Simulation Behavior of Flexure in Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Polymer (CFRP)

Abstract:

When reinforced concrete (RC) beams are found deficient in flexure, and fails in shear capacity after shear strengthening, the need to use new technique for flexure strengthening become important. Over the years, there are many experimental studies had been carried out with this technique of strengthening, and finding from other researchers have proved to be effective and successful. In this study, the behavior of flexure in RC beams strengthened with carbon fiber reinforced polymer (CFRP) were investigated. ANSYS11 software package of finite element method was use to simulate two models of RC beams with different parametric study such as (i) effect of grade of concrete, (ii) number of layers of CFRP strips, (iii) effect of steel stirrups and CFRP strips and (iv) longitudinal reinforcement yield stress. The results show that for beams strengthened with CFRP has increased in capacity load up to 32.8%. In general, good agreement between the FE solution and the available experimental results has been obtained.

• Periodical: Applied Mechanics and Materials (Volumes 754-755)
• Pages: 432-436
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.754-755.432
• Online since: April 2015
• Authors: Ibrahim H. Alfahdawi*, S.A. Osman
• Keywords: Carbon Fiber Reinforced Polymer, Finite Element Method, Flexure Strengthening, Reinforced Concrete Beam, Steel Stirrups

References

[1] Mohamed H. Mahmoud, Hamdy M. Afefy, Nesreen M. Kassem and Tarek M. Fawzy. Strengthening of defected beam-column joints using CFRP. Journal of Advanced Research, 5, pp: 67-77 (2014).

DOI: 10.1016/j.jare.2012.11.007

[2] Tara Sen and H.N. Jagannatha Reddy. Strengthening of RC beams in flexure using natural jute fibre textile reinforced composite system and its comparative study with CFRP and GFRP strengthening systems. International Journal of Sustainable Built Environment, 2, pp: 41-55 (2013).

DOI: 10.1016/j.ijsbe.2013.11.001

[3] Al-Mahaidi R., Lee K. and Susa J. Strengthening of shear-damaged reinforced concrete T-beam bridges with CFRP strips. ACUN international composites meeting, Sydney Australia, 17(1), pp: 48-54 (1999).

[4] Soudki K., El-Salakawy E. and Craig B. Behavior of CFRP strengthened reinforced concrete beams in corrosive environment. Journal of composites for construction, 11(3), pp: 291-298 (2007).

DOI: 10.1061/(asce)1090-0268(2007)11:3(291)

[5] Smith S. and Teng J. FRP-strengthened RC beams. I: Review of debonding strength models. Engineering Structures, 24(4), pp: 385-395 (2007).

DOI: 10.1016/s0141-0296(01)00105-5

[6] Taljsten. Strengthening concrete beams for shear with CFRP sheets. Construction and Building Materials, 17(1), pp: 15-26 (2003).

DOI: 10.1016/s0950-0618(02)00088-0

[7] Izzet. Retrofit of shear critical RC beams with carbon fiber reinforced polymers. Journal of Structural Engineering, 152(3), pp: 4-11 (2008).

[8] William K. J and Warnke E. D. Constitutive model for the triaxial behavior of concrete. Proceeding International Association. Bergamo: Bridge and Structural Engineering, ISMES (1975).