Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bond and flexural behavior of concrete elements strengthened with NSM CFRP laminate strips under fatigue loading
This paper presents the results of an experimental research on bond and flexural behavior of concrete elements strengthened with carbon fiber reinforced polymer (CFRP) laminate strips under fatigue loading conditions, applied according to the near-surface mounted (NSM) strengthening technique. Long-term performance of the NSM system could be compromised by fatigue loading, which may result in deterioration and weakening of individual components (steel, FRP, concrete), or loss of bond performance and composite action. Hence, an experimental program composed of direct pullout tests and slab specimens was carried out to evaluate the influence of the stress level and amplitude of cycles imposed to the specimens. In bond fatigue tests, debonding failure occurred for a maximum stress level corresponding to 60% of the ultimate bond load obtained from monotonic loading. The fatigue loading imposed on the slabs did not yield to its failure. Consequently, the load carrying capacity obtained from post-fatigue tests of strengthened slabs was not significantly affected by this action. ; 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 CutInDur PTDC/ECM/112396/2009. The authors also 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., Casais - Engenharia & Construcao S.A., Artecanter - Industria de Transformacao de Granitos, Lda., Tecnipor - Gomes & Taveira Lda., Vialam - Industrias Metalurgicas e Metalomecanicas, Lda., Hilti Portugal-Produtos e Servicos, Lda., Novo Modelo Europa, S.A., Sika Portugal - Produtos Construcao e Industria, and S.A., Cachapuz - Equipamentos para Pesagem, Lda. The first and second authors wishes also to acknowledge the Grants SFRH/BD/80338/2011 and SFRH/BD/89768/2012, respectively, provided by FCT.
Bond and flexural behavior of concrete elements strengthened with NSM CFRP laminate strips under fatigue loading
This paper presents the results of an experimental research on bond and flexural behavior of concrete elements strengthened with carbon fiber reinforced polymer (CFRP) laminate strips under fatigue loading conditions, applied according to the near-surface mounted (NSM) strengthening technique. Long-term performance of the NSM system could be compromised by fatigue loading, which may result in deterioration and weakening of individual components (steel, FRP, concrete), or loss of bond performance and composite action. Hence, an experimental program composed of direct pullout tests and slab specimens was carried out to evaluate the influence of the stress level and amplitude of cycles imposed to the specimens. In bond fatigue tests, debonding failure occurred for a maximum stress level corresponding to 60% of the ultimate bond load obtained from monotonic loading. The fatigue loading imposed on the slabs did not yield to its failure. Consequently, the load carrying capacity obtained from post-fatigue tests of strengthened slabs was not significantly affected by this action. ; 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 CutInDur PTDC/ECM/112396/2009. The authors also 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., Casais - Engenharia & Construcao S.A., Artecanter - Industria de Transformacao de Granitos, Lda., Tecnipor - Gomes & Taveira Lda., Vialam - Industrias Metalurgicas e Metalomecanicas, Lda., Hilti Portugal-Produtos e Servicos, Lda., Novo Modelo Europa, S.A., Sika Portugal - Produtos Construcao e Industria, and S.A., Cachapuz - Equipamentos para Pesagem, Lda. The first and second authors wishes also to acknowledge the Grants SFRH/BD/80338/2011 and SFRH/BD/89768/2012, respectively, provided by FCT.
Bond and flexural behavior of concrete elements strengthened with NSM CFRP laminate strips under fatigue loading
Fernandes, Pedro Miguel Gomes (Autor:in) / Silva, Patrícia (Autor:in) / Sena-Cruz, José (Autor:in)
01.01.2015
doi:10.1016/j.engstruct.2014.11.039
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC:
690
Bond behaviour of concrete elements strengthened with NSM CFRP laminate strips under wet-dry cycles
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Flexural Behavior of Concrete Beams Strengthened with Near-Surface-Mounted CFRP Strips
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