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https://hdl.handle.net/1822/9245
Título: | Efficacy of CFRP-based techniques for the flexural and shear strengthening of concrete beams |
Autor(es): | Barros, Joaquim A. O. Dias, Salvador J. E. Lima, João L. T. |
Palavras-chave: | CFRP Flexural strengthening Shear strengthening Reinforced concrete beams EBR NSM |
Data: | Mar-2007 |
Editora: | Elsevier 1 |
Revista: | Cement and Concrete Composites |
Citação: | “Cement and Concrete Composites”. ISSN 0958-9465. 29:3 (2007) 203–217. |
Resumo(s): | Near surface mounted (NSM) and externally bonded reinforcement (EBR) strengthening techniques are based on the use of carbon fiber reinforced polymer (CFRP) materials and have been used for the structural rehabilitation of concrete structures. In the present work, the efficacies of the NSM and EBR techniques for the flexural and shear strengthening of reinforced concrete beams are compared carrying out two experimental groups of tests. For the flexural strengthening, the efficacy of applying CFRP laminates according to NSM is compared to those resulting from applying CFRP laminates and wet lay-up CFRP sheets according to EBR technique. The influences of the equivalent reinforcement ratio (steel and laminates) and spacing of the laminates on the efficiency of the NSM technique for the flexural strengthening is also investigated. A numerical strategy is implemented to analyze the applicability of the FRP effective strain concept, proposed by ACI and fib in the design of FRP systems for the flexural strengthening. To assess the efficacy of the NSM technique for the shear strengthening of concrete beams, four beam series of distinct depth and longitudinal tensile steel reinforcement ratio are tested. Each series is composed of one beam without any shear reinforcement and one beam using the following shear reinforcing systems: conventional steel stirrups; strips of wet lay-up CFRP sheet of U configuration applied according to EBR technique; and laminates of CFRP embedded into vertical or inclined (45 ) pre-cut slits on the concrete cover of the beam lateral faces, according to the NSM technique. Using the obtained experimental results, the performance of the analytical formulations proposed by ACI, fib and Italian guidelines is appraised. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/9245 |
DOI: | 10.1016/j.cemconcomp.2006.09.001 |
ISSN: | 0958-9465 |
Versão da editora: | www.sciencedirect.com |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CEC-EST - Artigos em Revistas Internacionais ISISE - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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RI(SCI)_BarrosEtAl_Cement&ConcreteComposites_2007.pdf Acesso restrito! | artigo | 1,39 MB | Adobe PDF | Ver/Abrir |