Quantification　of　the　critical　collapse　displacement　is　important　to　establish　the　collapse-resistant　design　method　for　the　steel　frame　under　a　column-removal　scenario.　In　this　paper,　the　critical　collapse　displacement　of　steel　frames　due　to　an　interior　column　loss　is　studied.　The　Bai-Wierzbicki　fracture　model　of　steel　is　incorporated　into　ABAQUS　via　user　subroutine,　in　which　the　effects　of　both　stress　triaxiality　and　Lode　angle　on　the　fracture　strain　of　steel　are　considered.　The　effects　of　the　depth,　span,　axial　restraint　and　rotational　restraint　of　the　beam　on　its　critical　collapse　displacement　are　studied.　The　relationships　of　the　critical　collapse　displacement　with　the　depth,　span　and　boundary　conditions　of　the　beam　are　established.　The　reliability　of　the　proposed　method　is　validated　against　the　test　results.　It　is　found　that　the　ratio　of　the　critical　collapse　displacement　to　the　depth　of　the　beam　can　be　expressed　as　a　linear　function　of　the　span-to-depth　ratio　of　the　beam.　The　rotational　restraint　of　the　beam　mainly　affects　the　transition　stage　of　the　resistancedisplacement　curve　of　the　beam　and　it　has　limited　effect　on　the　critical　collapse　displacement　of　the　beam.　The　axial　restraint　mainly　affects　the　catenary　stage　of　the　resistance-displacement　curve　of　the　beam　and　when　the　axial　stiffness　ratio　exceeds　0.01,　the　effect　of　the　rotational　restraint　on　the　critical　collapse　displacement　of　the　beam　can　be　neglected.