Proposal for seismic design coefficients for rocking steel braced frame

Rocking steel braced frames are capable of reducing seismic damage through directing damage in energy dissipation elements. This paper quantifies seismic design factors for the controlled rocking self-centering braced frame including response modification, over-strength, and ductility parameters thr...

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Autores principales:	Navid Rahgozar, Abdolreza S Moghadam
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2019
Materias:	rocking braced steel frame seismic design parameters collapse assessment collapse margin ratio fragility curve Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/ded80677ce7c4c618177d0d913de3f0a
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spelling	oai:doaj.org-article:ded80677ce7c4c618177d0d913de3f0a2021-11-08T15:50:45ZProposal for seismic design coefficients for rocking steel braced frame2476-39772538-261610.22065/jsce.2017.75463.1067https://doaj.org/article/ded80677ce7c4c618177d0d913de3f0a2019-02-01T00:00:00Zhttps://www.jsce.ir/article_87083_2b7d1a150fcb56acf862b6ecf50a6a6b.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Rocking steel braced frames are capable of reducing seismic damage through directing damage in energy dissipation elements. This paper quantifies seismic design factors for the controlled rocking self-centering braced frame including response modification, over-strength, and ductility parameters through probabilistic safety assessment methodology. For this purpose, twelve self-centering braced frames differ from the number of stories, plan location, and site class is designed. A nonlinear model is developed for the rocking braced steel frame in Opensees software to simulate the degrading and collapse of the frame and its components (post-tensioning strands and yielding replaceable damper). Over-strength and ductility factors of self-centering systems are determined using nonlinear static analysis. The incremental dynamic analysis is conducted to obtain collapse limit state fragility curves of self-centering frames. Considering total uncertainty and effects of spectral shape, the fragility curves are modified. Through modified fragility curves, proposed response modification factor is verified by comparing the adjusted collapse margin ratio with its acceptance criteria. Finally, the effects of modeling and seismic parameters on the collapse probability of the system are examined. Results indicate that controlled rocking systems are satisfied acceptance criteria and the design of the system with the proposed coefficients provide sufficient safety margin against collapse.Navid RahgozarAbdolreza S MoghadamIranian Society of Structrual Engineering (ISSE)articlerocking braced steel frameseismic design parameterscollapse assessmentcollapse margin ratiofragility curveBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 5, Iss 4, Pp 23-40 (2019)
institution	DOAJ
collection	DOAJ
language	FA
topic	rocking braced steel frame seismic design parameters collapse assessment collapse margin ratio fragility curve Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	rocking braced steel frame seismic design parameters collapse assessment collapse margin ratio fragility curve Bridge engineering TG1-470 Building construction TH1-9745 Navid Rahgozar Abdolreza S Moghadam Proposal for seismic design coefficients for rocking steel braced frame
description	Rocking steel braced frames are capable of reducing seismic damage through directing damage in energy dissipation elements. This paper quantifies seismic design factors for the controlled rocking self-centering braced frame including response modification, over-strength, and ductility parameters through probabilistic safety assessment methodology. For this purpose, twelve self-centering braced frames differ from the number of stories, plan location, and site class is designed. A nonlinear model is developed for the rocking braced steel frame in Opensees software to simulate the degrading and collapse of the frame and its components (post-tensioning strands and yielding replaceable damper). Over-strength and ductility factors of self-centering systems are determined using nonlinear static analysis. The incremental dynamic analysis is conducted to obtain collapse limit state fragility curves of self-centering frames. Considering total uncertainty and effects of spectral shape, the fragility curves are modified. Through modified fragility curves, proposed response modification factor is verified by comparing the adjusted collapse margin ratio with its acceptance criteria. Finally, the effects of modeling and seismic parameters on the collapse probability of the system are examined. Results indicate that controlled rocking systems are satisfied acceptance criteria and the design of the system with the proposed coefficients provide sufficient safety margin against collapse.
format	article
author	Navid Rahgozar Abdolreza S Moghadam
author_facet	Navid Rahgozar Abdolreza S Moghadam
author_sort	Navid Rahgozar
title	Proposal for seismic design coefficients for rocking steel braced frame
title_short	Proposal for seismic design coefficients for rocking steel braced frame
title_full	Proposal for seismic design coefficients for rocking steel braced frame
title_fullStr	Proposal for seismic design coefficients for rocking steel braced frame
title_full_unstemmed	Proposal for seismic design coefficients for rocking steel braced frame
title_sort	proposal for seismic design coefficients for rocking steel braced frame
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2019
url	https://doaj.org/article/ded80677ce7c4c618177d0d913de3f0a
work_keys_str_mv	AT navidrahgozar proposalforseismicdesigncoefficientsforrockingsteelbracedframe AT abdolrezasmoghadam proposalforseismicdesigncoefficientsforrockingsteelbracedframe
_version_	1718441707292327936

Proposal for seismic design coefficients for rocking steel braced frame

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