Concrete-filled　steel　tube　(CFT)-RC　composite　members　consist　of　multiple　CFT　columns　connected　by　RC　plates　or　webs.　CFT-RC　composite　members　have　been　used　in　different　types　of　structures,　for　example,　as　ribs　in　long-span　arch　bridges　and　as　tall　piers　supporting　long-span　bridges.　However,　there　is　limited　knowledge　regarding　their　fundamental　axial　load-displacement　behavior,　and　a　general　lack　of　behavior-based　design　equations　for　estimating　their　axial　compressive　strength.　This　paper　addresses　these　knowledge　gaps　by　presenting　experimental　results　from　axial　loading　tests　conducted　on　14　short　(stub)　column　specimens.　These　include　seven　CFT-RC　columns,　four　CFT　columns,　and　three　RC　plates.　The　parameters　included　in　the　tests　are　the　thickness　of　the　steel　tube　wall　(t(s))　and　RC　plates　(t(p)).　An　experimental　database　of　104　CFT　column　tests　conducted　around　the　world　is　also　compiled.　The　experimental　results　from　the　tests　conducted　in　this　research　are　combined　with　those　from　the　compiled　database　and　used　together　to　develop　behavior-based　design　equations　for　estimating　the　axial　compressive　strength　of　short　CFT-RC　columns.　(C)　2017　American　Society　of　Civil　Engineers.