Akin-Adeniyi, Ayomide John and Covenant University, Theses (2023) STRUCTURAL BEHAVIOUR OF FIRE-DAMAGED REINFORCED CONCRETE BEAMS RETROFITTED WITH BAMBOO FIBRE LAMINATE. Masters thesis, Covenant University Ota.
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Abstract
Fire occurrences in building is becoming increasingly frequent as a result of accidents, the presence of combustible items in buildings, particularly residential buildings, and other potential sources of fire. When there is a fire occurrence in a building, the structural integrity of such building is affected. In order for such building to be habitable again, it has to either be strengthened or rebuilt. The common practice for fire-damaged buildings is to be abandoned or demolished, whereas such buildings could be assessed and strengthened for it to regain its initial load carrying capacity. Several studied have investigated methods for strengthening reinforced concrete (RC) beams impaired by fire using synthetic FRP composites but little or no studies has been done on the usage of natural FRP composite to strengthen a RC beam impaired by fire. This study investigated the usage of bamboo fibre laminate to retrofit a fire damaged RC beam and the structural behaviour of the beam was observed. Eight RC beams were designed, cast, and reinforced normally. Two of the beams were the control samples. The remaining six beams were exposed to three different temperatures (400, 600 and 800 °C) in pairs of two. One out of each pair was retrofitted with bamboo fibre laminate. Subsequently, each beam underwent testing until failure, with loads increasing in 0.5 tons increment. The outcomes revealed that the utilization of bamboo fibre laminate had the capability to enhance both the ability to carry load and deflection characteristics of a beam that had been impaired by fire. For beams exposed to 400 °C the load-carrying capacity returned to that observed in the control beam and the deflection was increased by 48.78% in relation to the control beam. In the case of beams exposed to 600 °C, the bamboo fibre laminate increased the load-carrying capacity by 29.5% beyond that of the unstrengthened fire-damaged beam but 5% less than the control beam. The deflection was also increased by 39.37% relative to the control beam. When considering beams exposed to 800 °C, the bamboo fibre laminate increased the ability to carry load by 37% beyond the unstrengthened fire-damaged beam but 10% less than the control beam. The deflection was also increased by 4.83% relative to the control beam. This study demonstrated that bamboo fibre laminate is a viable alternative for strengthening fire-damaged beams instead of using synthetic fibres.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | RC beam; bamboo fibre; fibre reinforced polymer; impaired, fire, fire-damaged beam; strengthening; load-carrying capacity. |
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | nwokealisi |
| Date Deposited: | 11 Sep 2023 11:15 |
| Last Modified: | 11 Sep 2023 11:15 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/17295 |
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