The behaviour of buckling restrained brace system at elevated temperature

Buckling Restrained Braces (BRB) have been widely used in the construction industry as they utilize the most desirable properties of both constituent materials, i.e., steel and concrete. They present excellent structural behaviours such as high load bearing capacity, ductility, energy-absorption cap...

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Main Author:	Talebi, Elnaz
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/77932/1/ElnazTalebiPFKA2014.pdf
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id	my-utm-ep.77932
record_format	uketd_dc
spelling	my-utm-ep.779322018-07-23T06:00:22Z The behaviour of buckling restrained brace system at elevated temperature 2014-10 Talebi, Elnaz TA Engineering (General). Civil engineering (General) Buckling Restrained Braces (BRB) have been widely used in the construction industry as they utilize the most desirable properties of both constituent materials, i.e., steel and concrete. They present excellent structural behaviours such as high load bearing capacity, ductility, energy-absorption capability and good structural fire behaviour. In this study, the use of BRB systems on enhancing the fire resistance of whole building in terms of preventing the progressive collapse of the structural frame against fire was investigated. The effect of size and type of filler material of existed gap at the steel core-concrete interface as well as the element's cross sectional shape on the fire resistance of BRB isolated member was explored. The accuracy of numerical solution was certified by comparing the FE results with those of analytical formulations and experimental predictions. The study in this thesis shows that the superior fire performance of BRB can be obtained by altering the filler material of the gap from metal to concrete as well as by increasing the size of the gap. Also, cylindrical cross-section BRB perform better under fire conditions compared to that of rectangular cross section. In terms of verifying the efficiency of BRBs in preventing the progressive collapse of the structural frame under fire, a new framework called "stiffness reduction" technique was proposed and the response of BRBs was compared with that of Ordinary Concentrically Brace systems (OCBs). The results indicate that BRBs provide higher global collapse temperature of the frame, owing to the greater stiffness they append to the structural frame as compared to OCBs. Moreover, BRBs are strength enough to distribute the sustained load by heated columns to the adjacent members without any buckling occurrence in the bracing member, maintaining the stability of whole frame for a longer period of heating time through both heating and cooling phases of fire. 2014-10 Thesis http://eprints.utm.my/id/eprint/77932/ http://eprints.utm.my/id/eprint/77932/1/ElnazTalebiPFKA2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:98593 phd doctoral Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Talebi, Elnaz The behaviour of buckling restrained brace system at elevated temperature
description	Buckling Restrained Braces (BRB) have been widely used in the construction industry as they utilize the most desirable properties of both constituent materials, i.e., steel and concrete. They present excellent structural behaviours such as high load bearing capacity, ductility, energy-absorption capability and good structural fire behaviour. In this study, the use of BRB systems on enhancing the fire resistance of whole building in terms of preventing the progressive collapse of the structural frame against fire was investigated. The effect of size and type of filler material of existed gap at the steel core-concrete interface as well as the element's cross sectional shape on the fire resistance of BRB isolated member was explored. The accuracy of numerical solution was certified by comparing the FE results with those of analytical formulations and experimental predictions. The study in this thesis shows that the superior fire performance of BRB can be obtained by altering the filler material of the gap from metal to concrete as well as by increasing the size of the gap. Also, cylindrical cross-section BRB perform better under fire conditions compared to that of rectangular cross section. In terms of verifying the efficiency of BRBs in preventing the progressive collapse of the structural frame under fire, a new framework called "stiffness reduction" technique was proposed and the response of BRBs was compared with that of Ordinary Concentrically Brace systems (OCBs). The results indicate that BRBs provide higher global collapse temperature of the frame, owing to the greater stiffness they append to the structural frame as compared to OCBs. Moreover, BRBs are strength enough to distribute the sustained load by heated columns to the adjacent members without any buckling occurrence in the bracing member, maintaining the stability of whole frame for a longer period of heating time through both heating and cooling phases of fire.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Talebi, Elnaz
author_facet	Talebi, Elnaz
author_sort	Talebi, Elnaz
title	The behaviour of buckling restrained brace system at elevated temperature
title_short	The behaviour of buckling restrained brace system at elevated temperature
title_full	The behaviour of buckling restrained brace system at elevated temperature
title_fullStr	The behaviour of buckling restrained brace system at elevated temperature
title_full_unstemmed	The behaviour of buckling restrained brace system at elevated temperature
title_sort	behaviour of buckling restrained brace system at elevated temperature
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/77932/1/ElnazTalebiPFKA2014.pdf
_version_	1747817866162339840

The behaviour of buckling restrained brace system at elevated temperature

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