Capacity Prediction of RC Beams Strengthened with FRP by Artificial Neural Networks Based on Genetic Algorithm

Document Type : Regular Article


Department of Civil Engineering, University of New South Wales, Sydney, Australia


In this paper, the ability of the artificial neural network which was trained based on a Genetic algorithm used to predict the shear capacity of the reinforced concrete beams strengthened with the side-bonded fiber reinforced polymer (FRP). A database of experimental data including 95 data which were published in literature was collected and used to the network. Seven inputs including the width of the beam, effective depth, FRP thickness, Young modulus, the tensile strength of FRP and also FRP ratio were used to predict the shear capacity of the reinforced concrete beams strengthened with the side-bonded fiber reinforced polymer. The best values of the weights and the biases were obtained by the Genetic algorithm. For increasing the ability of the model to predict the considered target, it was suggested that the predicted values considered smaller. The results indicated that the proposed neural network based on genetic algorithm was able to predict the shear capacity of the considered elements.


Google Scholar


Main Subjects

[1]     Naderpour H, Mirrashid M. Application of Soft Computing to Reinforced Concrete Beams Strengthened with Fibre Reinforced Polymers: A State-of-the-Art Review. Comput Tech Civ Struct Eng 2015;38:305–23.
[2]     Mirrashid M. Earthquake magnitude prediction by adaptive neuro-fuzzy inference system (ANFIS) based on fuzzy C-means algorithm. Nat Hazards 2014;74:1577–93. doi:10.1007/s11069-014-1264-7.
[3]     Mirrashid M, Givehchi M, Miri M, Madandoust R. Performance investigation of neuro-fuzzy system for earthquake prediction. Asian J Civ Eng 2016;17:213–23.
[4]     Naderpour H, Mirrashid M. Compressive Strength of Mortars Admixed with Wollastonite and Microsilica. Mater Sci Forum 2017;890:415–8. doi:10.4028/
[5]     Beber A, Campos Filho A. CFRP composites on the shear strengthening of reinforced concrete beams. Rev IBRACON Estruturas 2005;1.
[6]     Carolin A, Täljsten B, Hejll A. Concrete Beams Exposed to Live Loading during Carbon Fiber Reinforced Polymer Strengthening. J Compos Constr 2005;9:178–86. doi:10.1061/(ASCE)1090-0268(2005)9:2(178).
[7]     Kim G, Sim J, Oh H. Shear strength of strengthened RC beams with FRPs in shear. Constr Build Mater 2008;22:1261–70. doi:10.1016/j.conbuildmat.2007.01.021.
[8]     Leung HY. Strengthening of RC beams: some experimental findings. Struct Surv 2002;20:173–81. doi:10.1108/02630800210456823.
[9]     Mitsui Y, Murakami K, Takeda K, Sakai H. A study on shear reinforcement of reinforced concrete beams externally bonded with carbon fiber sheets. Compos Interfaces 1997;5:285–95. doi:10.1163/156855498X00081.
[10]    Monti G, Liotta M. Tests and design equations for FRP-strengthening in shear. Constr Build Mater 2007;21:799–809. doi:10.1016/j.conbuildmat.2006.06.023.
[11]    Pellegrino C, Modena C. Fiber Reinforced Polymer Shear Strengthening of Reinforced Concrete Beams with Transverse Steel Reinforcement. J Compos Constr 2002;6:104–11. doi:10.1061/(ASCE)1090-0268(2002)6:2(104).
[12]    Sato Y, Ueda T, Kakuta Y, Tanaka T. Shear reinforcing effect of carbon fiber sheet attached to side of reinforced concrete beams. Proc. 2ND Int. Conf. Adv. Compos. Mater. Bridg. Struct. ACMBS-II, Montr., 1996.
[13]    Sim J, Kim G, Park C, Ju M. Shear strengthening effects with varying types of FRP materials and strengthening methods. 7th Int. Symp. Fiber-Reinforced Polym. Reinf. Concr. Struct., Citeseer; 2005, p. 1665–80.
[14]    Triantafillou TC. Shear strengthening of reinforced concrete beams using epoxy-bonded FRP composites. Struct J 1998;95:107–15.
[15]    Uji K. Improving shear capacity of existing reinforced concrete members by applying carbon fiber sheets. Trans Japan Concr Inst 1992;14.
[16]    Chaallal O, Nollet M-J, Perraton D. Strengthening of reinforced concrete beams with externally bonded fiber-reinforced-plastic plates: design guidelines for shear and flexure. Can J Civ Eng 1998;25:692–704. doi:10.1139/l98-008.
[17]    Chen JF, Teng JG. Shear capacity of FRP-strengthened RC beams: FRP debonding. Constr Build Mater 2003;17:27–41. doi:10.1016/S0950-0618(02)00091-0.
[18]    Deniaud C, Roger Cheng JJ. Reinforced Concrete T-Beams Strengthened in Shear with Fiber Reinforced Polymer Sheets. J Compos Constr 2003;7:302–10. doi:10.1061/(ASCE)1090-0268(2003)7:4(302).
[19]    Fanning P, Kelly O. Shear strengthening of reinforced concrete beams: an experimental study using CFRP plates. Struct Faults+ Repair 1999;99.
[20]    Jayaprakash J, Abdul Samad AA, Anvar Abbasovich A, Abang Ali AA. Shear capacity of precracked and non-precracked reinforced concrete shear beams with externally bonded bi-directional CFRP strips. Constr Build Mater 2008;22:1148–65. doi:10.1016/j.conbuildmat.2007.02.008.
[21]    Kachlakev DI, Barnes WA. Flexural and shear performance of concrete beams strengthened with fiber reinforced polymer laminates. Spec Publ 1999;188:959–72.
[22]    Kage T, Abe M, Lee HS, Tomosawa F. Effect of CFRP sheets on shear strengthening of RC beams damaged by corrosion of stirrup. Proc. Third Int. Symp. Non-Metallic Reinf. Concr. Struct. Japan Concr. Institute, Sapporo, Japan, 1997, p. 443–50.
[23]    Khalifa A, Nanni A. Improving shear capacity of existing RC T-section beams using CFRP composites. Cem Concr Compos 2000;22:165–74. doi:10.1016/S0958-9465(99)00051-7.
[24]    Tanarslan HM. Predicting the Capacity of RC Beams Strengthened in Shear with Side-Bonded FRP Reinforcements Using Artificial Neural Networks. Compos Interfaces 2011;18:587–614. doi:10.1163/156855411X615075.