Enhancing Fire Resistance Rating of Reinforced Concrete Members Strengthened with Externally Applied FRP Composites

Shakya A. M., Alkhrdaji T.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.1473-1484 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_128
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1473-1484
  • Keywords: FRP, Reinforced concrete, Strengthening, Fire resistance rating, Spray applied fire-proofing, Fire protection system
  • Istanbul Technical University Affiliated: No


Fiber reinforced polymer (FRP) systems have been widely used for strengthening of concrete members to accommodate various load increase needs. While FRP strengthening systems are designed to provide the required strength increase, the strengthened members also need to accommodate the new higher loads under fire conditions and meet the code specified fire resistance rating requirements. The fire resistance rating of FRP strengthened members can be enhanced using external fire protection systems, such as fiber boards, fiber blankets and spray-applied fire resistive materials. Current codes and standards such as ACI 216.1, PCI and Eurocode 2 do not provide any guidelines on how to calculate the fire resistance rating of concrete members with supplemental fire protection systems. This paper presents a rational design approach for evaluating the fire resistance rating of RC members strengthened with FRP and protected with cementitious spray applied fire protection systems. The proposed rational fire design approach mainly involves establishing thermal material properties of fire protection system, establishing fire performance of fire protection system through full-scale fire test, performing thermal analysis using finite element approach, performing sectional analysis at elevated temperatures and validating the design approach with data obtained from full-scale fire tests.