Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses

In this paper the effects of mass eccentricity of superstructure as well as stiffness eccentricity of isolators on the amplification of seismic responses of base-isolated structures are investigated. Superstructures with 3, 6 and 9 stories and aspect ratios equal to 1, 2 and 3 are mounted on a Tripl...

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Autores principales:	Hamed Tajammolian, Faramarz Khoshnoudian
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2017
Materias:	tcfp isolator near-fault simplified pulse eccentricity torsion Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/e60ffc223e9048409371e706e7d6e634
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spelling	oai:doaj.org-article:e60ffc223e9048409371e706e7d6e6342021-11-08T15:47:38ZSeismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses2476-39772538-261610.22065/jsce.2017.86483.1197https://doaj.org/article/e60ffc223e9048409371e706e7d6e6342017-07-01T00:00:00Zhttps://www.jsce.ir/article_46853_373b733619470526d574a2190c03734c.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616In this paper the effects of mass eccentricity of superstructure as well as stiffness eccentricity of isolators on the amplification of seismic responses of base-isolated structures are investigated. Superstructures with 3, 6 and 9 stories and aspect ratios equal to 1, 2 and 3 are mounted on a Triple Concave Friction Pendulum (TCFP) bearing. Three-dimensional linear model of superstructure mounted on nonlinear isolators are subjected to simplified pulses including fling step and forward directivity while various pulse period (Tp) and Peak Ground Velocity (PGV) amounts are scrutinized. Maximum isolator displacement and base shear as well as peak superstructure acceleration and drift are selected as the main engineering demand parameters. The results indicate that the torsional intensification of different demand parameters caused by superstructure mass eccentricity is more significant than isolator stiffness eccentricity. The torsion due to mass eccentricity has intensified the base shear of asymmetric 6-story model 2.55 times comparing to symmetric one. In similar circumstances, the isolator displacement and roof acceleration are increased 1.49 and 2.16 times respectively in the presence of mass eccentricity. Furthermore, it is demonstrated that torsional effects of mass eccentricity can force the drift to reach the allowable limit of ASCE 7 standard in the presence of forward directivity pulses. This aspect should be noted in the design of base-isolated buildings.Hamed TajammolianFaramarz KhoshnoudianIranian Society of Structrual Engineering (ISSE)articletcfp isolatornear-faultsimplified pulseeccentricitytorsionBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 4, Iss شماره ویژه 1, Pp 48-57 (2017)
institution	DOAJ
collection	DOAJ
language	FA
topic	tcfp isolator near-fault simplified pulse eccentricity torsion Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	tcfp isolator near-fault simplified pulse eccentricity torsion Bridge engineering TG1-470 Building construction TH1-9745 Hamed Tajammolian Faramarz Khoshnoudian Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses
description	In this paper the effects of mass eccentricity of superstructure as well as stiffness eccentricity of isolators on the amplification of seismic responses of base-isolated structures are investigated. Superstructures with 3, 6 and 9 stories and aspect ratios equal to 1, 2 and 3 are mounted on a Triple Concave Friction Pendulum (TCFP) bearing. Three-dimensional linear model of superstructure mounted on nonlinear isolators are subjected to simplified pulses including fling step and forward directivity while various pulse period (Tp) and Peak Ground Velocity (PGV) amounts are scrutinized. Maximum isolator displacement and base shear as well as peak superstructure acceleration and drift are selected as the main engineering demand parameters. The results indicate that the torsional intensification of different demand parameters caused by superstructure mass eccentricity is more significant than isolator stiffness eccentricity. The torsion due to mass eccentricity has intensified the base shear of asymmetric 6-story model 2.55 times comparing to symmetric one. In similar circumstances, the isolator displacement and roof acceleration are increased 1.49 and 2.16 times respectively in the presence of mass eccentricity. Furthermore, it is demonstrated that torsional effects of mass eccentricity can force the drift to reach the allowable limit of ASCE 7 standard in the presence of forward directivity pulses. This aspect should be noted in the design of base-isolated buildings.
format	article
author	Hamed Tajammolian Faramarz Khoshnoudian
author_facet	Hamed Tajammolian Faramarz Khoshnoudian
author_sort	Hamed Tajammolian
title	Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses
title_short	Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses
title_full	Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses
title_fullStr	Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses
title_full_unstemmed	Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses
title_sort	seismic behavior of asymmetric structures supported on tcfp bearings subjected to simplified near-fault pulses
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2017
url	https://doaj.org/article/e60ffc223e9048409371e706e7d6e634
work_keys_str_mv	AT hamedtajammolian seismicbehaviorofasymmetricstructuressupportedontcfpbearingssubjectedtosimplifiednearfaultpulses AT faramarzkhoshnoudian seismicbehaviorofasymmetricstructuressupportedontcfpbearingssubjectedtosimplifiednearfaultpulses
_version_	1718441709795278848

Seismic behavior of asymmetric structures supported on TCFP bearings subjected to simplified near-fault pulses

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