Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames

Nonlinear time history analysis is recognized as the most appropriate tool for assessing the real behaviour of structures during seismic excitations. Validity rate of obtained results from this analysis significantly depends to the modeling, details and defined parameters. One of the main aspects of...

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Autores principales:	Saman Rahat Dahmardeh, Mehrtash Motamedi, Armin Aziminejad
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	natural damping rayleigh method moment-resisting steel frame earthquake nonlinear time history analysis Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/6751215a58b04e0ab418cc258e4d90f5
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spelling	oai:doaj.org-article:6751215a58b04e0ab418cc258e4d90f52021-11-08T15:53:27ZInvestigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames2476-39772538-261610.22065/jsce.2018.121440.1490https://doaj.org/article/6751215a58b04e0ab418cc258e4d90f52021-01-01T00:00:00Zhttps://www.jsce.ir/article_77131_dd9ac73e7bded7df418509be91c981dc.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Nonlinear time history analysis is recognized as the most appropriate tool for assessing the real behaviour of structures during seismic excitations. Validity rate of obtained results from this analysis significantly depends to the modeling, details and defined parameters. One of the main aspects of dynamic modeling is the consideration of natural viscous damping as well as value of damping ratio (ξ), which during last years evaluating the effects of these factors on nonlinear responses of moment-resisting steel frames has been limited, and Rayleigh damping model with ξ of 5% was used by researchers. Therefore, in this study attempt has been made to examine the impacts of value and modeling approach of natural damping on nonlinear responses of moment-resisting steel frames. For this purpose, a full scale 4 story steel structure which tested on shake table in 2007 has been considered as reference and modeled by OpenSees software. Natural damping has been defined with three methods; Rayleigh damping, mass-proportional damping and stiffness-proportional damping, for five different values of damping ratio (ξ=0.01, 0.02, 0.03, 0.04, 0.05). After conducting the nonlinear time history analyses, difference of obtained structural responses compared to the experimental responses has been investigated, and then errors of them have been extracted. Results indicate that reduce of damping ratio leads to the notable decrease of responses, specially, for story shear and overturning moment. The use of 5% damping ratio for nonlinear dynamic analysis of low rise moment-resisting frames is not appropriate and in most of cases leads to the underestimate and unreal results. Besides, it should be noted that the mass-proportional and Rayleigh damping models have higher accuracy in comparison with stiffness-proportional damping model, and these models show lower error.Saman Rahat DahmardehMehrtash MotamediArmin AziminejadIranian Society of Structrual Engineering (ISSE)articlenatural dampingrayleigh methodmoment-resisting steel frameearthquakenonlinear time history analysisBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 7, Iss 4, Pp 93-113 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	natural damping rayleigh method moment-resisting steel frame earthquake nonlinear time history analysis Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	natural damping rayleigh method moment-resisting steel frame earthquake nonlinear time history analysis Bridge engineering TG1-470 Building construction TH1-9745 Saman Rahat Dahmardeh Mehrtash Motamedi Armin Aziminejad Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
description	Nonlinear time history analysis is recognized as the most appropriate tool for assessing the real behaviour of structures during seismic excitations. Validity rate of obtained results from this analysis significantly depends to the modeling, details and defined parameters. One of the main aspects of dynamic modeling is the consideration of natural viscous damping as well as value of damping ratio (ξ), which during last years evaluating the effects of these factors on nonlinear responses of moment-resisting steel frames has been limited, and Rayleigh damping model with ξ of 5% was used by researchers. Therefore, in this study attempt has been made to examine the impacts of value and modeling approach of natural damping on nonlinear responses of moment-resisting steel frames. For this purpose, a full scale 4 story steel structure which tested on shake table in 2007 has been considered as reference and modeled by OpenSees software. Natural damping has been defined with three methods; Rayleigh damping, mass-proportional damping and stiffness-proportional damping, for five different values of damping ratio (ξ=0.01, 0.02, 0.03, 0.04, 0.05). After conducting the nonlinear time history analyses, difference of obtained structural responses compared to the experimental responses has been investigated, and then errors of them have been extracted. Results indicate that reduce of damping ratio leads to the notable decrease of responses, specially, for story shear and overturning moment. The use of 5% damping ratio for nonlinear dynamic analysis of low rise moment-resisting frames is not appropriate and in most of cases leads to the underestimate and unreal results. Besides, it should be noted that the mass-proportional and Rayleigh damping models have higher accuracy in comparison with stiffness-proportional damping model, and these models show lower error.
format	article
author	Saman Rahat Dahmardeh Mehrtash Motamedi Armin Aziminejad
author_facet	Saman Rahat Dahmardeh Mehrtash Motamedi Armin Aziminejad
author_sort	Saman Rahat Dahmardeh
title	Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
title_short	Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
title_full	Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
title_fullStr	Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
title_full_unstemmed	Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
title_sort	investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/6751215a58b04e0ab418cc258e4d90f5
work_keys_str_mv	AT samanrahatdahmardeh investigationoftheeffectsofvalueandmodelingapproachofnaturaldampingonnonlinearresponsesoflowrisemomentresistingsteelframes AT mehrtashmotamedi investigationoftheeffectsofvalueandmodelingapproachofnaturaldampingonnonlinearresponsesoflowrisemomentresistingsteelframes AT arminaziminejad investigationoftheeffectsofvalueandmodelingapproachofnaturaldampingonnonlinearresponsesoflowrisemomentresistingsteelframes
_version_	1718441570040020992

Investigation of the effects of value and modeling approach of natural damping on nonlinear responses of low rise moment-resisting steel frames

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