Estruturas de concreto reforçadas com PRFC Parte I: análise dos modelos de flexão

Gamino, A. L.; Bittencourt, T. N.; Sousa, J. L. A. De Oliveira e

doi:10.1590/S1983-41952009000400003

Resumos

Este trabalho, apresentado em duas partes, trata da avaliação dos modelos de projeto de estruturas de concreto armado reforçadas com Polímeros Reforçados com Fibras de Carbono (PRFC). Nesta primeira parte são avaliados modelos de flexão originados das recomendações ACI-440 e fib-14, assim como outros modelos mais recentes, disponíveis na literatura. Esses critérios foram aplicados a um total de vinte e cinco vigas reforçadas à flexão, ensaiadas pelos autores, das quais dezesseis com seção retangular e nove com seção "T". Foram aplicados diferentes tipos de compósitos de fibras de carbono (tecidos e laminados), de diferentes fabricantes, encontrados no mercado brasileiro. Os resultados obtidos mostram uma boa proximidade entre as cargas de ruptura calculadas de acordo com as recomendações ACI-440 para reforços à flexão e os valores observados nos ensaios.

polímeros reforçados com fibras de carbono; reforço à flexão; ensaios experimentais; modelos analíticos

This work, presented in two parts, deals with the evaluation of design models for reinforced concrete structures strengthened with Carbon Fiber Reinforced Polymers (CFRP). In this first part, flexural models from ACI 440 and fib-14 guidelines, and recent models available in the literature, are evaluated. These criteria were applied to a total of twenty five beams strengthened in flexure with CFRP composites and tested by the authors: sixteen with rectangular cross section and nine with "T" cross section. Different types of carbon fiber composites (sheets and laminates) were applied, from different manufacturers available in the Brazilian market. Results show a good match among the rupture loads calculated using the ACI-440 guidelines for flexural strengthening and the corresponding values observed in the tests.

carbon fiber reinforced polymers; bending strengthening; experimental tests; analytical models

Estruturas de concreto reforçadas com PRFC Parte I: análise dos modelos de flexão

A. L. Gamino ^I ; T. N. Bittencourt ^II ; J. L. A. De oliveira e sousa ^III

^IPost-Doctoral Researcher, School of Civil Engineering, Architecture and Urbanism, University of Campinas, andre.gamino@gmail.com, Av. Albert Einstein 951, Campinas-SP, CEP 13083-852 ^IIAssociate Professor, Polytechnical School, University of São Paulo, tulio.bittencourt@poli.usp.br, Av. Prof. Almeida Prado, 271, São Paulo-SP, CEP 05508-900 ^IIIAssociate Professor, School of Civil Engineering, Architecture and Urbanism, University of Campinas, jls@fec.unicamp.br, Av. Albert Einstein 951, Campinas-SP, CEP 13083-852

RESUMO

Este trabalho, apresentado em duas partes, trata da avaliação dos modelos de projeto de estruturas de concreto armado reforçadas com Polímeros Reforçados com Fibras de Carbono (PRFC). Nesta primeira parte são avaliados modelos de flexão originados das recomendações ACI-440 e fib-14, assim como outros modelos mais recentes, disponíveis na literatura. Esses critérios foram aplicados a um total de vinte e cinco vigas reforçadas à flexão, ensaiadas pelos autores, das quais dezesseis com seção retangular e nove com seção "T". Foram aplicados diferentes tipos de compósitos de fibras de carbono (tecidos e laminados), de diferentes fabricantes, encontrados no mercado brasileiro. Os resultados obtidos mostram uma boa proximidade entre as cargas de ruptura calculadas de acordo com as recomendações ACI-440 para reforços à flexão e os valores observados nos ensaios.

Palavras-chave: polímeros reforçados com fibras de carbono, reforço à flexão, ensaios experimentais, modelos analíticos.

Texto completo disponivel apenas em PDF.

Full text avaliable only in PDF.

Received: 16 Jun 2009

Accepted: 18 Ago 2009

Available Online: 04 Dec 2009

[01] American Concrete Institute . State of the art report on fiber reinforced plastic reinforcement for concrete structures - ACI 440R-02, 2002.
[02] Federation International du Beton - "BULLETIN 14: Externally bonded FRP reinforcement for RC structures". Lausanne, October, 2001.
[03] Japan Society of Civil Engineers . Recommendations for upgrading of concrete structures with use of continuous fiber sheets, JSCE, Concrete Engineering Series, No. 23, 325p., October, 1997.
[04] GAMINO, A.L., Modelagem física e computacional de estruturas de concreto reforçadas com CFRP. Tese de Doutorado, Escola Politécnica da Universidade de São Paulo, 259p., 2007.
[05] GAMINO, A.L., BITTENCOURT, T.N., Reinforced Concrete Beams Strengthened with CFRP: Experimental, Analytical and Numerical Approaches. In: 8th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures - FRPRCS-8, Patras, pp.130-131, CD (10 pages), 2007.
[06] GAMINO, A.L., SOUSA, J.L.A.O., BITTENCOURT, T.N., Application of Carbon Fiber Reinforced Polymer in Strengthening to Shear R/C T Beams. In: 9th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures - FRPRCS-9, Sydney, CD (4 pages), 2009.
[07] GAMINO, A.L., BITTENCOURT, T.N., SOUSA, J.L.A.O., Finite element computational modeling of externally bonded CFRP composites flexural behavior in RC beams. Computers & Concrete, An International Journal, V. 6, No. 3, pp. 187-202, 2009.
[08] Oehlers , D.J., Reinforced concrete beams with plates glued to their soffits. Journal of Structural Engineering, ASCE, V. 118, No. 8, pp. 2023-2038, 1992.
[09] Jansze , W., Strengthening of RC members in bending by externally bonded steel plates. PhD Thesis, Delft University of Technology, 1997.
[10] Zhang, S., Raoof, M., Wood , L.A., Prediction of peeling failure of reinforced concrete beams with externally bonded steel plates. Structures and Buildings, V. 110, pp. 257-268, 1995.
[11] Raoof, M., Hassanen , M.A.H., Peeling failure of reinforced concrete beams with fibre reinforced plastic or steel plates glued to their soffits. Structures and Buildings, V. 140, pp. 291-305, 2000.
[12] Varastehpour , H., Hamelin , P. Strengthening of concrete beams using fiber-reinforced plastics. Materials and Structures, V. 30, pp. 160-166, 1997.
[13] Roberts , T.M., Approximate analysis of shear and normal stress concentrations in the adhesive layer of plated RC beams. Structural Engineer, V. 67, No. 12, pp. 229-233, 1989.
[14] Tumialan , G., Belarbi, A., Nanni, A., Reinforced concrete beams strengthened with CFRP composites: failure due to concrete cover delamination. Report CIES-99/01, University of Missoury-Rolla, 1999.
[15] Mirza , S., Hatzinikolas , M., Macgregor , J., Statistical descriptions of the strength of concrete. Journal of Structural Engineering, ASCE, V. 105, pp. 1021-1037, 1979.
[16] Smith , s.t., Teng , j.g., FRP-Strengthened RC beams II: assessment of debonding strength models. Engineering Structures, V. 24, No. 4, pp. 397-417, 2002.
[17] Saadatmanesh , H., Malek , A.M., Design guidelines for flexural strengthening of RC beams with FRP plates. Journal of Composites for Construction, ASCE, V. 2, No. 4, pp. 158-164, 1998.
[18] LYNX TECNOLOGIA ELETRÔNICA LTDA. ads 2000. Manual de usuário. São Paulo. LYNX, 2003.
[19] LYNX TECNOLOGIA ELETRÔNICA LTDA. AqDados 7.0 - Programa de aquisição de dados. Manual de usuário. São Paulo. LYNX, 2003.
[20] LYNX TECNOLOGIA ELETRÔNICA LTDA. AqDAnalysis 7.0 - Programa de tratamento de sinais. Manual de usuário. São Paulo. LYNX, 2005.
[21] American Society for Testing and Materials . Standart test method for tensile properties of polymer matrix composite materials. ASTM D3039, 1995.
[22] American Society for Testing and Materials , Standart test method for tensile properties of plastics. ASTM D638, 1996.

Datas de Publicação

Publicação nesta coleção
18 Set 2014
Data do Fascículo
Dez 2009

Histórico

Recebido
16 Jun 2009
Aceito
18 Ago 2009

This work is licensed under a Creative Commons Attribution 4.0 International License.

[1] [01] American Concrete Institute . State of the art report on fiber reinforced plastic reinforcement for concrete structures - ACI 440R-02, 2002.

[2] [02] Federation International du Beton - "BULLETIN 14: Externally bonded FRP reinforcement for RC structures". Lausanne, October, 2001.

[3] [03] Japan Society of Civil Engineers . Recommendations for upgrading of concrete structures with use of continuous fiber sheets, JSCE, Concrete Engineering Series, No. 23, 325p., October, 1997.

[4] [04] GAMINO, A.L., Modelagem física e computacional de estruturas de concreto reforçadas com CFRP. Tese de Doutorado, Escola Politécnica da Universidade de São Paulo, 259p., 2007.

[5] [05] GAMINO, A.L., BITTENCOURT, T.N., Reinforced Concrete Beams Strengthened with CFRP: Experimental, Analytical and Numerical Approaches. In: 8th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures - FRPRCS-8, Patras, pp.130-131, CD (10 pages), 2007.

[6] [06] GAMINO, A.L., SOUSA, J.L.A.O., BITTENCOURT, T.N., Application of Carbon Fiber Reinforced Polymer in Strengthening to Shear R/C T Beams. In: 9th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures - FRPRCS-9, Sydney, CD (4 pages), 2009.

[7] [07] GAMINO, A.L., BITTENCOURT, T.N., SOUSA, J.L.A.O., Finite element computational modeling of externally bonded CFRP composites flexural behavior in RC beams. Computers & Concrete, An International Journal, V. 6, No. 3, pp. 187-202, 2009.

[8] [08] Oehlers , D.J., Reinforced concrete beams with plates glued to their soffits. Journal of Structural Engineering, ASCE, V. 118, No. 8, pp. 2023-2038, 1992.

[9] [09] Jansze , W., Strengthening of RC members in bending by externally bonded steel plates. PhD Thesis, Delft University of Technology, 1997.

[10] [10] Zhang, S., Raoof, M., Wood , L.A., Prediction of peeling failure of reinforced concrete beams with externally bonded steel plates. Structures and Buildings, V. 110, pp. 257-268, 1995.

[11] [11] Raoof, M., Hassanen , M.A.H., Peeling failure of reinforced concrete beams with fibre reinforced plastic or steel plates glued to their soffits. Structures and Buildings, V. 140, pp. 291-305, 2000.

[12] [12] Varastehpour , H., Hamelin , P. Strengthening of concrete beams using fiber-reinforced plastics. Materials and Structures, V. 30, pp. 160-166, 1997.

[13] [13] Roberts , T.M., Approximate analysis of shear and normal stress concentrations in the adhesive layer of plated RC beams. Structural Engineer, V. 67, No. 12, pp. 229-233, 1989.

[14] [14] Tumialan , G., Belarbi, A., Nanni, A., Reinforced concrete beams strengthened with CFRP composites: failure due to concrete cover delamination. Report CIES-99/01, University of Missoury-Rolla, 1999.

[15] [15] Mirza , S., Hatzinikolas , M., Macgregor , J., Statistical descriptions of the strength of concrete. Journal of Structural Engineering, ASCE, V. 105, pp. 1021-1037, 1979.

[16] [16] Smith , s.t., Teng , j.g., FRP-Strengthened RC beams II: assessment of debonding strength models. Engineering Structures, V. 24, No. 4, pp. 397-417, 2002.

[17] [17] Saadatmanesh , H., Malek , A.M., Design guidelines for flexural strengthening of RC beams with FRP plates. Journal of Composites for Construction, ASCE, V. 2, No. 4, pp. 158-164, 1998.

[18] [18] LYNX TECNOLOGIA ELETRÔNICA LTDA. ads 2000. Manual de usuário. São Paulo. LYNX, 2003.

[19] [19] LYNX TECNOLOGIA ELETRÔNICA LTDA. AqDados 7.0 - Programa de aquisição de dados. Manual de usuário. São Paulo. LYNX, 2003.

[20] [20] LYNX TECNOLOGIA ELETRÔNICA LTDA. AqDAnalysis 7.0 - Programa de tratamento de sinais. Manual de usuário. São Paulo. LYNX, 2005.

[21] [21] American Society for Testing and Materials . Standart test method for tensile properties of polymer matrix composite materials. ASTM D3039, 1995.

[22] [22] American Society for Testing and Materials , Standart test method for tensile properties of plastics. ASTM D638, 1996.

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Estruturas de concreto reforçadas com PRFC Parte I: análise dos modelos de flexão

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