International Research Journal of Innovations in Engineering and Technology - IRJIET International Open Access, Monthly, Peer Reviewed, Reputed Journal ISSN (online): 2581-3048

Impact Factor (2025): 6.9

DOI Prefix: 10.47001/IRJIET

Numerical Analysis of Flexural Behavior of Reinforced Concrete Beams Strengthened with Near Surface Mounted FRP Bars

Abstract

Recently, the near-surface-mounted (NSM) technique has become an attractive alternative to the externally bonded (EB) technique. Compared to the EB technique, the NSM technique is less exposed to external damage sources and provides a stronger bond between the FRP reinforcement and the surrounding concrete. A numerical investigation utilizing the non-linear finite element modeling (FEM) was performed using ANSYS®software to validate experimental results. Analytical models were conducted to simulate the flexural behavior of Reinforced Concrete (RC) beams strengthened with NSM FRP bars considering the FRP Cross-sectional area, end-anchoring of the CFRP bar, and strengthening by partially bonded systems with different unbonded lengths. It was found that the modeling approach could simulate the experimentally measured beams behavior at all stages of loading with an acceptable degree of accuracy.

Country : Egypt

1 Khadija Mohamed2 Ezz Eldin Mostafa3 Ayman Hussein

  1. MSc Student, Department of Structural Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt
  2. Assistant Professor, Department of Structural Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt
  3. Professor of Concrete Structures, Department of Structural Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt

IRJIET, Volume 6, Issue 10, October 2022 pp. 70-78

doi.org/10.47001/IRJIET/2022.610011

Full Paper
Download

References

  1. L. De Lorenzis and A. Nanni, “Strengthening of RC structures with near-surface mounted FRP rods,” Report, vol. 1999, no. 3, pp. 565–575, 2002.
  2. T. Hassan and S. Rizkalla, “Investigation of Bond in Concrete Structures Strengthened with Near Surface Mounted Carbon Fiber Reinforced Polymer Strips,” J. Compos. Constr., vol. 7, no. 3, pp. 248–257, 2003, doi: 10.1061/(asce)1090-0268(2003)7:3(248).
  3. B. Täljsten, A. Carolin, and H. Nordin, “Concrete structures strengthened with near surface mounted reinforcement of CFRP,” Adv. Struct. Eng., vol. 6, no. 3, pp. 201–213, 2003, doi: 10.1260/136943303322419223.
  4. T. K. Hassan and S. H. Rizkalla, “Bond mechanism of near-surface-mounted fiber-reinforced polymer bars for flexural strengthening of concrete structures,” ACI Struct. J., vol. 101, no. 6, pp. 830–839, 2004, doi: 10.14359/13458.
  5. A.S. Kalayci, B. Yalim, and A. Mirmiran, “Construction tolerances and design parameters for NSM FRP reinforcement in concrete beams,” Constr. Build. Mater., vol. 24, no. 10, pp. 1821–1829, 2010, doi: 10.1016/j.conbuildmat.2010.04.022.
  6. F. Al-Mahmoud, A. Castel, R. François, and C. Tourneur, “RC beams strengthened with NSM CFRP rods and modeling of peeling-off failure,” Compos. Struct., vol. 92, no. 8, pp. 1920–1930, 2010, doi: 10.1016/j.compstruct.2010.01.002.
  7. R. El-Hacha and S. H. Rizkalla, “Near-Surface-Mounted Fiber-Reinforced Polymer Reinforcements for Flexural Strengthening of Concrete Structures,” ACI Struct. J., vol. 101, no. 5, pp. 717–726, Sep. 2004, doi: 10.14359/13394.
  8. L. De Lorenzis and A. Nanni, “Shear strengthening of reinforced concrete beams with near-surface mounted fiber-reinforced polymer rods,” ACI Struct. J., vol. 98, no. 1, pp. 60–68, 2001, doi: 10.14359/10147.
  9. D. H. Lim, “Flexural Behavior of Concrete Structures Strengthened With Nsm and Eb Cfrp Strips,” Engineering, pp. 639–645, 2008.
  10. B. Islam Shokry Mohamed Aly Shabana, “FLEXURAL BEHAVIOUR OF RC BEAMS STRENGTHENED BY NEAR SURFACE MOUNTED FRP BARS,” 2018.
  11. A.C. 440, “ACI 440.1R-03. Guide for the design and construction of concrete reinforced with FRP bars,” Am. Concr. Inst. (ACI), Farmingt. Hills, Mich., USA, p. 42pp, 2003.
  12. ANSYS, No Title. ANSYS Mechanical, v15, Help system, 18.2 ed., 2015.
  13. E. Hognestad, N. W. Hanson, and D. McHenry, “Concrete Stress Distribution in Ultimate Strength Design,” ACI J. Proc., vol. 52, no. 12, pp. 455–480, Dec. 1955, doi: 10.14359/11609.
  14. J. Nie, J. Fan, and C. S. Cai, “Stiffness and Deflection of Steel–Concrete Composite Beams under Negative Bending,” J. Struct. Eng., vol. 130, no. 11, pp. 1842–1851, Nov. 2004, doi: 10.1061/(asce)0733-9445(2004)130:11(1842).
  15. Barbero, E.J., “Finite Element Analysis of Composite Materials Using ANSYS® - 2nd Edi.” https://www.routledge.com/Finite-Element-Analysis-of-Composite-Materials-Using-ANSYS/Barbero/p/book/9781466516892 (accessed Jun. 06, 2021).
  16. CEB-FIP, “CEB Bulletins : CEB-FIP Model Code 90 (PDF).” https://www.fib-international.org/publications/ceb-bulletins/ceb-fip-model-code-90-pdf-detail.html (accessed Jun. 07, 2021).
  17. R. A. Hawileh, “Nonlinear finite element modeling of RC beams strengthened with NSM FRP rods,” Constr. Build. Mater., vol. 27, no. 1, pp. 461–471, 2012, doi: 10.1016/j.conbuildmat.2011.07.018.
  18. L. De Lorenzis and J. G. Teng, “Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures,” Compos. Part B Eng., vol. 38, no. 2, pp. 119–143, 2007, doi: 10.1016/j.compositesb.2006.08.003.
  19. H. Y. Omran and R. El-Hacha, “Nonlinear 3D finite element modeling of RC beams strengthened with prestressed NSM-CFRP strips,” Constr. Build. Mater., vol. 31, pp. 74–85, 2012, doi: 10.1016/j.conbuildmat.2011.12.054.

Copyright @ 2026-2017 IRJIET. All Right Reserved.

Developed by Byzero Technologies