Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables

Using viscoelastic (VE) dampers is one of the most effective tools for seismic retrofitting of steel structures. The results of many experimental studies demonstrated that using fractional derivative terms for modelling viscoelastic dampers offers an acceptable level of accuracy. Unlike viscous damp...

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Autores principales:	Maryam Beheshti, Payam Asadi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	fractional viscoelastic damper seismic performance assessment temperature effect fragility curve weak steel frame Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/78b2358506634ab0b777d40f591b4be8
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id	oai:doaj.org-article:78b2358506634ab0b777d40f591b4be8
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spelling	oai:doaj.org-article:78b2358506634ab0b777d40f591b4be82021-11-08T15:54:19ZSeismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables2476-39772538-261610.22065/jsce.2019.171919.1785https://doaj.org/article/78b2358506634ab0b777d40f591b4be82021-03-01T00:00:00Zhttps://www.jsce.ir/article_87634_b127a2604c2c614b035eb9a60480c7fc.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Using viscoelastic (VE) dampers is one of the most effective tools for seismic retrofitting of steel structures. The results of many experimental studies demonstrated that using fractional derivative terms for modelling viscoelastic dampers offers an acceptable level of accuracy. Unlike viscous dampers the damping force is not linearly dependent to velocity and it is also highly affected by excitation frequency and ambient temperature. For this reason, solving the dynamic equation and calculating the seismic response of the structures equipped with VE dampers have many complexities. In this paper, the responses of a viscoelastically damped structure are calculated and the seismic performance of the building is evaluated while considering the effects ambient temperature as well as the inherent uncertainties related to ground motion excitation. The proposed relationships were used to calculate the structural responses and assess the seismic performance of a 5-story steel structure retrofitted with fractional viscoelastic dampers. The maximum relative displacement of the controlled structural at the operation, design, and maximum considered expected hazard levels were compared to those of the initial structure (without damper). Furthermore, fragility curves were used to compare responses and exceedance probabilities of performance limit states. The results show great improvement in structural seismic performance related to the reduction of both structural responses and exceedance probabilities of limit states. The effect of temperature changes in results has been also demonstrated.Maryam BeheshtiPayam AsadiIranian Society of Structrual Engineering (ISSE)articlefractional viscoelastic damperseismic performance assessmenttemperature effectfragility curveweak steel frameBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 1, Pp 271-285 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	fractional viscoelastic damper seismic performance assessment temperature effect fragility curve weak steel frame Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	fractional viscoelastic damper seismic performance assessment temperature effect fragility curve weak steel frame Bridge engineering TG1-470 Building construction TH1-9745 Maryam Beheshti Payam Asadi Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables
description	Using viscoelastic (VE) dampers is one of the most effective tools for seismic retrofitting of steel structures. The results of many experimental studies demonstrated that using fractional derivative terms for modelling viscoelastic dampers offers an acceptable level of accuracy. Unlike viscous dampers the damping force is not linearly dependent to velocity and it is also highly affected by excitation frequency and ambient temperature. For this reason, solving the dynamic equation and calculating the seismic response of the structures equipped with VE dampers have many complexities. In this paper, the responses of a viscoelastically damped structure are calculated and the seismic performance of the building is evaluated while considering the effects ambient temperature as well as the inherent uncertainties related to ground motion excitation. The proposed relationships were used to calculate the structural responses and assess the seismic performance of a 5-story steel structure retrofitted with fractional viscoelastic dampers. The maximum relative displacement of the controlled structural at the operation, design, and maximum considered expected hazard levels were compared to those of the initial structure (without damper). Furthermore, fragility curves were used to compare responses and exceedance probabilities of performance limit states. The results show great improvement in structural seismic performance related to the reduction of both structural responses and exceedance probabilities of limit states. The effect of temperature changes in results has been also demonstrated.
format	article
author	Maryam Beheshti Payam Asadi
author_facet	Maryam Beheshti Payam Asadi
author_sort	Maryam Beheshti
title	Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables
title_short	Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables
title_full	Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables
title_fullStr	Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables
title_full_unstemmed	Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables
title_sort	seismic vulnerability assessment of retrofitted steel structures with fractional viscoelastic dampers considering uncertainty variables
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/78b2358506634ab0b777d40f591b4be8
work_keys_str_mv	AT maryambeheshti seismicvulnerabilityassessmentofretrofittedsteelstructureswithfractionalviscoelasticdampersconsideringuncertaintyvariables AT payamasadi seismicvulnerabilityassessmentofretrofittedsteelstructureswithfractionalviscoelasticdampersconsideringuncertaintyvariables
_version_	1718441576610398208

Seismic Vulnerability Assessment of Retrofitted Steel Structures with Fractional Viscoelastic Dampers Considering Uncertainty Variables

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