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Analytical Model to Predict the Shear Capacity of Reinforced Concrete Beams Externally Strengthened with CFRP Composites Conditions

Authors: Rajai Al-Rousan


This paper presents a proposed analytical model for predicting the shear strength of reinforced concrete beams strengthened with CFRP composites as external reinforcement. The proposed analytical model can predict the shear contribution of CFRP composites of RC beams with an acceptable coefficient of correlation with the tested results. Based on the comparison of the proposed model with the published well-known models (ACI model, Triantafillou model, and Colotti model), the ACI model had a wider range of 0.16 to 10.08 for the ratio between tested and predicted ultimate shears at failure. Also, an acceptable range of 0.27 to 2.78 for the ratio between tested and predicted ultimate shears by the Triantafillou model. Finally, the best prediction (the ratio between the tested and predicted ones) of the ultimate shear capacity is observed by using Colotti model with a range of 0.20 to 1.78. Thus, the contribution of the CFRP composites as external reinforcement can be predicted with high accuracy by using the proposed analytical model.

Keywords: Predicting, Reinforced Concrete, Beams, shear capacity, strengthened, externally, CFRP composites

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[1] ACI Committee 318. “Building Code Requirements for Reinforced Concrete (ACI 318-08) and Commentary (318R-08).” American Concrete Institute, Farmington Hills, M. I.: 443, 2008.
[2] Ritter, W., “Die bauweise hennebique,” Schweizerische Bauzei-tung, Vol. 33, No. 7, 1899, 59-61.
[3] Chajes, M. J., Januska, T. F., Mertz, D. R., Thomson, T. A., and Finch, W. W., Jr. “Shear Strengthening of Reinforced Concrete Beams Using Externally Applied Composites Fabrics”. ACI Structural Journal, Vol. 92, No. 3, 1995, 295-303.
[4] Swamy, R. N., Mukhopadhyaya, P., and Lynsdale, C. J. “Strengthening for Shear of RC Beams by External Plate Bonding”. The Structural Engineer, Vol. 77, No. 12, 1999, 19-30.
[5] Khalifa, A., and Nanni, A. “Behavior between Fiber-Reinforced Polymer Laminates and Concrete”. Cement and Concrete Composites, Vol. 22, No. 3, 2000, 165-174.
[6] Matthys, S. “Structural Behavior and Design of Concrete Members Strengthened with Externally Bonded FRP Reinforcement”. PhD Thesis, Department of Structural Engineering, Ghent University, Belgium, 2000
[7] Al-Rousan, Rajai Zuheir. “Experimental and Theoretical Behavior of Reinforced Concrete Beams and Columns Strengthened with CFRP.” Ph.D. Theses, Department of Civil and Materials Engineering, University of Illinois at Chicago (UIC), Chicago, Illinois, 2008.
[8] Lu, X. Z. J. G. Teng, L. P., and Ye, J. J. Jiang “Bond–slip models for FRP sheets/plates bonded to concrete”. Engineering Structures Journal, Vol. 27, No. 1, 2005, 920-937.
[9] ACI Committee 440. “Design and Construction of Externally Bonded FRP Systems for strengthening Concrete Structures” *ACI440.2R-02. American Concrete Institute, Farmington Hills, Mich.: 45 pp, 2002.
[10] Malek, A. M., and Saadatmanesh, H. “Ultimate Shear Capacity of Reinforced Concrete Beams Strengthened with Web-Bonded Fiber-Reinforced Plastic Plates”. ACI Structural Journal, Vol. 95, No. 4, 1998, 391-399.
[11] Triantafillou, T. C. “Shear Strengthening of Reinforced Concrete Beams Using Epoxy-Bonded FRP Composites”. ACI Structural Journal, Vol. 95, No. 2, 1998, 107-115.
[12] Colotti V, Spadea G, Swamy R. N. “Structural Model to Predict the Failure Behavior of Plated Reinforced Concrete Beams”. J. Compos. Constr., Vol. 8, No. 2, 2004, 104-122.
[13] Eurocode 2. “Design of Concrete Structures, Part 2: General Rules and Rules for Buildings”. European Committee for Standardization, Brussels, Belgium, 1992.