Optimizing structural performance of concrete-filled steel tubes: The influence of compaction and cross-sectional shape

In this study, the effects of concrete compaction techniques and different cross-sectional shapes (square, rectangular, and circular) on load-carrying capacity are examined in relation to the structural behavior of concrete-filled steel tube (CFT) columns under axial loading. Because of their exceptional strength, ductility, and capacity to absorb energy, CFT columns are being used more and more in contemporary construction, especially in seismically active areas. A thorough literature review, experimental testing of CFT specimens using various concrete grades (M20, M30, and M40), and comparison of the findings with current design codes (AISC, ACI, and EC4) are all included in the study. The main conclusions show that compacted CFT columns can support loads much higher than their non-compacted counterparts, with circular sections outperforming square and rectangular ones. The study emphasizes how crucial concrete compaction is to improving the performance of CFT columns and offers suggestions for additional research, such as investigating the effects of eccentric loading and using finite element analysis to enhance structural modeling.