Performance of insulated FRP-strengthened concrete flexural members under fire conditions

Pratik P. Bhatt, Venkatesh K.R. Kodur, Anuj M. Shakya, Tarek Alkhrdaji

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

This paper presents the results of fire resistance tests on carbon fiber-reinforced polymer (CFRP) strengthened concrete flexural members, i.e., T-beams and slabs. The strengthened members were protected with fire insulation and tested under the combined effects of thermal and structural loading. The variables considered in the tests include the applied load level, extent of strengthening, and thickness of the fire insulation applied to the beams and slabs. Furthermore, a previously developed numerical model was validated against the data generated from the fire tests; subsequently, it was utilized to undertake a case study. Results from fire tests and numerical studies indicate that owing to the protection provided by the fire insulation, the insulated CFRP-strengthened beams and slabs can withstand four and three hours of standard fire exposure, respectively, under service load conditions. The insulation layer impedes the temperature rise in the member; therefore, the CFRP–concrete composite action remains active for a longer duration and the steel reinforcement temperature remains below 400°C, which in turn enhances the capacity of the beams and slabs.

Original languageEnglish
Pages (from-to)177-193
Number of pages17
JournalFrontiers of Structural and Civil Engineering
Volume15
Issue number1
DOIs
StatePublished - Feb 2021

Bibliographical note

Publisher Copyright:
© 2021, Higher Education Press.

Keywords

  • carbon fiber-reinforced polymers
  • concrete beams
  • concrete slabs
  • fire resistance
  • FRP strengthening
  • repair
  • retrofitting

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