Strength of concrete filled steel box columns incorporating interaction buckling

Concrete filled steel columns have seen an increased usage in building structures throughout the world. In Australia, the use of thin-walled steel sections coupled with concrete infill has been used on various building projects with great advantage. The major advantages of the use of thin-walled steel sections are the reduced structural steel costs and the economy in construction that the method provides. This paper presents both an experimental and theoretical treatment of coupled local and global buckling of concrete filled steel columns sometimes termed interaction buckling. The paper then concludes with comparisons of design recommendations for the strength evaluation of slender composite columns with thin-walled steel sections.