Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration

Using central core system with peripheral columns and outrigger and employing the energy dissipation devices, such as viscous damper, is one of the structure lateral displacement mitigation’s methods. The central core system with the damped outrigger under seismic loads can be assessed by transverse...

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Autores principales:	Majid Amin Afshar, mohammad mahdi memarpour, Bahador Khanlari
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2020
Materias:	tall building damped outrigger optimization structural control eigen value analysis complex frequency Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/2a4a3023bf46462a93771c684a7880b4
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spelling	oai:doaj.org-article:2a4a3023bf46462a93771c684a7880b42021-11-08T15:53:54ZOptimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration2476-39772538-261610.22065/jsce.2019.138049.1601https://doaj.org/article/2a4a3023bf46462a93771c684a7880b42020-07-01T00:00:00Zhttps://www.jsce.ir/article_81253_d58b1df2794477cb138abd1e1799c13c.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Using central core system with peripheral columns and outrigger and employing the energy dissipation devices, such as viscous damper, is one of the structure lateral displacement mitigation’s methods. The central core system with the damped outrigger under seismic loads can be assessed by transverse vibration of a cantilever beam subjected to a concentrated moment due to spring-damper system. In this paper, two models are proposed for damped outrigger. After obtaining differential equation of vibration of a beam interacted with damped outrigger modeled as viscous and viscoelastic, and eigen value analysis, characteristic equations are derived. Complex frequencies and mode shapes are obtained with respect to non-dimensional parameters such as damping ratio and outrigger location and results are presented as modal damping ratio surfaces versus damping ratio and outrigger location and so optimal of these parameters for each mode are attained. The optimal locations of outrigger at first mode are 0.47 and 0.5 of the building height for viscous and viscoelastic models, respectively. In second mode, this value is 0.8 for both models. Analyzing a finite element model of a 40-story building and comparing frequency responses of the optimal and non-optimized models and the undamped models including the traditional outrigger and traditional core system without outrigger, validity of the proposed method is verified. The maximum of roof displacement in viscous and viscoelastic models are respectively about 16.4 cm and 1.1 cm, while it exceeds than the criteria of 1/400 of building’s height in the undamped models. In spite of greater modal damping ratio of viscous model, performance of the viscoelastic model is better. This is an indication of unrealistic viscosity model.Majid Amin Afsharmohammad mahdi memarpourBahador KhanlariIranian Society of Structrual Engineering (ISSE)articletall buildingdamped outriggeroptimizationstructural controleigen value analysiscomplex frequencyBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 7, Iss شماره ویژه 2 (2020)
institution	DOAJ
collection	DOAJ
language	FA
topic	tall building damped outrigger optimization structural control eigen value analysis complex frequency Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	tall building damped outrigger optimization structural control eigen value analysis complex frequency Bridge engineering TG1-470 Building construction TH1-9745 Majid Amin Afshar mohammad mahdi memarpour Bahador Khanlari Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration
description	Using central core system with peripheral columns and outrigger and employing the energy dissipation devices, such as viscous damper, is one of the structure lateral displacement mitigation’s methods. The central core system with the damped outrigger under seismic loads can be assessed by transverse vibration of a cantilever beam subjected to a concentrated moment due to spring-damper system. In this paper, two models are proposed for damped outrigger. After obtaining differential equation of vibration of a beam interacted with damped outrigger modeled as viscous and viscoelastic, and eigen value analysis, characteristic equations are derived. Complex frequencies and mode shapes are obtained with respect to non-dimensional parameters such as damping ratio and outrigger location and results are presented as modal damping ratio surfaces versus damping ratio and outrigger location and so optimal of these parameters for each mode are attained. The optimal locations of outrigger at first mode are 0.47 and 0.5 of the building height for viscous and viscoelastic models, respectively. In second mode, this value is 0.8 for both models. Analyzing a finite element model of a 40-story building and comparing frequency responses of the optimal and non-optimized models and the undamped models including the traditional outrigger and traditional core system without outrigger, validity of the proposed method is verified. The maximum of roof displacement in viscous and viscoelastic models are respectively about 16.4 cm and 1.1 cm, while it exceeds than the criteria of 1/400 of building’s height in the undamped models. In spite of greater modal damping ratio of viscous model, performance of the viscoelastic model is better. This is an indication of unrealistic viscosity model.
format	article
author	Majid Amin Afshar mohammad mahdi memarpour Bahador Khanlari
author_facet	Majid Amin Afshar mohammad mahdi memarpour Bahador Khanlari
author_sort	Majid Amin Afshar
title	Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration
title_short	Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration
title_full	Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration
title_fullStr	Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration
title_full_unstemmed	Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration
title_sort	optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic kelvin-voigt models under lateral vibration
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2020
url	https://doaj.org/article/2a4a3023bf46462a93771c684a7880b4
work_keys_str_mv	AT majidaminafshar optimalperformancecomparisonoftallbuildingswithdampedoutriggersystembyviscousandviscoelastickelvinvoigtmodelsunderlateralvibration AT mohammadmahdimemarpour optimalperformancecomparisonoftallbuildingswithdampedoutriggersystembyviscousandviscoelastickelvinvoigtmodelsunderlateralvibration AT bahadorkhanlari optimalperformancecomparisonoftallbuildingswithdampedoutriggersystembyviscousandviscoelastickelvinvoigtmodelsunderlateralvibration
_version_	1718441555399802880

Optimal performance comparison of tall buildings with damped outrigger system by viscous and viscoelastic Kelvin-Voigt models under lateral vibration

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