Analysis of FRP Shear Strengthening Solutions for Reinforced Concrete Beams Considering Debonding Failure
Publication: Journal of Composites for Construction
Volume 20, Issue 5
Abstract
In this paper, a fiber beam model previously developed by the authors for the nonlinear analysis of strengthened elements, including the effects of shear, is used to predict the response of reinforced concrete (RC) beams strengthened in shear with fiber reinforced polymers (FRP) sheets. In the previous version of the model, debonding failure of FRP was not included; hence, its application was limited to the simulation of wrapped configurations. The model is now extended to account for debonding failure in order to allow for its application to beams strengthened with U-shaped and side-bonded configurations. Existing experimental tests on RC beams strengthened in shear by FRP sheets in both wrapped and U-shaped configurations were numerically simulated. The model reproduces, with reasonable accuracy, the experimental failure loads, the load-deflection behavior, and the strains in FRP and stirrups with increasing load. The advantages of this proposal are related with the simplicity and straightforwardness of the beam models to be applied in practical engineering problems.
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Acknowledgments
The present research has been carried out with the support of the project “Performance-based-design of partially prestressed concrete structures. Proposal of new design methodology, experimental verification and design criteria” (BIA2012-36848) co-financed by the Spanish Ministry of Economics and Competitiveness and the European Funds for Regional Development (FEDER). The Postdoctoral Fellowship conceded by the Government of Catalonia (ref. 2013 PDJ 00022) to the first author is also gratefully acknowledged. The authors acknowledge the support of Albert Alzate, Angel Arteaga, Daniel Cisneros, and Ana de Diego from the Instituto de Ciencias de la Construcción Eduardo Torroja of Spain, on the provided data related to their experimental program.
References
ACI (American Concrete Institute). (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-08, Farmington Hills, MI.
Alzate, A. (2012). “Análisis de los modelos de comportamiento de vigas de hormigón armado reforzadas a cortante con polímeros armados con fibras (FRP).” Ph.D. thesis, Universidad Politécnica de Madrid, Madrid, Spain.
CEN (Comité Europeen de Normalisation). (2004). “Eurocode 2: Design of concrete structures—Part 1.1: General rules and rules for buildings.” EN 1992-1-1:2004, Brussels, Belgium.
Cervenka, V. (1985). “Constitutive model for cracked reinforced concrete.” ACI Struct. J., 82(6), 877–882.
Chen, J. F., and Teng, J. G. (2003). “Shear capacity of FRP-strengthened RC beams: FRP debonding.” Constr. Build. Mater., 17(1), 27–41.
CNR (National Research Council). (2004). “Guide for the design and construction of externally bonded FRP systems for strengthening existing structures.” CNR-DT200/2004, Rome.
Colajanni, P., La Mendola, L., and Recupero, A. (2005). “Shear-flexure interaction of RC elements strengthened with FRP sheets.” Proc., 1st Int. Conf. on Concrete Repair, Rehabilitation and Retrofitting, M. G. Alexander, H.-D. Beushausen, F. Dehn, and P. Moyo, eds., CRC Press, Boca Raton, FL, 460–462.
Concrete Society. (2012). “Design guidance for strengthening concrete structures using fibre composite materials.” London.
Ferreira, D. (2013). “A model for the nonlinear, time-dependent and strengthening analysis of shear critical frame concrete structures.” Ph.D. thesis, Universitat Politècnica de Cataluña, Barcelona, Spain.
Ferreira, D., Bairán, J., Marí, A. (2013a). “Numerical simulation of shear-strengthened RC beams.” Eng. Struct., 46, 359–374.
Ferreira, D., Bairán, J., and Marí, A. (2014b). “Efficient 1D model for blind assessment of existing bridges: Simulation of a full scale loading test and comparison with higher order continuum models.” Struct. Infrastruct. Eng., 11(10), 1383–1397.
Ferreira, D., Bairán, J., Marí, A., and Faria, R. (2014a). “Nonlinear analysis of RC beams using a hybrid shear-flexural fibre beam model.” Eng. Comput., 31(7), 1444–1483.
Ferreira, D., Oller, E., Marí, A., and Bairán, J. (2013b). “Numerical analysis of shear critical RC beams strengthened in shear with FRP laminates.” J. Comp. Constr., 04013016-1-11.
FIB (Federation Internationale du Beton). (2001). “Externally bonded FRP reinforcement for RC structures. Technical report on the design and use of externally bonded fibre reinforced polymer reinforcement (FRP EBR) for reinforced concrete structures.”, Laussanne, Switzerland.
German Committee for Reinforced Concrete. (2013). “DAfStb Heft 595 Erläuterungen und Beispiele zur DAfStb-Richtlinie Verstärken von Betonbauteilen mit geklebter Bewehrung.” Berlin.
Khalifa, A., and Nanni, A. (2000). “Improving the shear capacity of existing RC T-section beams using CFRP composites.” Cem. Concr. Compos., 22(3), 165–174.
Khalifa, A., and Nanni, A. (2002). “Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites.” Constr. Build. Mater., 16(3), 135–146.
Kotynia, R. (2011). “Shear strengthening of RC beams with polymer composites.” Lodz Univ. of Technology, Lodz, Poland, 310.
Kupfer, H., Hilsdorf, H. K., and Rusch, H. (1969). “Behavior of concrete under biaxial stresses.” ACI J., 66(8), 656–666.
Matthys, S. (2000). “Structural behaviour and design of concrete members strengthened with externally bonded FRP reinforcement.” Ph.D. thesis, Universiteit Gent, Belgium.
Mofidi, A., and Chaallal, O. (2011). “Shear strengthening of RC beams with externally bonded FRP composites. Effect of strip-witdh to-strip-spacing ratio.” J. Comp. Constr., 732–742.
Mofidi, A., Chaallal, O., Benmokrane, B., and Neale, K. W. (2013). “End-anchorage systems to prevent EB FRP sheets debonding in shear strengthened RC beams.” Proc., 11th Int. Symp. on Fiber Reinforced Polymers for Reinforced Concrete Structures FRPRCS-11, Univ. of Minho, Guimaraes, Portugal, 199–200.
Monti, G., and Liotta, M. A. (2007). “Test and design equations for FRP-strengthening in shear.” Constr. Build. Mater., 21(4), 799–809.
Oller, E. (2005). “Peeling failure in beams externally strengthened by plate bonding. A design proposal.” Ph.D. thesis, Universidad Politécnica de Cataluña, Barcelona, Spain.
Oller, E., Cobo, D., and Marí, A. (2009). “Interface behavior in FRP-strengthened beams subjected to transverse loads. Maximum transferred force.” J. Comp. Constr., 35–44.
Pellegrino, C., and Modena, C. (2006). “Fiber-reinforced polymer shear strengthening of reinforced concrete beams: Experimental study and analytical modeling.” ACI Struct. J., 103(5), 720–728.
Pellegrino, C., and Vasic, M. (2013). “Assessment of design procedures for the use of externally bonded FRP composites in shear strengthening of reinforced concrete beams.” Compos.: Part B, 45(1), 727–741.
Sas, G., Täljsten, B., Barros, J., Lima, J., and Carolin, A. (2009). “Are available models reliable for predicting the FRP contribution to the shear resistance of RC beams?” J. Compos. Constr., 514–534.
Spoelstra, M. R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr., 143–150.
Vecchio, F. J., and Collins, M. P. (1986). “The modified compression-field theory for reinforced concrete elements subjected to shear.” ACI J., 83(2), 1357–1417.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 5 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 14, 2015
Accepted: Dec 1, 2015
Published online: Feb 8, 2016
Discussion open until: Jul 8, 2016
Published in print: Oct 1, 2016
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