Evaluation of Bending Strength of RC Beams Strengthened with FRP Sheets
Publication: Journal of Composites for Construction
Volume 10, Issue 4
Abstract
This paper deals with reinforced concrete beams strengthened by means of externally bonded fiber-reinforced polymer (FRP) sheets. The scope of the work is to discuss and compare an exact and an approximate approach to the computation of the flexural load-carrying capacity of the strengthened beam. The two approaches differ from one another in the way they take into account the extent of the load already acting throughout strengthening operations. To achieve this goal a numerical model is presented and validated by comparing its output with that of 46 experimental tests taken from the literature. The numerical model is then adopted to perform a numerical parametric analysis of a wide range of practical applications, excluding all cases of FRP delamination, and useful conclusions are drawn.
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References
American Concrete Institute (ACI. (2001). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” 440.2R-02, Farmington Hills, Mich.
An, W., Saadatmanesh, H., and Ehsani, M. R. (1991). “Beams strengthened with FRP plates. II: Analysis and parametric study.” J. Struct. Eng., 117(11), 3434–3455.
Arduini, M., and Nanni, A. (1997). “Behavior of precracked RC beams strengthened with carbon FRP sheets.” J. Compos. Constr., 1(2), 63–70.
CEB-FIP. (1982). “CEB-FIP manual on bending and compression—Design of sections under axial action effects at the ultimate limit state.” CEB Bulletin d’Information No. 141, Lausanne, Switzerland.
CEB-FIP. (1991). “CEB-FIP model code 1990.” CEB Bulletin d’Information No. 203-204-205, Lausanne, Switzerland.
European Committee for Standardization (CEN. (1991). “Eurocode 2: Design of concrete structures. 1: General rule and rules for buildings.” ENV 1992-1-1, Brussels.
European Committee for Standardization (CEN. (1995). “Steel for the reinforcement of concrete. Weldable ribbed reinforcing steel B500. Technical delivery conditions for bars, coils and welded fabric.” ENV 10080, Brussels.
Chajes, M. J., Thomson, T. A., Januszka, T. F., and Fin, W. (1994). “Flexural strengthening of concrete beams using externally bonded composite materials.” Constr. Build. Mater., 8(3), 191–201.
David, E., Djelal, C., and Buyle-Bodin, F. (1998), “Repair and strengthening of reinforced concrete beams using composite materials.” 2nd Int. PhD Symp. in Civil Engineering, G. L. Balázs, ed., Technical University of Budapest, Budapest, Hungary (see also http://www.vbt.bme.hu/phdsymp/2ndphd/toc.htm).
Di Tommaso, A., Neubauer, U., Pantuso, A., and Rostasy, F. S. (2001). “Behavior of adhesively bonded concrete-CFRP joints at low and high temperatures.” Mech. Compos. Mater., 37(4), 327–338.
Duthinh, D., and Starnes, M. (2001). “Strength and ductility of concrete beams reinforced with carbon fiber-reinforced polymer plates and steel.” J. Compos. Constr., 8(1), 59–69.
Fdération Internationale du Béton (FIB. (2001). Externally bonded FRP reinforcement for RC structures, Lausanne, Switzerland.
Grace, N. F., Abdel-Sayed, G., and Ragheb, W. F. (2002). “Strengthening of concrete beams using innovative ductile fiber-reinforced polymer fabric.” ACI Struct. J., 99(5), 692–700.
Italian Ministry of Public Works. (1976). “Norme tecniche per la esecuzione delle opere in cemento armato normale e precompresso e per le strutture metalliche.” Decreto Ministeriale 16/6/76, Istituto Poligrafico dello Stato, Rome.
Kurtz, S., and Balaguru, P. (2001). “Comparison of inorganic and organic matrices for strengthening of RC beams with carbon sheets.” J. Struct. Eng., 127(1), 35–42.
Maalej, M., and Bian, Y. (2001). “Interfacial shear stress concentration in FRP-strengthened beams.” Compos. Struct., 54(4), 417–426.
Meier, U. (1987). “Bridge repair with high performance composite materials,” Adv. Solid State Phys., 4, 125–128 (in German).
Meier, U., and Winistorfer, A. (1995). “Retrofitting of structures trough external bonding of CFRP sheets.” Proc., 2nd Int. RILEM Symp. FRPRCS-2, E&FN Spon, London.
Nakamura, M., Sakai, H., Yagi, K., and Tanaka, T. (1996). “Experimental studies on the flexural reinforcing effect of carbon fiber sheets bonded to reinforced concrete beam.” Proc., 1st Int. Conf. on Composites in Infrastructures ICCI 96, 760–773.
Nguyen, D. M., Chan, T. K., and Cheong, H. K. (2001). “Brittle failure and bond development length of CFRP-concrete beams,” J. Compos. Constr., 5(1), 12–17.
Okeil, A. M., El-Tawil, S., and Shahawy, M. (2001). “Short term tensile strength of carbon fiber-reinforced polymer laminates for flexural strengthening of concrete girders.” ACI Struct. J., 98(4), 470–478.
Pisani, M. A. (1996). “A numerical method to analyse compact cross sections.” Comput. Struct., 59(6), 1063–1072.
Rahimi, H., and Hutchinson, A. (2001). “Concrete beams strengthened with externally bonded FRP plates.” J. Compos. Constr., 5(1), 44–56.
Ritchie, P. A., Thomas, D. A., Lu, L. W., and Connelly, G. M. (1991). “External reinforcement of concrete beams using fiber reinforced plastics.” ACI Struct. J., 88(4), 490–500.
Rotter, J. M. (1985). “Rapid exact inelastic biaxial bending analysis.” J. Struct. Eng., 111(12), 2659–2674.
Saadatmanesh, H., and Ehsani, M. R. (1991). “RC beams strengthening with GFRP plates. I: Experimental study.” J. Struct. Eng., 117(11), 3417–3433.
Shahawy, M., Chaallal, O., Beitelman, T. E., and El-Saad, A. (2001). “Flexural strengthening with carbon fiber-reinforced polymer composites of preloaded full-scale girders.” ACI Struct. J., 98(5), 735–742.
Sharif, A., Al-Sulaimani, G. J., Basunbul, I. A., Baluch, M. H., and Ghaleb, B. N. (1994). “Strengthening of initially loaded reinforced concrete beams using FRP plates.” ACI Struct. J., 91(2), 160–168.
Swamy, R. N., Jones, R., and Bloxham, J. W. (1987). “Structural behaviour of reinforced concrete beams strengthened by epoxy-bonded steel plates.” Struct. Eng., 65A(2), 59–68.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 4 • August 2006
Pages: 313 - 320
Copyright
© 2006 ASCE.
History
Received: Feb 8, 2005
Accepted: Nov 16, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
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