Effect of FRP Bar Type on the Behaviour of Shear-Strengthened Reinforced Concrete T-beams

Sogut K., Dirar S., Theofanous M., Faramarzi A.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.1353-1363 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_117
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1353-1363
  • Keywords: Beams, Deep embedment, FRP, Reinforced concrete, Shear strengthening, DEEP EMBEDMENT
  • Istanbul Technical University Affiliated: No


This paper presents experimental and numerical investigations on the behaviour of reinforced concrete (RC) T-beams strengthened in shear with deep embedment (DE) fibre reinforced polymer (FRP) bars. The tests were carried out on an unstrengthened beam as well as two beams strengthened in shear with embedded glass FRP (GFRP) or carbon FRP (CFRP) bars. The gain in shear strength increased by 28.1 kN (37.2%) with the increase in FRP elastic modulus from 46 to 130 GPa, demonstrating the important influence of DE FRP bar elastic modulus on the shear strength enhancement. The DE CFRP strengthened beam had higher post-cracking stiffness than both the unstrengthened control beam and the DE GFRP strengthened beam. A finite element (FE) model was developed and validated. A FE parametric study involving beams nominally identical to the tested beams revealed that an increase in steel-to-FRP shear reinforcement ratio instigates a decrease in shear strength enhancement.