This　paper　presents　the　first　experimental　study　of　the　seismic　performance　of　double-skin　tubular　columns　(DSTCs)　with　polyethylene　naphthalate　(PEN)　FRP　tubes.　Fiber-reinforced　polymer　(FRP)-concrete-steel　DSTC　represents　a　new　type　of　combined　structure.　A　DSTC　has　an　external　FRP　tube　with　an　internal　steel　tube,　and　concrete　fills　the　gap　between　the　two　tubes.　DSTCs　limit　the　outward　buckling　of　their　steel　tubes　and　have　excellent　seismic　performance.　Previous　studies　have　shown　that　glass　FRP　(GFRP)　fracture　controls　the　ultimate　failure　of　DSTCs　with　a　GFRP　tube.　Therefore,　the　fracture　strain　of　the　FRP　tube　is　a　critical　factor　for　DSTCs.　The　fracture　strain　of　large-rupture-strain　(LRS)　FRPs　is　greater　than　5　%,　which　gives　DSTCs　an　advantage.　Six　full-scale　DSTCs　were　tested　in　the　paper　to　investigate　the　effects　of　FRP　type,　PEN　FRP　thickness　and　the　axial　compression　ratio　as　well　as　the　plastic　hinge　region　is　filled　with　concrete　on　the　seismic　performance　of　DSTCs.　The　experimental　results　indicate　that　the　seismic　performance　of　DSTCs　with　PEN　FRP　is　equal　to　or　slightly　better　than　that　of　GFRP,　and　the　energy　dissipation　capacity　improved　by　41.7　%.　In　addition,　decreasing　the　axial　compression　ratio,　increasing　the　thickness　of　PEN　FRP,　and　filling　the　plastic　hinge　region　with　concrete　appropriately　increased　the　DSTC　seismic　performance.　©　2025