Mechanical Engineering
dc.title	Modified adaptive negative stifiness device with variable negative stifiness and geometrically nonlinear damping for seismic protection of structures
dc.type	Journal Article
utslib.citation.volume	21
utslib.for	0905 Civil Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-05-12T21:33:19Z
pubs.issue	8
pubs.publication-status	Published
pubs.volume	21
utslib.citation.issue	8

Abstract:

Adaptive negative sti®ness device is one of the promising seismic protection devices since it can generate seismic isolation e®ect through negative sti®ness when it is mostly needed and achieve similar vibration mitigation as a semi-active control device. However, the adaptive negative sti®ness device generally combined with linear viscous damping underpins the drawback of degrading the vibration isolation e®ect during the high-frequency region. In this paper, a modi¯ed adaptive negative sti®ness device (MANSD) with the ability to provide both lateral negative sti®ness and nonlinear damping by con¯guring linear springs and linear viscous dampers is proposed to address the above issue. The negative sti®ness and nonlinear damping are realised through a linkage mechanism. The fundamentals and dynamic characteristics of a SDOF system with such a device are analyzed and formulated using the Harmonic Balance Method, with a special focus on the amplitude–frequency response and transmissibility of the system. The system with damping nonlinearity as a function of displacement and velocity has been proven to have attractive advantages over linear damping in reducing the transmissibility in the resonance region without increasing that in the high-frequency region. The e®ect of nonlinear damping on suppressing displacement and acceleration responses is numerically veri¯ed under di®erent sinusoidal excitations and earthquakes with di®erent intensities. Compared with linear damping, the MANSD with nonlinear damping could achieve additional reductions on displacement and acceleration under scaled earthquakes, especially intensive earthquakes.

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http://hdl.handle.net/10453/157309