Axial behaviour of rc members repaired after fire exposure with frp sheets

Ugur Demir*, Goktug Unal, Ugurcan Celik, Alper Ilki

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This study aims to assess the effects of a severe fire on the axial behaviour of reinforced concrete (RC) columns and the efficiency of repair through external fibre reinforced polymer (FRP) jacketing after fire exposure. In the scope of the research, results of an experimental work including a total of six square RC columns with dimensions of 300 x 300 x 500 mm are presented. The specimens had four longitudinal reinforcing bars each having 20 mm diameter while lateral confinement was maintained using stirrups with a diameter of 10 mm and a spacing of 100 mm. Four of the specimens were subjected to fire in a fire facility following ISO-834 fire curve for 90 minutes whereas two of the columns were kept at room temperature as reference specimens. Two of the fire damaged columns were repaired using two layers of carbon FRP (CFRP) sheets while other two specimens were bare columns without CFRP sheets. The columns were tested under uniaxial compression to investigate the effectiveness of CFRP sheets in repairing fire damaged structural members. Test results indicated that fire exposure adversely affected the axial load resistance, stiffness and ductility of the columns. On the other hand, in case of FRP jacketing, axial load resistance was restored and ultimate deformation capacity was remarkably increased. Furthermore, experimental study showed that the use of FRP did not restore the column’s axial stiffness which was remarkably reduced after fire exposure.

Original languageEnglish
Title of host publicationConcrete Innovations in Materials, Design and Structures - Proceedings of the fib Symposium, 2019
EditorsWit Derkowski, Piotr Gwozdziewicz, Lukasz Hojdys, Piotr Krajewski, Marek Pantak
Publisherfib. The International Federation for Structural Concrete
Number of pages7
ISBN (Print)9782940643004
Publication statusPublished - 2019
EventInternational fib Symposium on Concrete Innovations in Materials, Design and Structures, 2019 - Kraków, Poland
Duration: 27 May 201929 May 2019

Publication series

Namefib Symposium
ISSN (Print)2617-4820


ConferenceInternational fib Symposium on Concrete Innovations in Materials, Design and Structures, 2019

Bibliographical note

Publisher Copyright:
© fédération internationale du béton (fib). This document may not be copied or distributed without prior permission from fib.


  • Column
  • Fire
  • FRP
  • Reinforced concrete
  • Repair


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