Seismic base isolation by nonlinear mode localization

Wang, Y; McFarland, DM; Vakakis, AF; Bergman, LA

dc.contributor.author	Wang, Y	en
dc.contributor.author	McFarland, DM	en
dc.contributor.author	Vakakis, AF	en
dc.contributor.author	Bergman, LA	en
dc.date.accessioned	2014-03-01T01:23:03Z
dc.date.available	2014-03-01T01:23:03Z
dc.date.issued	2005	en
dc.identifier.issn	0939-1533	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16788
dc.subject	Base isolation	en
dc.subject	Nonlinear localization	en
dc.subject	Nonlinear normal modes	en
dc.subject.classification	Mechanics	en
dc.subject.other	Attenuation	en
dc.subject.other	Computer simulation	en
dc.subject.other	Control nonlinearities	en
dc.subject.other	Damping	en
dc.subject.other	Linear systems	en
dc.subject.other	Resonance	en
dc.subject.other	Stiffness	en
dc.subject.other	Vibrations (mechanical)	en
dc.subject.other	Base isolation	en
dc.subject.other	Nonlinear localization	en
dc.subject.other	Nonlinear normal modes	en
dc.subject.other	Vibration dampers	en
dc.subject.other	Nonlinear systems	en
dc.title	Seismic base isolation by nonlinear mode localization	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s00419-004-0361-6	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s00419-004-0361-6	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	In this paper the performance of a nonlinear base-isolation system comprised of a nonlinearly sprung subfoundation tuned in a 1:1 internal resonance to a flexible mode of the linear primary structure to be isolated is examined. The application of nonlinear localization to seismic isolation distinguishes this study from other base-isolation studies in the literature. Under the condition of third-order smooth stiffness nonlinearity it is shown that a localized nonlinear normal mode (NNM) is induced in the system which confines energy to the subfoundation and away from the primary or main structure. This is followed by a numerical analysis wherein the smooth nonlinearity is replaced by clearance nonlinearity and the system is excited by ground motions representing near-field seismic events. The performance of the nonlinear system is compared with that of the corresponding linear system through simulation and the sensitivity of the isolation system to several design parameters is analyzed. These simulations confirm the existence of the localized NNM and show that the introduction of simple clearance nonlinearity significantly reduces the seismic energy transmitted to the main structure resulting in significant attenuation in the response. © Springer-Verlag Berlin Heidelberg 2005.	en
heal.publisher	SPRINGER	en
heal.journalName	Archive of Applied Mechanics	en
dc.identifier.doi	10.1007/s00419-004-0361-6	en
dc.identifier.isi	ISI:000227555100007	en
dc.identifier.volume	74	en
dc.identifier.issue	5-6	en
dc.identifier.spage	387	en
dc.identifier.epage	414	en