Authors : N. B. Bhopale; A.S. Manjarekar

Volume/Issue : Volume 9 - 2024, Issue 7 - July

Google Scholar : https://tinyurl.com/5muey5nt

Scribd : https://tinyurl.com/y4v2pcc9

DOI : https://doi.org/10.38124/ijisrt/IJISRT24JUL1964

Note : A published paper may take 4-5 working days from the publication date to appear in PlumX Metrics, Semantic Scholar, and ResearchGate.

Abstract : The rehabilitation, repair and strengthening of existing reinforced concrete (RC) structures is essential due to factors such as aging, steel reinforcement corrosion, construction/design defects, increased service loads demand, seismic events, and advancements in design guidelines. Fiber-reinforced polymers (FRP) are now being recognized as a promising material for the rehabilitation of such structures, through strengthening or repairing. In buildings and bridges, RC sections are commonly found in the form of beams and girders. Shear failure of RC beams is particularly due to its sudden occurrence without warning. Therefore, the utilization of externally bonded (EB) FRP composites for shear strengthening of RC beams has gathered popularity as a structural enhancement technique, primarily due to advantages of FRP composites, such as high strength-to- weight ratio and exceptional corrosion resistance. In addition, FRP repair systems give a cost-saving choice to traditional repair methods and materials. A study was performed to analyse the shear characteristics of RC beams enhanced with continuous glass fiber-reinforced polymer (GFRP) sheets. Reinforced concrete beams externally bonded GFRP sheets subjected to failure using a symmetrical two-point concentrated static loading system. The experimental data obtained included load, deflection, and failure modes of each beam, along with the effect of the number of GFRP layers on the beams The failures observed in strengthened beams typically commence with the debonding of the FRP sheets, followed by brittle shear failure. The shear capacities of these beams were higher than that of the control beam.

Keywords : Rehabilitation, RC, GFRP, Shear Strengthening, Externally Bonded (EB).

References :

1. H. Saadatmanesh and M. R. Ehsani, “RC Beams Strengthened with GFRP Plates: Experimental Study,” ASCE, vol. 117, no. 11, pp. 11–3417, Nov. 1991.
2. A. Nanni, M. S. Noms, and N. M. Bradford, “Lateral Confinement of Concrete Using FRP Reinforcement,” Fiber-Reinforced-Plastic Reinforcernent for Concrete Structures, International Symposium, ACT, vol. SP-l38, pp. 193–209, 1993.
3. D. Kachlakev and D. D. McCurry, “Behavior of full-scale reinforced concrete beams retrofitted for shear and flexural with FRP laminates,” Composites Part B: Engineering, vol. 31, no. 6–7, pp. 445–452, 2000.
4. M.C. Sundarraja, S. Rajamohan, “Strengthening of RC beams in shear using GFRP inclined strips – An experimental study,” Construction and Building Materials, vol. 23, no. 2, pp. 856–864.
5. M. A. A. Saafan, “Shear Strengthening of Reinforced Concrete Beams Using GFRP Wraps,” Czech Technical University in Prague, vol. Acta Polytechnica Vol. 46, no. 1, pp. 24-32., 2006.
6. Pannirselvam, N., Raghunath, P. N.and Suguna, K.., “Strength Modeling of Reinforced Concrete Beam with Externally Bonded Fibre Reinforcement Polymer Reinforcement,” vol. 1, No. 3, 2008.
7. E. S. Khalifa and S. H. Al-tersawy, “Experimental and analytical investigation for enhancement of flexural beams using multilayer wraps, Composites Part B: Engineering,” Volume, vol. 45, no. 1, pp. 1432–1440, 2013, doi: 10.1016/j.compositesb.2012.08.021.
8. M. M. Önal, “Strengthening Reinforced Concrete Beams with CFRP and GFRP,” Advances in Materials Science and Engineering, vol. 2014, p. 967964, Jul. 2014, doi: 10.1155/2014/967964.
9. Dong, J. F, Yuan, S. C., He, D, and Wang, Q, “Shear Behaviour of RC Beams Strengthened with FRP Materials.,” Advanced Materials Research, vol. 463, pp. 249–253, 2012.
10. Todupunoori Shiva Sai,G.A.V.S. Sandeep Kumar, N. Kiran, and C. T. A, “Behaviour of Reinforced Concrete Beams Bonded with Glass Fibre Reinforced Polymer and Carbon Fibre Reinforced Polymer Sheets,” IJEAT, vol. 9, no. 3, pp. 134–138, Feb. 2020, doi: 10.35940/ ijeat.C4845.029320.
11. Carlo Pellegrino, Claudio Modena, “Fiber-Reinforced Polymer Shear Strengthening of Reinforced Concrete Beams: Experimental Study and Analytical Modeling,” ACI Structural Journal -, Jan. 2006.
12. M Talha Junaid, Salah Altoubat, Abdul Saboor Karzad, Abdalla Elbana, “Experimental study on shear response of GFRP reinforced concrete beams strengthened with externally bonded CFRP sheets,” Structures, Nov. 2021.
13. R Kotynia, A Marí, E Oller, M Kaszubska, “Efficiency of shear strengthening of RC beams with externally bonded FRP materials – State-of-the-art in the experimental tests,” Composite Structures, Mar. 2021.
14. IS 12269-1987, Specification for 53 grade Ordinary Portland Cement, BIS. India: New Delhi.
15. IS 269:2015 : Ordinary Portland Cement -Specification.” 2015.
16. IS 4031-1988: Methods of physical tests for cement.”.
17. IS 383-1970, Specification for Coarse and Fine Aggregate from Natural Sources for Concrete, BIS. India: New Delhi.
18. IS 2386 Part III-1963, Methods of test for Aggregates for Concrete, BIS. Delhi: New.
19. IS 10262-1982, Recommended Guidelines for Concrete Mix Design, BIS. India: New Delhi.
20. IS 1786 (2008): High strength deformed steel bars and wires for concrete reinforcement-”.
21. IS 432-1 (1982): Mild Steel and Medium Tensile Steel Bars and Hard-Drawn Steel Wire for Concrete Reinforcement, Part 1: Mild Steel and Medium Tensile Steel Bars”.