Akademik Veri Yönetim Sistemi
ENGINEERING STRUCTURES, cilt.319, 2024 (SCI-Expanded, Scopus)
This paper presents an experimental study and nonlinear finite element analysis (NLFEA) using the FE ANSYS (c) code modelling the composite effect of stirrups and steel fibres on the shear behaviour of reinforcedconcrete beams. To achieve this objective, fifty-eight (58) steel-fibre-reinforced concrete (SFRC) beams made of normal- strength concrete (NSC) and high-strength concrete (HSC) with and without stirrups were tested under bending and subjected to two concentrated and symmetrical loads using digital image correlation (DIC). The main test variables were concrete compressive strength (C30 and C60 MPa), stirrup aspect ratio (0 % and 0.56 %), steel fibre volume fraction (0 %, 0.5 %, 1 %, 2 % and 3 %) and steel fibre aspect ratio (lf/df f /d f of 65 and 80). The experimental results show that the shear capacity of SFRC beams increases significantly as the percentage of steel fibres increases. The combination of stirrups and steel fibres can change the failure mode of the beams from brittle by shear to ductile by bending. The shear behaviour of SFRC beams without stirrups is similar to, and sometimes better than, that of SFRC beams with stirrups, suggesting the possibility of replacing stirrups with steel fibres in sufficient quantities. The measured shear strength is compared with the theoretical values obtained from the models available in the literature, and the correlation is satisfactory. Acceptable agreement was also found between the experimental and NLFEA results for the first diagonal crack load and ultimate load. The predicted FE values for the steel-fibre orientation factor of 0.45 are in agreement with the experimental values.