Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/38193 |
Resumo: | Externally Bonded Reinforcement (EBR) technique has been widely used for flexural strengthening of concrete structures by using carbon fiber-reinforced polymers (CFRP). EBR technique offers several structural advantages when the CFRP material is prestressed. This paper presents an experimental and numerical study on reinforced (RC) slabs strengthened in flexure with prestressed CFRP strips as a structural strengthening system. The strips are applied as an externally bonded reinforcement (EBR) and anchored with either a mechanical or a gradient anchorage. The former foresees metallic anchorage plates fixed to the concrete substrate, while the latter is based on an accelerated epoxy resin curing followed by a segment-wise prestress force decrease at the strip ends. Both anchorage systems, in combination with different CFRP strip geometries, were subjected to static loading tests. It could be demonstrated that the composite strip’s performance is better exploited when prestressing is used, with slightly higher overall load carrying capacities for mechanical anchorages than for the gradient anchorage. The performed investigations by means of a cross-section analysis supported the experimental observation that in case a mechanical anchorage is used, progressive strip debonding changes the fully bonded configuration to an unbonded end-anchored system. The inclusion of defined debonding criteria for both the anchorage zones and free length between the anchorage regions allowed to precisely capture the ultimate loading forces. |
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Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systemsRC plate strengtheningCFRP stripsPrestressingMechanical anchorageGradient anchorageCross-section analysisStatic loading testsNumerical simulationsEngenharia e Tecnologia::Engenharia CivilScience & TechnologyExternally Bonded Reinforcement (EBR) technique has been widely used for flexural strengthening of concrete structures by using carbon fiber-reinforced polymers (CFRP). EBR technique offers several structural advantages when the CFRP material is prestressed. This paper presents an experimental and numerical study on reinforced (RC) slabs strengthened in flexure with prestressed CFRP strips as a structural strengthening system. The strips are applied as an externally bonded reinforcement (EBR) and anchored with either a mechanical or a gradient anchorage. The former foresees metallic anchorage plates fixed to the concrete substrate, while the latter is based on an accelerated epoxy resin curing followed by a segment-wise prestress force decrease at the strip ends. Both anchorage systems, in combination with different CFRP strip geometries, were subjected to static loading tests. It could be demonstrated that the composite strip’s performance is better exploited when prestressing is used, with slightly higher overall load carrying capacities for mechanical anchorages than for the gradient anchorage. The performed investigations by means of a cross-section analysis supported the experimental observation that in case a mechanical anchorage is used, progressive strip debonding changes the fully bonded configuration to an unbonded end-anchored system. The inclusion of defined debonding criteria for both the anchorage zones and free length between the anchorage regions allowed to precisely capture the ultimate loading forces.This work is supported by FEDER funds through the Operational Program for Competitiveness Factors-COMPETE and National Funds through FCT-Portuguese Foundation for Science and Technology under the project FRPreDur-PTDC/ECM-EST/2424/2012. Additionally, the authors would like to thank all the companies that have been involved supporting and contributing for the development of this study, mainly: S&P Clever Reinforcement Iberica Lda, S&P Clever Reinforcement Company (Switzerland), Tecnipor-Gomes & Taveira Lda., Vialam-Industrias Metalurgicas e Metalomecanicas, Lda., Hilti Portugal-Produtos e Servicos, Lda. The fourth author wishes also to acknowledge the grant SFRH/BD/98309/2013 provided by FCT. This paper is dedicated to Tiago Teixeira (1988-2015), former doctoral student at the ISISE R&D Research Centre at the University of Minho.MDPIUniversidade do MinhoSena-Cruz, JoséMichels, JulienHarmanci, Yunus EmreCorreia, Luís Luciano Gouveia2015-102015-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/38193engSena-Cruz, J., Michels, J., Harmanci, Y. E., & Correia, L. (2015). Flexural Strengthening of RC Slabs with Prestressed CFRP Strips Using Different Anchorage Systems. Polymers, 7(10), 2100-21182073-436010.3390/polym7101502http://www.mdpi.com/2073-4360/7/10/1502info: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:RCAAP2023-07-21T12:08:09Zoai:repositorium.sdum.uminho.pt:1822/38193Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:59:20.669903Repositório 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 |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
title |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
spellingShingle |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems Sena-Cruz, José RC plate strengthening CFRP strips Prestressing Mechanical anchorage Gradient anchorage Cross-section analysis Static loading tests Numerical simulations Engenharia e Tecnologia::Engenharia Civil Science & Technology |
title_short |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
title_full |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
title_fullStr |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
title_full_unstemmed |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
title_sort |
Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems |
author |
Sena-Cruz, José |
author_facet |
Sena-Cruz, José Michels, Julien Harmanci, Yunus Emre Correia, Luís Luciano Gouveia |
author_role |
author |
author2 |
Michels, Julien Harmanci, Yunus Emre Correia, Luís Luciano Gouveia |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Sena-Cruz, José Michels, Julien Harmanci, Yunus Emre Correia, Luís Luciano Gouveia |
dc.subject.por.fl_str_mv |
RC plate strengthening CFRP strips Prestressing Mechanical anchorage Gradient anchorage Cross-section analysis Static loading tests Numerical simulations Engenharia e Tecnologia::Engenharia Civil Science & Technology |
topic |
RC plate strengthening CFRP strips Prestressing Mechanical anchorage Gradient anchorage Cross-section analysis Static loading tests Numerical simulations Engenharia e Tecnologia::Engenharia Civil Science & Technology |
description |
Externally Bonded Reinforcement (EBR) technique has been widely used for flexural strengthening of concrete structures by using carbon fiber-reinforced polymers (CFRP). EBR technique offers several structural advantages when the CFRP material is prestressed. This paper presents an experimental and numerical study on reinforced (RC) slabs strengthened in flexure with prestressed CFRP strips as a structural strengthening system. The strips are applied as an externally bonded reinforcement (EBR) and anchored with either a mechanical or a gradient anchorage. The former foresees metallic anchorage plates fixed to the concrete substrate, while the latter is based on an accelerated epoxy resin curing followed by a segment-wise prestress force decrease at the strip ends. Both anchorage systems, in combination with different CFRP strip geometries, were subjected to static loading tests. It could be demonstrated that the composite strip’s performance is better exploited when prestressing is used, with slightly higher overall load carrying capacities for mechanical anchorages than for the gradient anchorage. The performed investigations by means of a cross-section analysis supported the experimental observation that in case a mechanical anchorage is used, progressive strip debonding changes the fully bonded configuration to an unbonded end-anchored system. The inclusion of defined debonding criteria for both the anchorage zones and free length between the anchorage regions allowed to precisely capture the ultimate loading forces. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-10 2015-10-01T00:00:00Z |
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/1822/38193 |
url |
http://hdl.handle.net/1822/38193 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Sena-Cruz, J., Michels, J., Harmanci, Y. E., & Correia, L. (2015). Flexural Strengthening of RC Slabs with Prestressed CFRP Strips Using Different Anchorage Systems. Polymers, 7(10), 2100-2118 2073-4360 10.3390/polym7101502 http://www.mdpi.com/2073-4360/7/10/1502 |
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 |
MDPI |
publisher.none.fl_str_mv |
MDPI |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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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 |
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1799132385003962368 |