This　paper　describes　a　series　of　new　compression　and　bending　tests　carried　out　on　concrete　filled　steel　tubes　(CFST)　after　exposure　to　the　ISO-834　standard　fire.　A　theoretical　model　that　has　been　previously　developed　is　used　to　predict　the　post-fire　load　versus　deformation　relationships　of　CFST　stub　columns　and　beams.　The　predicted　curves　of　load　versus　deformation　are　in　good　agreement　with　the　new　test　results.　The　previously　developed　theoretical　model　had　been　used　to　investigate　the　influence　of　a　number　of　important　parameters　on　the　residual　ultimate　strength　and　flexural　stiffness　of　the　composite　sections　and　the　results　of　the　parametric　studies　were　used　to　develop　formulas　for　calculating　the　composite　section　residual　ultimate　strength　under　axial　compression　or　flexural　bending　and　the　composite　section　residual　flexural　bending　stiffness.　In　these　formulas,　the　ambient　temperature　compression　resistance,　bending　moment　capacity　and　initial　flexural　bending　stiffness　of　the　composite　section　should　be　calculated　using　an　existing　design　code.　In　this　paper,　these　formulas　are　applied　to　the　new　test　data　to　assess　the　suitability　of　using　several　different　design　codes:　AIJ-1997,　AISC-LRFD-1999,　BS5400-1979,　DBJ13-51-2003　and　EC4-1994.　©　2005　Elsevier　Ltd.　All　rights　reserved.