A non-linear finite element model (FEM) is developed to study the flexural behavior of steel fiber reinforced concrete filled steel tube column (SFRCFSC). A FE program using ANSYS software is applied in the analysis. A parametric study is performed to investigate the effect of steel fiber (SF) percentage in concrete on the ultimate strength of composite columns. Confinement of the concrete core provided by the steel case is also investigated. Modified design equations were implemented to Euro Code 4 and AISC /LRFD specification to consider the effect of fiber reinforced concrete in the design of composite beam columns. A comparison study between the analytical model output and the modified design equations’ results is performed and compliance is verified. It can be concluded that the increase of the SF from 0% to 4% enhances durability aspects and increases short and long columns’ flexural strength up to 30% and 50%, respectively. |
