The　load　versus　deformation　curves　of　steel　tube　confined　concere　members　under　pure　bending　are　carried　out　using　finite　element　analysis.　The　calculated　results　are　verified　by　test　results　from　two　circular　and　two　square　specimens,　and　reasonable　agreement　is　demonstrated.　The　finite　element　analysis　modelling　is　then　used　to　analyze　the　load　versus　deformation　relationships,　and　to　investigate　the　composite　action　between　the　steel　tube　and　concrete　core.　A　simple　formula　for　calculating　the　ultimate　strength　of　the　composite　members　under　pure　bending　is　recommended.