To　study　the　axial　compressive　behaviour　of　circular　steel　reinforced　concrete-filled　stainless　steel　tubular　(SRCFSST)　stub　columns,　axial　compression　tests　on　ten　circular　SRCFSST　stub　columns　and　two　circular　concrete-filled　stainless　steel　tubular　(CFSST)　stub　columns　were　carried　out.　The　finite　element　model　(FEM)　was　established,　and　force　mechanism　analysis　and　parametric　analysis　were　carried　out.　The　test　results　show　that　the　load-bearing　capacity　and　ductility　factor　of　the　circular　CFSST　column　increase　by　an　average　of　24%　and　80.　3%,　respectively,　after　the　installation　of　the　profiled　steel.　The　maximum　confining　stress　of　the　profiled　steel　exceeds　that　of　the　stainless　steel　tube　when　the　peak　load　is　applied.　The　parametric　analysis　results　show　that　the　load-carrying　capacity　of　the　circular　SRCFSST　column　increases　with　the　increase　of　material　strength　and　steel　contents　of　steel　tube　and　profile　steel,　the　maximum　improvement　ranges　from　36.1%　to　81.94%.　Its　peak　strain　increases　with　the　increase　of　steel　strength,　steel　content　of　steel　tube,　with　the　maximum　improvement　ranging　from　28.33%　to　136.09%.　Its　axial　compressive　stiffness　increases　with　the　increase　of　concrete　strength,　steel　content　of　steel　tube　and　steel　content　of　profiled　steel,　with　the　maximum　improvement　ranging　from　27.89%　to　49.1%.　The　simplified　models　of　axial　compressive　load　capacity,　peak　strain　and　combined　stiffness　of　the　circular　SRCFSST　column　were　proposed,　and　the　simplified　calculated　values　are　in　good　agreement　with　the　FE　or　measured　results.　©　2024　Science　Press.　All　rights　reserved.