Analytical Model for Predicting the Torsional Capacity of Thin Walled Tubular RC Beams Strengthened with NSM CFRP Laminates

Gowda C., Barros J., Guadagnini M.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.1331-1343 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_115
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1331-1343
  • Keywords: Torsional strengthening, Near surface mounted (NSM), Carbon fiber reinforced polymers (CFRP), Analytical model, Space truss analogy, SHEAR-STRENGTH, CONCRETE, DESIGN, MEMBERS
  • Istanbul Technical University Affiliated: No


An analytical model to predict the torsional moment capacity and the type of failure of thin walled tubular reinforced concrete elements strengthened with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) laminates is proposed. The model implements the thin walled space truss analogy, which forms the basis of current design codes, and evaluates the torsional capacity as a combination of the resistance offered by the transverse steel reinforcement and CFRP laminate reinforcement. The contribution of the steel reinforcement is limited by its yield strength and that of the CFRP laminates by an effective maximum strain. The model also implements the modified compressive field theory to evaluate the concrete compressive strut inclination.