Flexural Behaviour of Concrete Beams Reinforced With GFRP Rebars (original) (raw)
This study reports test results of 12 concrete beams measuring 150mm wide × 180mm deep× 1200mm long reinforced with glass fiber-reinforced polymer (GFRP) bars subjected to a four-point loading system. The test specimens were classified into three groups according to the concrete compressive strength. The main variation done for each beam in all the three groups was a percentage of reinforcement (0.5%, 1%, 1.5% and 2%). Since all the beams were over reinforced failure occurred due to rupture of concrete at compression zone. The failure is initiated by a vertical crack at the midspan which extended up to compression zone of the beam and propagated horizontally which leads to bond failure between top concrete and compression reinforcement. The test results revealed that the crack widths and mid-span deflection significantly reduced by increasing the reinforcement ratio. The ultimate load increased by 7.5%, 16.8%, 27.7% as the reinforcement percentage increased from 0.5% to 1%, 1.55 and 2% respectively. The flexural provisions of structural design guidelines namely ACI 440.1R-06, ECP 208-2005, and CSA S806-12 were evaluated against the test data. ACI 440.1R-06 overestimates the moment resistance of GFRP bars as compared to other codes and experimental results. Whereas all the design guidelines predict nearly the same values for deflection. And for crack width approximation Toutanji's equation is more accurate compared to ACI equation.
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