Reactive　powder　concrete-filled　steel　tube　(RPCFT)　consists　of　rectangular　or　circular　steel　tube　filled　with　reactive　powder　concrete　(RPC).　Currently,　there　is　a　general　lack　of　knowledge　regarding　the　behavior　of　RPCFT　members　subjected　to　axial　tension.　This　paper　addresses　the　knowledge　gap　by　conducting　experimental　tests　on　57　specimens,　including　33　RPCFT　specimens,　21　RPC　specimens,　and　three　hollow　steel　tube　(HSS)　specimens.　The　test　parameters　are　the　diameter-to-thickness　ratio　of　the　steel　tube,　fiber　reinforcement　ratio,　and　curing　temperature.　The　test　results　indicate　that　the　tensile　strength　of　RPCFT　members　increases　with　increasing　fiber　reinforcement　ratios　and　curing　temperatures　or　with　decreasing　diameter-to-thickness　ratios　of　the　steel　tube.　As　compared　to　conventional　concrete-filled　steel　tube　(CFT)　members,　RPCFT　members　have:　(i)　a　similar　tensile　behavior,　i.e.,　the　steel　tube　has　an　increased　tensile　strength　and　does　not　have　any　pinching　due　to　the　interaction　between　the　steel　tube　and　concrete　infill;　and　(ii)　a　higher　tensile　strength　because　RPC　with　fibers　has　a　higher　tensile　strength　than　conventional　concrete　and　can　maintain　its　tensile　capacity　at　large　strains.　This　paper　also　evaluates　the　applicability　of　current　design　equations　for　estimating　the　axial　tensile　strength　of　RPCFT　members.　The　evaluation　indicates　that　the　current　design　equations　are　over-conservative　for　RPCFT　members.　This　paper　then　proposes　a　new　design　equation　for　estimating　the　axial　tensile　strength　of　RPCFT　members.　The　accuracy　of　the　proposed　equation　is　confirmed　by　using　it　to　predict　the　strength　of　the　33　RPCFT　specimens　tested　in　this　research.