Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions

Iranian Seismic design code (standard No. 2800) increases the design spectrum ordinates by a modification factor (N factor), to consider the damaging effects of near fault ground motions in design procedure of structures. Accordingly, the spectrum modification factor depends on fundamental period of...

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Autores principales:	Reza Vahdani, Mohsen Gerami, Morteza Razi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2018
Materias:	design spectrum modification near fault ground motions steel moment frame incremental dynamic analysis iranian seismic design code Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/07292acf36044f648878e401e4e6d6fc
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spelling	oai:doaj.org-article:07292acf36044f648878e401e4e6d6fc2021-11-08T15:47:59ZAssessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions2476-39772538-261610.22065/jsce.2017.75560.1068https://doaj.org/article/07292acf36044f648878e401e4e6d6fc2018-06-01T00:00:00Zhttps://www.jsce.ir/article_46869_1ad1122edd42990daec48ca30105ced1.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Iranian Seismic design code (standard No. 2800) increases the design spectrum ordinates by a modification factor (N factor), to consider the damaging effects of near fault ground motions in design procedure of structures. Accordingly, the spectrum modification factor depends on fundamental period of vibration and seismicity level of the region. In this paper, the preciseness of the expression given by Iranian seismic design code for calculation of spectrum modification factor is examined and estimations are suggested for N factor by evaluating the near fault effects on inelastic seismic response of steel moment-resisting frames. For this purpose, the response spectrum shape and nonlinear seismic response of sample structures are evaluated for one set of far fault and three different sets of near fault ground motions. Incremental dynamic analysis is utilized to obtain the seismic response of the sample frames (including five steel frames with 3 to 15 stories) in various intensity levels. The results of the study demonstrate that modification factors provided by standard No. 2800 does not precisely take account the effects of near fault excitations on inelastic seismic response of steel moment-resisting frame structures. Also, it was found that there is no meaningful relationship between spectrum modification factor and structural period.Reza VahdaniMohsen GeramiMorteza RaziIranian Society of Structrual Engineering (ISSE)articledesign spectrum modificationnear fault ground motionssteel moment frameincremental dynamic analysisiranian seismic design codeBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 5, Iss 1, Pp 71-87 (2018)
institution	DOAJ
collection	DOAJ
language	FA
topic	design spectrum modification near fault ground motions steel moment frame incremental dynamic analysis iranian seismic design code Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	design spectrum modification near fault ground motions steel moment frame incremental dynamic analysis iranian seismic design code Bridge engineering TG1-470 Building construction TH1-9745 Reza Vahdani Mohsen Gerami Morteza Razi Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions
description	Iranian Seismic design code (standard No. 2800) increases the design spectrum ordinates by a modification factor (N factor), to consider the damaging effects of near fault ground motions in design procedure of structures. Accordingly, the spectrum modification factor depends on fundamental period of vibration and seismicity level of the region. In this paper, the preciseness of the expression given by Iranian seismic design code for calculation of spectrum modification factor is examined and estimations are suggested for N factor by evaluating the near fault effects on inelastic seismic response of steel moment-resisting frames. For this purpose, the response spectrum shape and nonlinear seismic response of sample structures are evaluated for one set of far fault and three different sets of near fault ground motions. Incremental dynamic analysis is utilized to obtain the seismic response of the sample frames (including five steel frames with 3 to 15 stories) in various intensity levels. The results of the study demonstrate that modification factors provided by standard No. 2800 does not precisely take account the effects of near fault excitations on inelastic seismic response of steel moment-resisting frame structures. Also, it was found that there is no meaningful relationship between spectrum modification factor and structural period.
format	article
author	Reza Vahdani Mohsen Gerami Morteza Razi
author_facet	Reza Vahdani Mohsen Gerami Morteza Razi
author_sort	Reza Vahdani
title	Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions
title_short	Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions
title_full	Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions
title_fullStr	Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions
title_full_unstemmed	Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions
title_sort	assessment of spectrum modification factor for design of steel moment frames in near fault regions
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2018
url	https://doaj.org/article/07292acf36044f648878e401e4e6d6fc
work_keys_str_mv	AT rezavahdani assessmentofspectrummodificationfactorfordesignofsteelmomentframesinnearfaultregions AT mohsengerami assessmentofspectrummodificationfactorfordesignofsteelmomentframesinnearfaultregions AT mortezarazi assessmentofspectrummodificationfactorfordesignofsteelmomentframesinnearfaultregions
_version_	1718441632389398528

Assessment of Spectrum Modification Factor for Design of Steel Moment Frames in Near Fault Regions

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