Structural strengthening with prestressed CFRP strips with gradient anchorage

Detalhes bibliográficos
Autor(a) principal: Michels, Julien
Data de Publicação: 2013
Outros Autores: Sena-Cruz, José, Czaderski, Christoph, Motavalli, Masoud
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/25521
Resumo: Manuscript
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spelling Structural strengthening with prestressed CFRP strips with gradient anchorageStructural retrofittingPrestressed CFRP stripsEpoxy adhesiveAccelerated curingInnovative anchorage techniqueGradient anchorageRehabilitationConcrete beamsFiber reinforced polymerAdhesivesCuringAnchorageScience & TechnologyManuscriptThis paper presents the principle and the application of an innovative anchorage technique for prestressed carbon fiber–reinforced polymer (CFRP) strips in structural strengthening. Additionally, large-scale static loading tests of retrofitted concrete beams are shown. The gradient anchorage, based on the adhesive’s ability to undergo accelerated curing at high temperatures, consists of a purely concrete-adhesive strip connection without any mechanical devices, such as bolts or plates. In a first step, this study summarizes anchorage techniques presented in the literature and introduces the basic principles of the new method as well as the necessary components. In a second step, an application on a full-scale RC beam is explained in detail. A commercially-available CFRP strip is prestressed up to 0.6% prestrain and subsequently anchored by sequential epoxy-curing and force-releasing steps at both strip ends. Furthermore, uniaxial tensile tests on the epoxy adhesive and the CFRP strip are used for material characterization and to demonstrate the reinforcing materials’ integrity after the heating process. It appeared that prestress losses during the anchoring phase are negligible. The method allows much faster installation than conventional mechanical techniques and increases durability because no permanent steel elements are necessary. The material tests indicate no damage in the reinforcing CFRP strip as well as a sufficiently fast strength development of the adhesive after accelerated curing. Static loading tests on strengthened large-scale RC beams are presented and show the efficiency of a prestressed CFRP strip with gradient anchorage as a retrofitting technique. Finally, first long-term measurements over 13 years on a prestressed strip bonded to a concrete plate revealed small prestrain losses.The authors want to thank the Swiss innovation promotion agency (CTI project No. 10493.2 PFIW-IW) as well as the industrial partner S&P Clever Reinforcement from Switzerland for their financial support. Furthermore, the staff of the Structural Engineering Testing Laboratory at Empa as well as from University of Minho is kindly thanked for their contributions to the experimental investigations. Particular acknowledgements are expressed to Milos Dimic for the CAD Inventor drawings as well as Professor Fernando Castro from the Department of Mechanical Engineering of the University of Minho for the SEM images. The second author would like to thank the Fundaao para a Ciencia e a Tecnologia (Foundation for the Science and Technology/Portugal), grant SFRH/BSAB/1220/2011 for providing financial support in the context of his sabbatical year.American Society of Civil Engineers (ASCE)Universidade do MinhoMichels, JulienSena-Cruz, JoséCzaderski, ChristophMotavalli, Masoud20132013-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/25521eng1090-026810.1061/(ASCE)CC.1943-5614.0000372info: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:RCAAP2023-07-21T12:30:12Zoai:repositorium.sdum.uminho.pt:1822/25521Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:25:19.596584Repositório 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 Structural strengthening with prestressed CFRP strips with gradient anchorage
title Structural strengthening with prestressed CFRP strips with gradient anchorage
spellingShingle Structural strengthening with prestressed CFRP strips with gradient anchorage
Michels, Julien
Structural retrofitting
Prestressed CFRP strips
Epoxy adhesive
Accelerated curing
Innovative anchorage technique
Gradient anchorage
Rehabilitation
Concrete beams
Fiber reinforced polymer
Adhesives
Curing
Anchorage
Science & Technology
title_short Structural strengthening with prestressed CFRP strips with gradient anchorage
title_full Structural strengthening with prestressed CFRP strips with gradient anchorage
title_fullStr Structural strengthening with prestressed CFRP strips with gradient anchorage
title_full_unstemmed Structural strengthening with prestressed CFRP strips with gradient anchorage
title_sort Structural strengthening with prestressed CFRP strips with gradient anchorage
author Michels, Julien
author_facet Michels, Julien
Sena-Cruz, José
Czaderski, Christoph
Motavalli, Masoud
author_role author
author2 Sena-Cruz, José
Czaderski, Christoph
Motavalli, Masoud
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Michels, Julien
Sena-Cruz, José
Czaderski, Christoph
Motavalli, Masoud
dc.subject.por.fl_str_mv Structural retrofitting
Prestressed CFRP strips
Epoxy adhesive
Accelerated curing
Innovative anchorage technique
Gradient anchorage
Rehabilitation
Concrete beams
Fiber reinforced polymer
Adhesives
Curing
Anchorage
Science & Technology
topic Structural retrofitting
Prestressed CFRP strips
Epoxy adhesive
Accelerated curing
Innovative anchorage technique
Gradient anchorage
Rehabilitation
Concrete beams
Fiber reinforced polymer
Adhesives
Curing
Anchorage
Science & Technology
description Manuscript
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01T00:00:00Z
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/1822/25521
url http://hdl.handle.net/1822/25521
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1090-0268
10.1061/(ASCE)CC.1943-5614.0000372
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 American Society of Civil Engineers (ASCE)
publisher.none.fl_str_mv American Society of Civil Engineers (ASCE)
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
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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