Extensive　experimental　and　theoretical　studies　have　been　conducted　on　the　compressive　strength　of　concrete-filled　steel　tubular　(CFST)　columns,　but　little　attention　has　been　paid　to　their　compressive　stiffness　and　deformation　capacity.　Despite　this,　strength　prediction　approaches　in　existing　design　codes　still　have　various　limitations.　A　finite　element　model,　which　was　previously　proposed　by　the　authors　and　verified　using　a　large　amount　of　experimental　data,　is　used　in　this　paper　to　generate　simulation　data　covering　a　wide　range　of　parameters　for　circular　and　rectangular　CFST　stub　columns　under　axial　Compression.　Regression　analysis　is　conducted　to　propose　simplified　models　to　predict　the　compressive　strength,　the　compressive　stiffness,　and　the　compressive　strain　corresponding　to　the　compressive　strength　(ductility)　for　the　composite　columns.　Based　on　the　new　strength　prediction　model,　the　capacity　reduction　factors　for　the　steel　and　concrete　materials　are　recalibrated　to　achieve　a　target　reliability　index　of　3.04　when　considering　resistance　effect　only.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.