Feed-forward control of active variable stiffness systems for mitigating seismic hazard in structures

Pnevmatikos, NG; Kallivokas, LF; Gantes, CJ

dc.contributor.author	Pnevmatikos, NG	en
dc.contributor.author	Kallivokas, LF	en
dc.contributor.author	Gantes, CJ	en
dc.date.accessioned	2014-03-01T01:20:31Z
dc.date.available	2014-03-01T01:20:31Z
dc.date.issued	2004	en
dc.identifier.issn	0141-0296	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15940
dc.subject	Active seismic control	en
dc.subject	Bracing systems	en
dc.subject	Early-warning systems	en
dc.subject	Resonance control	en
dc.subject	Variable stiffness system	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Natural frequencies	en
dc.subject.other	Seismology	en
dc.subject.other	Spectrum analysis	en
dc.subject.other	Stiffness	en
dc.subject.other	Active variable stiffness (AVS)	en
dc.subject.other	Near-resonance phenomena	en
dc.subject.other	Structural analysis	en
dc.subject.other	active control	en
dc.subject.other	earthquake engineering	en
dc.subject.other	seismic response	en
dc.subject.other	structural response	en
dc.title	Feed-forward control of active variable stiffness systems for mitigating seismic hazard in structures	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.engstruct.2003.11.003	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.engstruct.2003.11.003	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	In this paper we discuss a practical two-stage approach (design and operation) to the seismic control of structures equipped with active variable stiffness (AVS) systems, as a means to mitigate or eliminate resonance or near-resonance phenomena in structures due to seismic ground motion. During the design stage, past seismic events are processed to extract the characteristic frequency content against which the AVS-equipped structure is designed, using a conventional envelope spectrum approach. The motivation for the operation stage builds upon advances in early-warning systems that hold the promise of delivering the expected ground motion waveforms at sites equipped with AVS and at instances just prior to the first wave arrival. The working hypothesis for the operation stage is that notification of the incoming motion will be served to the AVS-equipped site so as to allow for a small but sufficient window for moving the hydraulics of the AVS system to compensate for the frequency content of the arriving seismic signal. Numerical results are presented for both design and operation stages of a prototype building under real past seismic events. (C) 2004 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Engineering Structures	en
dc.identifier.doi	10.1016/j.engstruct.2003.11.003	en
dc.identifier.isi	ISI:000220048000005	en
dc.identifier.volume	26	en
dc.identifier.issue	4	en
dc.identifier.spage	471	en
dc.identifier.epage	483	en