In　a　previous　study,　17　rectangular　concrete-filled　steel　tubular　columns　were　tested　using　a　push-out　test　method　to　examine　the　interfacial　bond　behaviour.　In　this　study,　these　specimens　were　subjected　to　axial　compressive　tests　to　study　the　effects　of　interfacial　damage　on　the　ultimate　axial　compressive　capacity.　The　variations　in　both　the　load-axial　displacement　curves　and　load-strain　curves　were　recorded　and　then　compared　to　study　the　influences　of　both　the　steel　tube　fabrication　method　and　the　D/B　ratio　on　the　axial　load-carrying　capacity.　The　axial　compressive　behaviour　of　rectangular　concrete-filled　steel　tubular　columns　with　no　interfacial　damage　was　then　studied　using　a　numerical　analysis　method.　The　contact　stress　distribution　along　the　length　and　width　of　the　face　and　at　the　height　of　the　interface　was　obtained　and　discussed.　In　addition,　the　ultimate　axial　compressive　capacity　of　rectangular　concrete-filled　steel　tubular　columns　with　no　interfacial　damage　was　calculated　using　the　formulas　from　three　international　codes.　The　influence　of　interfacial　damage　on　the　axial　compressive　bearing　capacity　of　a　rectangular　concrete-filled　steel　tubular　column　was　discussed　through　a　comparison　of　the　results　of　the　numerical　simulation,　formula　calculation　and　experiments.　The　influence　of　the　interfacial　gaps　caused　by　the　push-out　tests　on　the　axial　bearing　capacity　of　the　concrete-filled　steel　tubular　columns　can　be　ignored,　because　the　core　concrete　was　not　destroyed　and　the　outside　steel　tube　can　provide　a　sufficient　constraint　force　on　the　concrete　when　the　two　materials　yielded.　Finally,　the　influences　of　the　gap　type　and　size　on　the　bearing　capacity　were　discussed.