A REVIEW OF HYBRIDISED USE OF FIBRES IN SHEAR BEHAVIOUR OF FIBRE-REINFORCED CONCRETE BEAMS

Abstract

Shear failure of the concrete beam is always disastrous due to unnoticed occurrences and is avoided in construction. Introducing fibres into concrete elements has provided significant shear support to reinforced concrete beam structures through stress redistribution after initial cracking and bridging mechanisms. Given their advantages over single fibre strengthening in past years, using hybrid fibres in an optimal combination as strengthening in cementitious materials has drawn much interest. However, research on this area remains inexhaustible based on the emerging various fibre combinations and the challenge of unnoticed concrete shear failure. Therefore, reviewed research articles on shear performances of Fibre Reinforced Concrete (FRC) beams considering the effect of fibre volume, lengths and orientation on the synergy. The findings reveal the possibility of synergising fibre to enhance reinforced concrete beam(RCB) shear performance for metallic-metallic, metallic-synthetic, synthetic-synthetic, and metallic-biofibre combinations, with varying performance. Using low-strength/modulus fibre with high strength has been effective for shear resistance. Also, beam type (deep/shallow), fibre type and volume fractions, length, aspect ratio, orientation and distribution remarkably affect the shear performance of RC beams.