Deformation Behavior of Reinforced Concrete Two-Way Slabs Strengthened with Different Widths and Configurations of GFRP

Hossein Izadi, Hamid Pesaran Behbahani


In this paper, we conducted a numerical analysis of the deformation behavior of Steel-reinforced concrete (RC) two-way slabs strengthened by glass fiber reinforced polymer (GFRP) with different widths and configurations. A total number of 36 RC slabs of  cm were used in this numerical study. Also, a column of  was considered in the center of the slab for applying static loading. The bonded GFRP strips had 5, 7.5 and 10 cm width (W) and configured in three models called PM1, PM2, and DM. In PM1 (strip length = 2.4 m) and PM2 (strip length =1.7 m) configurations, the strips were bonded in two directions parallel to the sides of the slab, while in DM configuration (strip length =1.7 m), strips were rotated with 45 degree angle around the central axis that is perpendicular to the surface of the slab. According to the comparison results, we found out that the 5-cm wide strips with PM1 configuration having a parallel space of 0.5 times the strip width ( ) greatly reduced the deformation of RC two-way slab compared to other strip widths and configurations, while  strips under all configurations, highly increased the deformation when space between strips varied from  to .


Glass Fiber Reinforced Polymer; Reinforced Concrete Slabs; Finite Element Analysis.


Balamuralikrishnan A., and Antony Jeyasehar, C. “Flexural Behavior of RC Beams Strengthened with Carbon Fiber Reinforced Polymer (CFRP) Fabrics”. The Open Civil Engineering Journal, 3(2009): 102-109.

Smith, S. T., and Teng, J. G. “FRP-strengthened RC beams. I: review of debonding strength models”. Engineering Structures, , 24, no. 4 (2002): 385-395.

Smith, S. T., and Teng, J. G. “FRP-strengthened RC beams. II: assessment of debonding strength models”. Engineering Structures, 24, no. 4 (2002): 397-417.

Erki, M. A., and Heffernan, P. J. “Reinforced concrete slabs externally strengthened with fibre-reinforced plastic materials”. RILEM Proceedings, 29(1995): 509-516.

Hisabe, N., Sakai, H., Otaguro, H., and Yagi, K. Flexural reinforcing effect of reinforced concrete slab strengthened with carbon fiber sheet under oscillation loading. Non-Metallic (FRP) Reinforcement for Concrete Structures, Proceedings of the Third International Symposium, Sapporo Japan, 1997, pp. 335-342.

Karbhari, V.M., and Seible, F. “Fiber Reinforced composites–advanced materials for the renewal of civil infrastructure”. Applied Composite Materials, 7, no. 2 (2000): 95–124.

Shahawy, M. A., Beitelman, T., Arockiasamy, M., and Sowrirajan, R. “Experimental investigation on structural repair and strengthening of damaged prestressed concrete slabs utilizing externally bonded carbon laminates”. Composites Part B: Engineering, 27, no. 3-4 (1996): 217-224.

Smith, S.T. and Teng, J.G. “Interfacial stresses in plate beams”. Engineering Structures, 23, no. 7 (2001): 857-871.

Mazzotti, C., Savoia, M., and Ferracuti, B. “An experimental study on delamination of FRP plates bonded to concrete”. Construction and Building Materials, 22(2008): 1409-1421.

Elsanadedy, H.M., Almusallam, T.H., Alsayed, S.H., and AL-Salloum, Y.A. “Experimental and FE Study on RC One-Way Slabs Upgraded with FRP Composites”. KSCE Journal of Civil Engineering, 19, no. 4(2015): 1024-1040.

Teng, J. G. , Lam, L., Chan W., and Wang, J. “Retrofitting of deficient RC cantilever slabs using GFRP strips”. Journal of Composites for Construction, 4, no. 2 (2000): 75-84.

Seim, W., Horman, M., Karbhari, V., and Seible, F. “External FRP poststrengthening of scaled concrete slabs.” Journal of Composites for Construction, 5(2001):67-75.

Zhang, J. W., Teng, J. G., Wong, Y. L., and Lu, Z. T. “Behavior of two-way RC slabs externally bonded with steel plate”. Journal of Structural Engineering, 127, no. 4(2001): 390-397.

Arduini, M., Nanni, A., and Romagnolo, M. “Performance of one-way reinforced concrete slabs with externally bonded fiberreinforced polymer strengthening”. ACI Structural Journal, 101, no. 2(2004): 193-201.

Xue, W., Zhang, S., and Ge, C. “Composite Performance of FRP-Concrete Composite Slabs”. Journal of Residuals Science & Technology, 13, supplement 2(2016): S153-S161.

Elsayed, W., Ebead, U. A., and Neale, K. W. “Interfacial behavior and debonding failures in FRP-strengthened concrete slabs”. Journal of Composites for Construction, 11, no. 6(2007): 619-628.

Lesmana, C. and Hu, H-T. “Parametric analyses of square reinforced concrete slabs strengthened by fiber-reinforced plastics”. Construction and Building Materials, 53(2014): 294-304.

Lu, X. Z., Teng, J. G., Ye, L. P., and Jiang, J. J. “Intermediate crack debonding in FRP-strengthened RC beams: FE analysis and strength model”. Journal of Composites for Construction, 11, no. 2(2007): 161-174.

Abaqus (v.6.13). Abaqus User’s Guide, 2013.Available at:

Hognestad, E. A study on combined bending and axial load in reinforced concrete members. Technical Report, University of Illinois Engineering Experiment Station, University of Illinois at Urbana-Champaign, IL, 1952, pp.43-46.

Agbossou, A., Michel, L., Lagache, M., and Hamelin, P. “Strengthening slabs using externally-bonded strip composites: Analysis of concrete covers on the strengthening”. Composites Part B: Engineering, 39, no. 7(2008): 1125–1135.

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DOI: 10.28991/cej-030942


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