Sirach, N., Smith, S.T., Yu, T., Mostafa, A., and Tang, Z.S. (2019) Confinement of concrete columns with large rupture strain FRP composites. In: Proceedings of the 7th Asia-Pacific Conference on FRP in Structures. From: APFIS 2019: Seventh Asia-Pacific Conference on FRP in Structures, 10-13 December 2019, Gold Coast, QLD, Australia.

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Abstract

Fibre-reinforced polymer (FRP) composites can be used as a confinement mechanism to improve the strength and ductility of concrete columns. In recent years, a number of large rupture strain (LRS) FRP composites have emerged, namely polyethylene naphthalate (PEN) and polyethylene terephthalate (PET), and they are a promising solution for the seismic retrofitting of reinforced concrete (RC) columns. These composites are desirable as they are made from recycled plastic bottles, making them a cheaper and more environmentally friendly alternative to traditional FRPs (i.e. carbon FRP and glass FRP). This paper presents an experimental study on the axial compressive behavior of LRS FRPconfined normal-strength concrete columns. The effect of FRP layers on the stress-strain behavior of these columns is investigated. Furthermore, several tests on traditional FRP-confined columns were tested in parallel and these results are used to make comparisons to those LRS FRP-confined columns. Results show that LRS FRP-confined columns achieve a similar ultimate strength and significantly higher ultimate strains to their traditional FRP counterpart when the confining ratio is similar.

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