This　paper　presents　the　experimental　results　of　monotonic　axial　compression　tests　on　eighteen　glass　fiber-reinforced　polymer　(FRP)-concrete-steel　double-skin　tubular　stub　columns　(DSTCs)　with　a　rectangular　outer　glass　FRP　tube　and　an　elliptical/rectangular　inner　steel　tube,　as　well　as　eight　rectangular　glass　FRP-confined　hollow　stub　columns　(FCHCs)　with　an　elliptical　inner　void.　The　effects　of　cross-sectional　aspect　ratio,　FRP　thickness,　void　area　ratio　and　the　shape　of　inner　steel　tube　(i.e.,　elliptical　and　rectangular)　on　the　axial　compressive　behavior　of　confined　concrete　core　in　rectangular　DSTCs　are　considered　and　analyzed.　The　test　results　demonstrate　that　rectangular　DSTCs　possess　excellent　bearing　capacity　and　ductility.　Additionally,　the　axial　stress-strain　curves　of　confined　concrete　core　in　rectangular　DSTCs　are　approximately　trilinear　and　show　obvious　post-peak　softening　phenomenon　because　of　the　non-uniform　and　insufficient　confinement.　Furthermore,　the　larger　aspect　ratio,　the　thicker　FRP　tube,　the　higher　void　area　ratio,　as　well　as　elliptical　inner　steel　tube　(compared　with　rectangular)　have　positive　confinement　effect　on　the　axial　compressive　behavior　of　confined　concrete　core　in　rectangular　DSTCs.　Based　on　the　analysis　of　experimental　data,　a　design-oriented　three-stage　stress-strain　model　(considering　post-peak　softening　behavior)　of　confined　concrete　in　rectangular　DSTCs　with　elliptical　inner　steel　tube　is　proposed.　Through　the　comparison,　it　is　found　that　the　predictions　calculated　by　the　proposed　model　accord　well　with　the　experimental　results.　©　2022　Elsevier　Ltd