Residual Strength of Concrete Beams Reinforced with GFRP Bars Exposed to Elevated Temperatures
| Autor: | Ali N. Abdullah, Muayad M. Kassim |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Tikrit Journal of Engineering Sciences, Vol 31, Iss 3 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1813-162X 2312-7589 |
| DOI: | 10.25130/tjes.31.3.3 |
| Popis: | The results of an experimental work to explore the effect of elevated temperatures on load resistance of reinforced concrete beams with glass fiber-reinforced polymers (GFRP) bars are reported in this paper. Twenty beams with cross-sectional dimensions of (120 x 200 x 1600 mm) were designed. Two specimens were evaluated at room temperature as reference beams, while the remaining eighteen were treated to high temperatures (200, 400, 600, and 800 °C) for 30, 60, and 90 minutes before being subjected to a similarly increased four-point load-up to the failure. The influence of raised temperature on load-deflection relationships as the failure modes for tested beams was examined and compared to a control beam. Compression failure is the most frequent failure mechanism in all the analyzed GFRP beams before and after exposure to high temperatures, according to the experimental test data. However, as the temperature and exposure time increased, the failure mode shifted from compression to balance and tensile failure. The beam heating was done under elastic loading, making these results unique. After 60 minutes of exposure to temperatures of 200, 400, 600, and 800 ⁰C, the residual loading capacity of heated beams was reduced by 13%, 17.39%, 32.6%, and 41.3%, respectively, compared to the control beam. |
| Databáze: | Directory of Open Access Journals |
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