Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites

The high depth created favorable space for placing the openings which are to provide some capabilities such as mechanical and electrical installations, but these openings reduced load bearing capacity of the beams. One solution to the mentioned shortcoming is to use FRP-Composite sheets; the effect...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Abolfazl Arabzadeh, Hamid Karimizadeh
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	reinforced concrete deep beams opening cfrp composites ebr method ebrog method Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/f073d289f1264934935da5be6279f42f
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:f073d289f1264934935da5be6279f42f
record_format	dspace
spelling	oai:doaj.org-article:f073d289f1264934935da5be6279f42f2021-11-08T15:54:49ZShear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites2476-39772538-261610.22065/jsce.2020.200210.1941https://doaj.org/article/f073d289f1264934935da5be6279f42f2021-06-01T00:00:00Zhttps://www.jsce.ir/article_103201_67acd5770f2f1a5a51493c1a29beeba7.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616The high depth created favorable space for placing the openings which are to provide some capabilities such as mechanical and electrical installations, but these openings reduced load bearing capacity of the beams. One solution to the mentioned shortcoming is to use FRP-Composite sheets; the effect of FRP-Composites in improving load bearing and ductility of concrete members such as columns and beams is approved in previous investigations. This study utilizes the CFRP sheets to compensate for weakness arisen from the created openings. To this end, 5 deep beams with 10x50x120 cm dimensions, each having two circular openings with 20 cm diameter placed in symmetrical order, are constructed and undergone a three-point monotonic bending. The Externally Bounded Reinforcement (EBR) and Externally Bounded Reinforcement on Grooves (EBROG) methods have been utilized to install the FRP sheets in two configurations being wrapped around and inclined. The results have shown the superiority of EBROG method as well as the efficiency of the inclined orientation of strengthening sheets in increasing the load bearing-capacity. Also, Shear failure was the type of failure in beams and it has been observed that generally, diagonal cracks, which lead to the strut formation, tend to be formed in the beams. The cracks started from the support plates and propagated towards the loading plate. In addition to the extended cracking, the strengthened specimens have experienced debonding and failure in their composite strips. The strengthening strips have experienced failure in the wrapped specimen as a result of providing suitable confinement and leaving no chance for strip debonding as well as in the specimen with inclined strengthening strips as a result of the high efficiency of tensile stresses on the strips. Compared to the related non- strengthened specimens, the load bearing capacity increase arising from inclined orientation is 40% to 43%. In addition, this amount compared to the wrapped around specimen is about 16%.Abolfazl ArabzadehHamid KarimizadehIranian Society of Structrual Engineering (ISSE)articlereinforced concrete deep beamsopeningcfrp compositesebr methodebrog methodBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 4, Pp 45-65 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	reinforced concrete deep beams opening cfrp composites ebr method ebrog method Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	reinforced concrete deep beams opening cfrp composites ebr method ebrog method Bridge engineering TG1-470 Building construction TH1-9745 Abolfazl Arabzadeh Hamid Karimizadeh Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites
description	The high depth created favorable space for placing the openings which are to provide some capabilities such as mechanical and electrical installations, but these openings reduced load bearing capacity of the beams. One solution to the mentioned shortcoming is to use FRP-Composite sheets; the effect of FRP-Composites in improving load bearing and ductility of concrete members such as columns and beams is approved in previous investigations. This study utilizes the CFRP sheets to compensate for weakness arisen from the created openings. To this end, 5 deep beams with 10x50x120 cm dimensions, each having two circular openings with 20 cm diameter placed in symmetrical order, are constructed and undergone a three-point monotonic bending. The Externally Bounded Reinforcement (EBR) and Externally Bounded Reinforcement on Grooves (EBROG) methods have been utilized to install the FRP sheets in two configurations being wrapped around and inclined. The results have shown the superiority of EBROG method as well as the efficiency of the inclined orientation of strengthening sheets in increasing the load bearing-capacity. Also, Shear failure was the type of failure in beams and it has been observed that generally, diagonal cracks, which lead to the strut formation, tend to be formed in the beams. The cracks started from the support plates and propagated towards the loading plate. In addition to the extended cracking, the strengthened specimens have experienced debonding and failure in their composite strips. The strengthening strips have experienced failure in the wrapped specimen as a result of providing suitable confinement and leaving no chance for strip debonding as well as in the specimen with inclined strengthening strips as a result of the high efficiency of tensile stresses on the strips. Compared to the related non- strengthened specimens, the load bearing capacity increase arising from inclined orientation is 40% to 43%. In addition, this amount compared to the wrapped around specimen is about 16%.
format	article
author	Abolfazl Arabzadeh Hamid Karimizadeh
author_facet	Abolfazl Arabzadeh Hamid Karimizadeh
author_sort	Abolfazl Arabzadeh
title	Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites
title_short	Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites
title_full	Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites
title_fullStr	Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites
title_full_unstemmed	Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites
title_sort	shear strengthening of rc deep beams with circular openings by means frp composites
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/f073d289f1264934935da5be6279f42f
work_keys_str_mv	AT abolfazlarabzadeh shearstrengtheningofrcdeepbeamswithcircularopeningsbymeansfrpcomposites AT hamidkarimizadeh shearstrengtheningofrcdeepbeamswithcircularopeningsbymeansfrpcomposites
_version_	1718441623971430400

Shear Strengthening of RC Deep Beams with Circular Openings by Means FRP Composites

Ejemplares similares