FLEXURAL BEHAVIOR OF ECC-CONCRETE HYBRID COMPOSITE BEAMS REINFORCED WITH FRP AND STEEL BARS

In order to study the flexural performance of engineered cementious composite (ECC) -concrete composite beams equipped with fiber reinforced polymer (FRP) steel bars and ordinary steel bars, the bending failure of 32 composite beams with mixed FRP bars and ordinary steel bars with different ECC height replacement rates was tested by a four-point loading test. The test results showed that, because the fiber material in ECC had excellent tensile properties, compared with ordinary concrete beams with the same reinforcement, cracking, yielding, ultimate bending moment and stiffness of hybrid and ECC beams were improved. The average crack spacing and width decreased with the increase of ECC height replacement rate. Although the reinforcement ratio of traditional ordinary concrete beams and hybrid reinforced composite beams was basically the same, the ductility of hybrid reinforced composite beams is higher than that of ordinary concrete beams, reinforced BFC beams had good energy dissipation capacity due to their excellent deformation capacity.