Influence of axial compression on a steel tubular stub column filled with reinforced concrete for sustainable infrastructure

Due to their outstanding structural economy and performance, steel-reinforced concrete-filled steel tubular stub (SRCFST) columns have become increasingly popular in recent decades. The concept combines the advantages of both materials by using steel reinforcement inside a steel tube filled with concrete. The concrete filling provides additional stiffness and fire resistance, while the steel reinforcement enhances the column’s strength and ductility. This study covers the advantages of concrete-filled steel tubes (CFST) and steel-reinforced concrete-filled steel tubular stub (SRCFST) columns, highlighting their ability to save site space and exhibit high strength. The primary goal of this study is to replace conventional columns with SRCFST columns that have higher ultimate bearing capacities. The work aims to analyze the ultimate load-carrying capacity and axial compressive strength of SRCFST and CFST columns, as well as the failure mechanisms of these structures. An experimental study on the compressive behavior of SRCFST and CFST columns under axial load was conducted. The results show that SRCFST and CFST columns perform well, with the placement of steel reinforcement inside the tube significantly increasing both the ultimate bearing capacity and axial compressive strength.