Near surface mounted CFRP laminates for shear strengthening of concrete beams

Detalhes bibliográficos
Autor(a) principal: Barros, Joaquim A. O.
Data de Publicação: 2006
Outros Autores: Dias, Salvador J. E.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/5964
Resumo: The authors wish to acknowledge the supports provided by the S&P, BeTTor MBT Portugal, Secil (Unibetão), and the colaboration of Cemacom.
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spelling Near surface mounted CFRP laminates for shear strengthening of concrete beamsCarbon fiber reinforced PolymersConcreteSteel stirrupsShear strengtheningShear failureNear surface mounted (NSM)Science & TechnologyThe authors wish to acknowledge the supports provided by the S&P, BeTTor MBT Portugal, Secil (Unibetão), and the colaboration of Cemacom.A Near Surface Mounted (NSM) strengthening technique was developed to increase the shear resistance of concrete beams. The NSM technique is based on fixing, by epoxy adhesive, Carbon Fiber Reinforced Polymer (CFRP) laminate strips into pre-cut slits opened in the concrete cover of lateral surfaces of the beams. To assess the efficacy of this technique, an experimental program of four-point bending tests was carried out with reinforced concrete beams failing in shear. Each of the four tested series was composed of five beams: without any shear reinforcement; reinforced with steel stirrups; strengthened with strips of wet lay-up CFRP sheets; and two beams strengthened with NSM precured laminate strips of CFRP, one of them with laminates positioned at 90º and the other with laminates positioned at 45º in relation to the beam axis. Influences of the laminate strip inclination, beam depth and longitudinal tensile steel reinforcement ratio on the efficacy of the strengthening techniques were analyzed. Amongst the CFRP strengthening techniques, the NSM with laminate strips at 45º was the most effective, not only in terms of increasing beam shear resistance but also in assuring larger deformation capacity at beam failure. This technique was also faster and easier to apply than the externally bonded one. The performance of the ACI and fib analytical formulations for the EBR shear strengthening was appraised. In general, the contribution of the CFRP systems predicted by the analytical formulations was slightly larger than the values registered experimentally. Performance of the formulation by Nanni et al. for NSM strengthening technique was also appraised. Using bond stress and CFRP effective strain values obtained in pullout bending tests with NSM CFRP laminate system, the formulation by Nanni et al. predicted a contribution of this CFRP system for the beam shear resistance of 72% the experimentally recorded values.The study reported in this paper forms a part of the research program “CUTINSHEAR - Performance assessment of an innovative structural FRP strengthening technique using an integrated system based on optical fiber sensors” supported by FCT, POCTI/ECM/59033/2004.ElsevierUniversidade do MinhoBarros, Joaquim A. O.Dias, Salvador J. E.2006-032006-03-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/5964eng"Journal cement and concrete composites". ISSN 0958-9465. 28:3 (Mar. 2006) 276-292.0958-946510.1016/j.cemconcomp.2005.11.003www.elsevier.com/locate/cemconcompinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:28:07Zoai:repositorium.sdum.uminho.pt:1822/5964Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:22:51.477633Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Near surface mounted CFRP laminates for shear strengthening of concrete beams
title Near surface mounted CFRP laminates for shear strengthening of concrete beams
spellingShingle Near surface mounted CFRP laminates for shear strengthening of concrete beams
Barros, Joaquim A. O.
Carbon fiber reinforced Polymers
Concrete
Steel stirrups
Shear strengthening
Shear failure
Near surface mounted (NSM)
Science & Technology
title_short Near surface mounted CFRP laminates for shear strengthening of concrete beams
title_full Near surface mounted CFRP laminates for shear strengthening of concrete beams
title_fullStr Near surface mounted CFRP laminates for shear strengthening of concrete beams
title_full_unstemmed Near surface mounted CFRP laminates for shear strengthening of concrete beams
title_sort Near surface mounted CFRP laminates for shear strengthening of concrete beams
author Barros, Joaquim A. O.
author_facet Barros, Joaquim A. O.
Dias, Salvador J. E.
author_role author
author2 Dias, Salvador J. E.
author2_role author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Barros, Joaquim A. O.
Dias, Salvador J. E.
dc.subject.por.fl_str_mv Carbon fiber reinforced Polymers
Concrete
Steel stirrups
Shear strengthening
Shear failure
Near surface mounted (NSM)
Science & Technology
topic Carbon fiber reinforced Polymers
Concrete
Steel stirrups
Shear strengthening
Shear failure
Near surface mounted (NSM)
Science & Technology
description The authors wish to acknowledge the supports provided by the S&P, BeTTor MBT Portugal, Secil (Unibetão), and the colaboration of Cemacom.
publishDate 2006
dc.date.none.fl_str_mv 2006-03
2006-03-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/5964
url http://hdl.handle.net/1822/5964
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Journal cement and concrete composites". ISSN 0958-9465. 28:3 (Mar. 2006) 276-292.
0958-9465
10.1016/j.cemconcomp.2005.11.003
www.elsevier.com/locate/cemconcomp
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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