To　obtain　superior　corrosion　resistance　and　impact　resistance,　as　well　as　good　economic　benefits,　two　new　types　of　composite　structure　called　as　steel　tube　internally-reinforced　concrete-filled　weathering　steel　tube　(STRCFWST)　and　steel　spiral　internally-reinforced　concrete-filled　weathering　steel　(SSRCFWST)　columns　are　proposed　and　compared　in　terms　of　their　impact　resistance　in　this　paper.　Eleven　impact　tests　were　conducted　and　three　parameters　comprising　steel　spiral　diameter,　wall　thicknesses　of　outer　and　inner　steel　tube　were　considered　to　evaluate　their　influences　on　the　lateral　impact　behaviors.　Results　show　the　presence　of　inner　steel　tube　and　reinforcement　cage　significantly　enhances　the　impact　resistance　while　slightly　decreases　the　energy　absorption　capacity.　Increasing　inner　steel　tube　wall　thickness　helps　to　improve　the　impact　resistance,　however　the　contribution　is　not　so　good　as　that　produced　by　increasing　the　outer　steel　tube　wall　thickness,　whilst　varying　steel　spiral　diameter　almost　has　no　impact.　Numerical　models　were　developed　by　ABAQUS/Explicit　and　verified　via　the　test,　based　on　which　the　full-range　behaviors　of　STRCFWST,　SSRCFWST　and　unreinforced　concrete-filled　weathering　steel　tube　(CFWST)　columns　under　impact　loading　were　compared　and　discussed.　It　is　demonstrated　that　steel　tube　and　reinforcement　cage　provide　little　confinement　on　concrete　infill　under　impact.　With　the　same　internal　steel　ratio,　inner　steel　tube　makes　a　greater　contribution　to　sectional　bending　moment　resistance　and　energy　absorption　as　compared　to　the　reinforcement　cage.　©　2024