Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System

This paper presents the test results of an experimental study that investigates the behavior of RC deep beams strengthened in shear with externally bonded (EB) and near surface mounted (NSM) techniques using CFRP strip. A total of 6 RC deep beams were constructed and tested under four-point bending....

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Autores principales:	Habib Akbarzadeh Bengar, Mohsen Ahmadnezhad, Mehdi Noroozi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2018
Materias:	rc deep beam shear strengthening cfrp eb nsm Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/1fdb2e12b66b4e6f8f2c1e1f8e6d3191
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spelling	oai:doaj.org-article:1fdb2e12b66b4e6f8f2c1e1f8e6d31912021-11-08T15:50:59ZExperimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System2476-39772538-261610.22065/jsce.2017.81471.1137https://doaj.org/article/1fdb2e12b66b4e6f8f2c1e1f8e6d31912018-11-01T00:00:00Zhttps://www.jsce.ir/article_51313_0440eafacd624ac88cdff3c1dad54b24.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616This paper presents the test results of an experimental study that investigates the behavior of RC deep beams strengthened in shear with externally bonded (EB) and near surface mounted (NSM) techniques using CFRP strip. A total of 6 RC deep beams were constructed and tested under four-point bending. Test specimen had a cross section of 150 × 500 mm and a total length of 1450 mm. This study included two parameters; techniques (NSM and EB) used for strengthening and amount of shear steel reinforcement ratio. All of the strengthened beams have the same CFRP configurations; and CFRP strips were bonded perpendicular to the diagonal connecting the loading and the support points. The specimens were divided into two groups based on the shear steel reinforcement ratio. There were three beams in each group. One of them was a control beam, the rest of the beams in each group were strengthened by EB or NSM techniques. The amount of CFRP strip in EB and NSM techniques is equal. All of the beams were loaded until failure and during the experiment, deflection and compressive strains of concrete, tensile strain of longitudinal steel bar at mid span and crack width of flexural and shear, were measured. The test results showed that shear strengthening of the deep RC beams with NSM technique causes to increase in ultimate load capacity and ultimate deflection capacity by 18% and 16% respectively, compared with the control beam. Also, the ultimate load capacity and ultimate deflection capacity of deep RC beams strengthened with NSM technique are 6% and 15% more than beams strengthened with NSM technique respectively. The concrete compressive strain at ultimate load of deep RC beams strengthened with NSM technique is 50% more than beams strengthened with NSM technique.Habib Akbarzadeh BengarMohsen AhmadnezhadMehdi NorooziIranian Society of Structrual Engineering (ISSE)articlerc deep beamshear strengtheningcfrpebnsmBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 5, Iss شماره ویژه 3, Pp 153-171 (2018)
institution	DOAJ
collection	DOAJ
language	FA
topic	rc deep beam shear strengthening cfrp eb nsm Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	rc deep beam shear strengthening cfrp eb nsm Bridge engineering TG1-470 Building construction TH1-9745 Habib Akbarzadeh Bengar Mohsen Ahmadnezhad Mehdi Noroozi Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System
description	This paper presents the test results of an experimental study that investigates the behavior of RC deep beams strengthened in shear with externally bonded (EB) and near surface mounted (NSM) techniques using CFRP strip. A total of 6 RC deep beams were constructed and tested under four-point bending. Test specimen had a cross section of 150 × 500 mm and a total length of 1450 mm. This study included two parameters; techniques (NSM and EB) used for strengthening and amount of shear steel reinforcement ratio. All of the strengthened beams have the same CFRP configurations; and CFRP strips were bonded perpendicular to the diagonal connecting the loading and the support points. The specimens were divided into two groups based on the shear steel reinforcement ratio. There were three beams in each group. One of them was a control beam, the rest of the beams in each group were strengthened by EB or NSM techniques. The amount of CFRP strip in EB and NSM techniques is equal. All of the beams were loaded until failure and during the experiment, deflection and compressive strains of concrete, tensile strain of longitudinal steel bar at mid span and crack width of flexural and shear, were measured. The test results showed that shear strengthening of the deep RC beams with NSM technique causes to increase in ultimate load capacity and ultimate deflection capacity by 18% and 16% respectively, compared with the control beam. Also, the ultimate load capacity and ultimate deflection capacity of deep RC beams strengthened with NSM technique are 6% and 15% more than beams strengthened with NSM technique respectively. The concrete compressive strain at ultimate load of deep RC beams strengthened with NSM technique is 50% more than beams strengthened with NSM technique.
format	article
author	Habib Akbarzadeh Bengar Mohsen Ahmadnezhad Mehdi Noroozi
author_facet	Habib Akbarzadeh Bengar Mohsen Ahmadnezhad Mehdi Noroozi
author_sort	Habib Akbarzadeh Bengar
title	Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System
title_short	Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System
title_full	Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System
title_fullStr	Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System
title_full_unstemmed	Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System
title_sort	experimental investigations of rc deep beams strengthened in shear using nsm cfrp system
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2018
url	https://doaj.org/article/1fdb2e12b66b4e6f8f2c1e1f8e6d3191
work_keys_str_mv	AT habibakbarzadehbengar experimentalinvestigationsofrcdeepbeamsstrengthenedinshearusingnsmcfrpsystem AT mohsenahmadnezhad experimentalinvestigationsofrcdeepbeamsstrengthenedinshearusingnsmcfrpsystem AT mehdinoroozi experimentalinvestigationsofrcdeepbeamsstrengthenedinshearusingnsmcfrpsystem
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Experimental Investigations of RC Deep Beams Strengthened in Shear using NSM CFRP System

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