FLEXURAL PERFORMANCE OF DOUBLE HOOKED END STEEL FIBRE REINFORCED CONCRETE BEAMS UNDER CYCLIC LOADING

摘要

Steel fibre reinforced concrete (SFRC) is examined experimentally under cyclic loading. The effect of volumetric ratio and type of fibres on the mechanical properties and flexural strength of the SFRC beams are accessed. Multiple prismatic concrete specimens with two different types of steel fibres are fabricated and tested, under four-point bending according to ASTM C1609. Compressive and tensile strength characteristics using cylindrical specimens are determined. The two fibres have similar length to diameter ratio but different size. Two volumetric ratios (0.5% and 1%) are analyzed for each type of fibre. By increasing the volumetric ratio of the fibres, significantly are increased both the tensile and the compressive strengths. Higher post crack peak load and greater cumulative energy dissipation under cyclic loading are attained by increasing the steel fibre content. By adding 1% the volume of concrete, up to 93% the ultimate flexural strength under cyclic loading is enhanced. Although the two fibres have similar aspect ratios, steel fibre type B (larger size) shows higher flexural strength and energy dissipation than steel fibre type A (smaller size).