Torsional　behavior　tests　and　a　theoretical　analysis　were　conducted　on　the　composite　girders　with　corrugated　steel　webs　and　concrete-filled　steel　tubular　(CSW-CFST)　truss　chords.　Their　performance　was　compared　with　that　of　composite　girders　with　circular　hollow　section　(CSW-CHS)　truss　chords　and　composite　box　girders　with　CSW-CFST　chords.　The　study　revealed　the　influence　of　the　concrete　in　the　chord　and　the　sectional　form　of　the　composite　girders　on　their　twist　failure　mode　and　torsional　behavior.　The　test　results　showed　that　the　sectional　form　of　composite　girders　with　CSW-CFST　truss　chords　can　perform　as　well　as　closed　box　cross-sections.　The　point　of　twist　failure　was　found　to　be　when　the　concrete　roof　obliquely　cracked　with　an　angle　of　45　degrees　between　the　crack　and　the　girder　axis　and　the　rebar　had　already　yielded.　The　concrete　in　the　chord　contributes　to　the　torsional　stiffness　and　bearing　capacity　of　composite　girders.　The　paper　puts　forward　a　method　for　calculating　the　compound　stiffness　of　CFST　specimens　by　superposing　their　linear　stiffness.　Then,　on　the　basis　of　the　four　types　of　twist　failure　that　can　affect　composite　girders　with　CSW-CFST　truss　chords,　a　method　for　calculating　their　torsional　bearing　capacity　is　proposed.　The　deviation　between　the　results　acquired　using　the　proposed　method　and　the　results　from　the　tests　and　a　finite　element　analysis　is　less　than　8.5%.