Theoretical and experimental study on shear behaviour of hybrid fibre-reinforced concrete deep beam

Abstract

This paper proposes an analytical method for predicting the shear capacity of hybrid fibre-reinforced concrete (HFRC) deep beams based on the softened strut-and-tie model. Moreover, a test was conducted to evaluate the proposed method and further investigate the shear behaviour of HFRC deep beam. The shear and deformation capacities of HFRC deep beams increased with the steel fibre volume. The shear capacity also increased with the web reinforcement ratio; however, the deformation capacity first increased and then slightly decreased. The steel fibre volume slightly affected the HFRC deep beam stiffness, and the increase in web reinforcement ratio improved the stiffness retention. The strains in concrete and reinforcement in the HFRC deep beam were relieved by the increase in the steel fibre volume. Although the increase in the web reinforcement ratio reduced the strain in the HFRC deep beam reinforcement, it only slightly affected the strain in the concrete.