Experimental Investigation on the Flexural Behaviour of Hybrid Glass Fiber Reinforced Polymer (GFRP)-Steel Reinforced Concrete Beam
摘要
This study experimentally investigated the flexural performance of four concrete beams reinforced with concrete hybrid beams reinforced with different configurations of Glass Fiber Reinforced Polymer (GFRP) bars. Four beams with identical dimensions (2200 mm in length, 150 mm in width, and 250 mm depth) were tested under four point bending flexural tests. Two beam was reinforced with a hybrid combination of GFRP-steel rebar, while one beam used conventional RC beam and another one reinforced with GFRP bars. The hybrid configuration includes of one beam GFRP bars positioned in tension zone and another one GFRP bar positioned in compression zone was place at tension part. Meanwhile another one the GFRP bars placed at compression part. The results revealed that beams reinforced with longitudinal GFRP bars in the compression zone exhibited superior flexural strength, achieving a 17.58% higher load-bearing capacity than the conventional steel-reinforced beam. Moreover, this configuration provided the highest balanced deflection capacity (83.79%), indicating an improved ability to absorb energy before failure. Despite these advantages, GFRPB-C displayed nonlinear elastic behaviour until failure, meaning they lacked plastic deformation and did not exhibit a clear yield point. Consequently, the GFRP-reinforced beams failed primarily in shear, highlighting their vulnerability to sudden failure due to crack propagation. These finding suggest that the strategic placement of GFRP in hybrid system can significantly improve the structural performance of RC beam.