Ductility Evaluation of inverted V-bracing and concentrically bracing systems

The current design philosophy for buildings located in zones with high seismic risks is that the buildings must have sufficient strength and stiffness to remain elastic and serviceable under moderate but frequently occurring earthquakes and to have sufficient ductility to prevent collapse under extr...

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Autor principal:	Abazar Asghari
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2019
Materias:	ductility ductility reduction factor concentrically v-braced frame pushover analysis target displacement Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/7403bd4f4f734012b9b3830adb366452
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spelling	oai:doaj.org-article:7403bd4f4f734012b9b3830adb3664522021-11-08T15:52:40ZDuctility Evaluation of inverted V-bracing and concentrically bracing systems2476-39772538-261610.22065/jsce.2018.109599.1402https://doaj.org/article/7403bd4f4f734012b9b3830adb3664522019-08-01T00:00:00Zhttps://www.jsce.ir/article_60363_89c1a82b2517ef0c08f9d7952277fc84.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616The current design philosophy for buildings located in zones with high seismic risks is that the buildings must have sufficient strength and stiffness to remain elastic and serviceable under moderate but frequently occurring earthquakes and to have sufficient ductility to prevent collapse under extreme earthquakes. Conventional structural steel framing systems such as moment resisting frames (MRFs), concentrically braced frames (CBFs), and eccentrically braced frames (EBFs) I extensively used in seismically active areas. Each of the previously mentioned structural systems has different advantages and disadvantages.In this study, response modification factor of ordinary inverted V-braced frames and specially inverted V-braced frames are evaluated, result confirm that the proposed height for buildings with ordinary inverted braced frames in the ASCE7,can be increased up to 10.7 meter. also results indicate that by using ordinary inverted V-bracing systems in buildings .their height can be increased up to 6 story or 20 meter. Using special inverted V-braced systems can have saving about 0 to 30 percent on used materials for frames from 1 story to 16 stories. According to the results of this study, response modification factor proposed by Iranian seismic design code (2800 standard fourth edition),(R=5.5), is more logical than the one which is proposed by ASCE7, (R=6). Unfortunately, in special inverted V-braced frames, and when the story of the frames increases up to 12 stories, ductility demand can't be achieved .So as a result for frames which are more than 12 stories tall, lower response modification factor should be used. In addition, frames taller than 12 story height don’t experience specified target displacement and collapse before getting to preferred mechanism. This phenomenon shows the necessity of using different response modification factor for frames taller than 12 stories.Abazar AsghariIranian Society of Structrual Engineering (ISSE)articleductilityductility reduction factorconcentrically v-braced framepushover analysistarget displacementBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 6, Iss شماره ویژه 2, Pp 175-190 (2019)
institution	DOAJ
collection	DOAJ
language	FA
topic	ductility ductility reduction factor concentrically v-braced frame pushover analysis target displacement Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	ductility ductility reduction factor concentrically v-braced frame pushover analysis target displacement Bridge engineering TG1-470 Building construction TH1-9745 Abazar Asghari Ductility Evaluation of inverted V-bracing and concentrically bracing systems
description	The current design philosophy for buildings located in zones with high seismic risks is that the buildings must have sufficient strength and stiffness to remain elastic and serviceable under moderate but frequently occurring earthquakes and to have sufficient ductility to prevent collapse under extreme earthquakes. Conventional structural steel framing systems such as moment resisting frames (MRFs), concentrically braced frames (CBFs), and eccentrically braced frames (EBFs) I extensively used in seismically active areas. Each of the previously mentioned structural systems has different advantages and disadvantages.In this study, response modification factor of ordinary inverted V-braced frames and specially inverted V-braced frames are evaluated, result confirm that the proposed height for buildings with ordinary inverted braced frames in the ASCE7,can be increased up to 10.7 meter. also results indicate that by using ordinary inverted V-bracing systems in buildings .their height can be increased up to 6 story or 20 meter. Using special inverted V-braced systems can have saving about 0 to 30 percent on used materials for frames from 1 story to 16 stories. According to the results of this study, response modification factor proposed by Iranian seismic design code (2800 standard fourth edition),(R=5.5), is more logical than the one which is proposed by ASCE7, (R=6). Unfortunately, in special inverted V-braced frames, and when the story of the frames increases up to 12 stories, ductility demand can't be achieved .So as a result for frames which are more than 12 stories tall, lower response modification factor should be used. In addition, frames taller than 12 story height don’t experience specified target displacement and collapse before getting to preferred mechanism. This phenomenon shows the necessity of using different response modification factor for frames taller than 12 stories.
format	article
author	Abazar Asghari
author_facet	Abazar Asghari
author_sort	Abazar Asghari
title	Ductility Evaluation of inverted V-bracing and concentrically bracing systems
title_short	Ductility Evaluation of inverted V-bracing and concentrically bracing systems
title_full	Ductility Evaluation of inverted V-bracing and concentrically bracing systems
title_fullStr	Ductility Evaluation of inverted V-bracing and concentrically bracing systems
title_full_unstemmed	Ductility Evaluation of inverted V-bracing and concentrically bracing systems
title_sort	ductility evaluation of inverted v-bracing and concentrically bracing systems
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2019
url	https://doaj.org/article/7403bd4f4f734012b9b3830adb366452
work_keys_str_mv	AT abazarasghari ductilityevaluationofinvertedvbracingandconcentricallybracingsystems
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Ductility Evaluation of inverted V-bracing and concentrically bracing systems

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