Abstract
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 language | English |
|---|---|
| Title of host publication | Proceedings of the fib Symposium 2019 |
| Subtitle of host publication | Concrete - Innovations in Materials, Design and Structures |
| Editors | Wit Derkowski, Piotr Krajewski, Piotr Gwozdziewicz, Marek Pantak, Lukasz Hojdys |
| Publisher | International Federation for Structural Concrete |
| Pages | 1594-1600 |
| Number of pages | 7 |
| ISBN (Electronic) | 9782940643004 |
| Publication status | Published - 2019 |
| Event | fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures - Krakow, Poland Duration: 27 May 2019 → 29 May 2019 |
Publication series
| Name | Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures |
|---|
Conference
| Conference | fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures |
|---|---|
| Country/Territory | Poland |
| City | Krakow |
| Period | 27/05/19 → 29/05/19 |
Bibliographical note
Publisher Copyright:© Federation Internationale du Beton (fib) - International Federation for Structural Concrete, 2019.
Funding
This research was supported by ITU Scientific Research Department (Project No: 39548) and The Scientific and Technological Research Council of Turkey (TUBITAK) under grant number 216M535. The authors are thankful to the Yapı Merkezi Prefabrication Inc., Allianz Insurance Inc., Turk YTONG Inc., Fibrobeton Inc. for the financial supports. The staff of ITU Structural and Earthquake Engineering and Infrastructure Materials Laboratories, and Fire Laboratory at Turkish Standard Institute are also acknowledged.
| Funders | Funder number |
|---|---|
| Allianz Insurance Inc. | |
| Fibrobeton Inc. | |
| ITU Scientific Research Department | 39548 |
| TUBITAK | 216M535 |
| Yapı Merkezi Prefabrication Inc. | |
| Türkiye Bilimsel ve Teknolojik Araştirma Kurumu |
Keywords
- Column
- FRP
- Fire
- Reinforced concrete
- Repair
