Equivalent uniform damping ratios for linear irregularly damped concrete/steel mixed structures

Papageorgiou, AV; Gantes, CJ

dc.contributor.author	Papageorgiou, AV	en
dc.contributor.author	Gantes, CJ	en
dc.date.accessioned	2014-03-01T01:35:38Z
dc.date.available	2014-03-01T01:35:38Z
dc.date.issued	2011	en
dc.identifier.issn	0267-7261	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21139
dc.subject	Dynamic Response	en
dc.subject	Oscillations	en
dc.subject	Seismic Analysis	en
dc.subject	Seismic Design	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Commercial software	en
dc.subject.other	Complex modes	en
dc.subject.other	Damping ratio	en
dc.subject.other	Equivalent damping	en
dc.subject.other	Irregular structures	en
dc.subject.other	Mixed structure	en
dc.subject.other	Mode characteristics	en
dc.subject.other	Seismic analysis	en
dc.subject.other	Seismic code	en
dc.subject.other	Semi-empirical	en
dc.subject.other	Damping	en
dc.subject.other	Dynamic response	en
dc.subject.other	Seismology	en
dc.subject.other	Vibration analysis	en
dc.subject.other	Seismic design	en
dc.subject.other	concrete structure	en
dc.subject.other	damping	en
dc.subject.other	dynamic response	en
dc.subject.other	earthquake engineering	en
dc.subject.other	error analysis	en
dc.subject.other	seismic design	en
dc.subject.other	software	en
dc.title	Equivalent uniform damping ratios for linear irregularly damped concrete/steel mixed structures	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.soildyn.2010.09.010	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.soildyn.2010.09.010	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Structures consisting of two parts, a lower part made of concrete and an upper part made of steel are investigated. In code-based seismic design of such structures several practical difficulties are encountered, due to inherent differences in the nature of dynamic response of each part. The specific issue addressed here is the analysis complications due to the different damping ratios of the two parts. Such structures are irregularly damped and have complex modes of vibration, so that their analysis cannot be handled with readily available commercial software. This work aims at providing a simple yet sufficiently accurate methodology for handling the damping irregularity of such structures, by proposing an overall equivalent damping ratio that can be applied to the complete structure for obtaining its dynamic response. This is achieved by first transforming MDOF irregular structures into equivalent 2-DOF oscillators, using the first mode characteristics of each part, and then using equivalent uniform damping ratios that are derived by means of a semi-empirical error minimization procedure. Thus, available commercial software can be applied for seismic analysis and design and the provisions of existing seismic codes can be adhered to. (C) 2010 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Soil Dynamics and Earthquake Engineering	en
dc.identifier.doi	10.1016/j.soildyn.2010.09.010	en
dc.identifier.isi	ISI:000286866000013	en
dc.identifier.volume	31	en
dc.identifier.issue	3	en
dc.identifier.spage	418	en
dc.identifier.epage	430	en