Flexural behaviour of glass fibre reinforced polymer (GFRP) bars subjected to elevated temperature

Maranan, G. B. and Manalo, A. C. and Karunasena, W. and Benmokrane, B. and Lutze, D. (2014) Flexural behaviour of glass fibre reinforced polymer (GFRP) bars subjected to elevated temperature. In: 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), 9-12 Dec 2014, Byron Bay, Australia.

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The FRP reinforced concrete structures may be exposed to high temperatures that may reduce the structural integrity of the bars, and eventually of the entire structure. Therefore, the thermal stability of the FRP bars must be thoroughly investigated before they can be fully utilized in the construction industry. The flexural strength testing has long been a staple technique for measuring the uniaxial tensile strength of the brittle materials because it is inexpensive and convenient to run rather than the direct tension test. Although the results obtained were not the absolute tensile data, they can provide an indication about the relative tensile performance of the FRP bars. In this study, the flexural behaviour of the GFRP bars of varying nominal diameters (12.7 mm, 14.0 mm, 15.9 mm, 17.0 mm, and 20.5 mm) subjected to elevated temperatures (up to 150 °C) was investigated. The results showed that as the temperature increases, the flexural strength and stiffness of the GFRP bars decreases. As the temperature approaches the glass transition temperature (Tg) of the bars, a drastic strength and stiffness reduction was observed. These findings were also observed in the pure tension testing of the FRP bars done by other researchers. The bars with a larger nominal diameter showed a better flexural strength decay resistance than those with a smaller nominal diameter at elevated temperatures. However, a comparable flexural stiffness deterioration was observed at an increasing temperature.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source. Creative Commons License Attribution 4.0.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 26 Jun 2015 01:49
Last Modified: 16 Feb 2017 03:34
Uncontrolled Keywords: FRP bar, thermal stability, flexural strength, tensile strength, glass transition temperature
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/27332

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