An experimental study on flexural strengthening of RC beams using CFRP sheets

  • Authors

    • Yasmin Murad University of Jordan
    2018-09-10
    https://doi.org/10.14419/ijet.v7i4.16546
  • Angle, CFRP, Flexure, RC, Strengthening.

  • Abstract

     

    The use of carbon fiber reinforced polymer (CFRP) sheets is becoming a widely accepted solution for strengthening and repairing rein-forced concrete (RC) structures. To date, the behavior of RC beams, strengthened with 60Ëš and 45Ëš inclined CFRP sheets, has not clearly explained. An experimental program is proposed in this paper to investigate the flexural behavior of RC beams strengthened with CFRP sheets. CFRP sheets were epoxy bonded to the tension face to enhance the flexural strength of beams inducing different orientation angles of 0Ëš, 45Ëš, 60Ëš and 90Ëš with the beam longitudinal axis. The study shows that strengthening RC beams with CFRP sheets is highly influenced by the orientation angle of the sheets. The orientation angle plays a key role in changing the crack pattern and hence the failure mode. The influence of CFRP sheets was adequate on increasing the flexural strength of RC beams but the ductility of the beams was reduced. The best performance was obtained when strengthening RC beam obliquely using 45Ëš inclined CFRP sheets where the specimen experienced additional deflection and strength of 56% and 12% respectively and the reduction in its ductility was the least. It is recom-mended to strengthen RC beams, which are weak in flexure, using 45Ëš inclined CFRP sheets.

     

     

  • References

    1. [1] L. L. Away, “Key issues in the use of fi bre reinforced polymer (FRP) composites in the rehabilitation and retrofi tting of concrete structures.â€

      [2] A. Mofidi and O. Chaallal, “Tests and Design Provisions for Reinforced-Concrete Beams Strengthened in Shear Using FRP Sheets and Strips,†Int. J. Concr. Struct. Mater., vol. 8, no. 2, pp. 117–128, Jun. 2014. https://doi.org/10.1007/s40069-013-0060-1.

      [3] A. K. Samanta, D. K. Singha Roy, J. V Thanikal, N. Aravind, and S. Roy, “Retrofitting of Reinforced Concrete Beams Using Fibre Reinforced Polymer (Frp) Composites – A Review,†J. Urban Environ. Eng. J. Urban Environ. Eng. J. Urban Environ. Eng., no. 71, pp. 164–175, 2013.

      [4] J. Dong, Q. Wang, D. He, and Zhongwei Guan, “CFRP sheets for flexural strengthening of RC beams,†in 2011 International Conference on Multimedia Technology, 2011, pp. 1000–1003. https://doi.org/10.1109/ICMT.2011.6003160.

      [5] A. . Ashour, S. . El-Refaie, and S. . Garrity, “Flexural strengthening of RC continuous beams using CFRP laminates,†Cem. Concr. Compos., vol. 26, no. 7, pp. 765–775, Oct. 2004. https://doi.org/10.1016/j.cemconcomp.2003.07.002.

      [6] M. M. Önal, “Strengthening Reinforced Concrete Beams with CFRP and GFRP,†Adv. Mater. Sci. Eng., vol. 2014, pp. 1–8, Jul. 2014. https://doi.org/10.1155/2014/967964.

      [7] R. Kharatmol, P. Sananse, R. Tambe, M. Raksha, and J. Khare, “Strengthening of Beams Using Carbon Fibre Reinforced Polymer,†Int. J. Emerg. Eng. Res. Technol., vol. 2, no. 3, pp. 119–125, 2014.

      [8] T. Norris, H. Saadatmanesh, and M. R. Ehsani, “Shear and Flexural Strengthening of R/C Beams with Carbon Fiber Sheets,†J. Struct. Eng., vol. 123, no. 7, pp. 903–911, Jul. 1997. https://doi.org/10.1061/(ASCE)0733-9445(1997)123:7(903).

      [9] I. A. Bukhari, R. L. Vollum, S. Ahmad, and J. Sagaseta, “Shear strengthening of reinforced concrete beams with CFRP,†Mag. Concr. Res., vol. 62, no. 1, pp. 65–77, Jan. 2010. https://doi.org/10.1680/macr.2008.62.1.65.

      [10] B. B. Adhikary and H. Mutsuyoshi, “Behavior of Concrete Beams Strengthened in Shear with Carbon-Fiber Sheets,†J. Compos. Constr., vol. 8, no. 3, pp. 258–264, Jun. 2004. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:3(258).

      [11] Hana, A. Al-Asi, M. Abdel-Jaber, and M. Alqam, Modern applied science., vol. 11, no. 10. Canadian Centre of Science and Education, 2017.

      [12] Z. Zhang, C.-T. T. Hsu, and J. Moren, “Shear Strengthening of Reinforced Concrete Deep Beams Using Carbon Fiber Reinforced Polymer Laminates,†J. Compos. Constr., vol. 8, no. 5, pp. 403–414, Oct. 2004. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:5(403).

      [13] Z. Zhang and C.-T. T. Hsu, “Shear Strengthening of Reinforced Concrete Beams Using Carbon-Fiber-Reinforced Polymer Laminates,†J. Compos. Constr., vol. 9, no. 2, pp. 158–169, Apr. 2005. https://doi.org/10.1061/(ASCE)1090-0268(2005)9:2(158).

      [14] P. Alagusundaramoorthy, I. E. Harik, and C. C. Choo, “Flexural Behavior of R/C Beams Strengthened with Carbon Fiber Reinforced Polymer Sheets or Fabric,†J. Compos. Constr., vol. 7, no. 4, pp. 292–301, Nov. 2003. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:4(292).

      [15] C. A. Issa and A. AbouJouadeh, “Carbon Fiber Reinforced Polymer Strengthening of Reinforced Concrete Beams: Experimental Study,†J. Archit. Eng., vol. 10, no. 4, pp. 121–125, Dec. 2004. https://doi.org/10.1061/(ASCE)1076-0431(2004)10:4(121).

      [16] A. K. H. Kwan, J. C. M. Ho, and H. J. Pam, “Flexural strength and ductility of reinforced concrete beams.â€

  • Downloads

  • How to Cite

    Murad, Y. (2018). An experimental study on flexural strengthening of RC beams using CFRP sheets. International Journal of Engineering & Technology, 7(4), 2075-2080. https://doi.org/10.14419/ijet.v7i4.16546

    Received date: 2018-07-30

    Accepted date: 2018-08-17

    Published date: 2018-09-10