10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.484-495
As a part of this study, 25 filament wound +55 degrees glass fibre-reinforced polymer (GFRP) tubes were tested in uniaxial compression and six in uniaxial tension. For the compression tests, tubes with two inner diameters (ID) were tested: 76.2 mm and 203.2 mm, as well as three nominal pressure ratings: 350 kPa, 700 kPa and 1050 kPa. Each compression specimen was cut such that the length was twice the outer diameter (OD). The compression test set-up is presented in Fig. 1 a. For each tube type, five identical specimens were tested in compression. Only two tube types were tested in tension: 76.2 mm diameter tubes with pressure ratings of 350 kPa and 1050 kPa. A novel test method presented in Fig. lb was used to test the tubes in tension. For each tube type, three identical specimens were tested in tension. The main test parameter was the effect of the D/t ratio on specimen stiffness and strength in both compression and tension. The tests showed that the tubes exhibit a nonlinear stress-strain response when loaded in both tension and compression and that, when loaded in tension, there is a significant post-peak behaviour. The tests also showed that the tubes were stronger in compression than in tension.