Nonlinear analysis of statically-indeterminate SFRC columns

The structural behaviour of steel fibre reinforced concrete (SFRC) was studied using nonlinear finite-element analysis (NLFEA) using ABAQUS software. An interesting feature of this work is the consideration of statically-indeterminate SFRC columns. Most of SFRC specimens studied in the literature are focused on simply-supported beams and information on statically-indeterminate columns is sparse. In addition, both axial and lateral loads were also considered in order to allow for compression and flexural effects on the columns. The work aim was to examine the potential of using steel fibres to reduce the amount of conventional transverse steel reinforcement without compromising ductility and strength requirements. To achieve this, the spacing between shear links was increased while steel fibres were added as a substitute (the spacing between shear links was increased by 50% and 100%, while the fibre volume fraction (Vf) was increased to Vf = 1%, 1.5%, 2% and 2.5%). The numerical model was carefully calibrated against existing experimental data to ensure the reliability of its predictions. Parametric studies were subsequently carried out which provided
insight into how the steel fibres can help reduce the amount of conventional shear links.