Abstract
This paper investigates the behaviour of Concrete-Filled FRP Tubes (CFFT) as columns. The experimental programme consists of preparing and testing one steel column acting as control sample and three columns made with GFRP. The GFRP tubes were produced by filament winding method where the amount and orientation of the fibres was changed. The tubes had dimensions of 1000x100 mm (length x diameter) and were filled with C25/30 concrete. The columns were tested under compression and the load was applied at a pace rate of 0.5 mm/min. It was found that the GFRP tubes can efficiently confine the concrete and could be used as alternative material to steel tubes. The steel and GFRP samples developed a high level of strain throughout the testing. The GFRP sample with fibre orientation of 90° failed by FRP rupture, whereas the remaining samples failed by buckling. The orientation of the fibres at 90° was more efficient than orientation of fibres at 45° in terms of increasing the ultimate capacity. The GFRP samples displayed lower ultimate capacity compared to steel samples with same wall thickness, but increasing the wall thickness of the GFRP columns increased the ultimate load accordingly.
Highlights
Reinforced Concrete (RC) structures require periodic maintenance and monitoring in order to sustain their design life and durability
The parametric study on carbon Fibre Reinforced Polymer (FRP) tubes shows that fibre orientation, FRP bar reinforcement ratio and confinement ratio has a direct impact on P – M interactions of Concrete-Filled FRP Tubes (CFFT) columns
The FRP-45 and the FRP-90 sample had the same wall thickness, there was a significant variation in their respective ultimate load
Summary
Reinforced Concrete (RC) structures require periodic maintenance and monitoring in order to sustain their design life and durability. The behaviour of Concrete Filled FRP Tubes (CFFT) have been investigated in the literature for new columns as alternative to CFST and steel RC columns [4], [8,9,10,11,12,13,14]. In this method, FRP tubes are used as formwork to contain the fresh concrete which results in significant cost reduction [5]. The parametric study on carbon FRP tubes shows that fibre orientation, FRP bar reinforcement ratio and confinement ratio has a direct impact on P – M (axial load – moment) interactions of CFFT columns. This research is aimed to enhance and reinforce the current understanding of confining concrete compression elements
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