Structures　may　suffer　from　accidental　impact　loads　during　the　service　life.　While　most　impacts　will　not　destroy　structures　completely,　quantifying　their　residual　behavior　after　impact　is　crucial　for　evaluating　the　damage　and　then　providing　recommendations　for　repair　or　removal.　This　may　greatly　reduce　the　time　and　economic　losses　caused　by　impacts.　Hence,　this　study　experimentally　and　numerically　investigated　the　residual　behavior　of　UHPC-filled　high-strength　steel　tube　(UHPC-FHST)　members　subjected　to　axial　impact.　Parameters　including　impact　energy,　steel　ratio,　specimen　length,　and　steel　grade　(Q690　and　Q355)　were　carefully　considered.　After　tests,　different　failure　modes　and　axial　load-displacement　curves　were　obtained.　The　residual　ratio　(β),　a　ratio　of　the　bearing　capacity　of　a　damaged　specimen　to　that　of　a　specimen　without　impact,　was　employed　to　assess　the　damage　level　of　UHPC-FHST　members　after　axial　impact.　Tests　showed　that　UHPC-FHST　members　have　excellent　axial　impact　resistance,　high　residual　strength,　and　high　residual　ratio,　especially　under　low-energy　impact　conditions.　β　decreases　rapidly　and　linearly　with　increasing　nominal　strain　and　then　stabilizes　after　a　certain　value.　A　finite　element　(FE)　model　was　thereafter　established　and　benchmarked　by　the　available　test　results,　where　two　analysis　steps　were　established　to　continuously　simulate　the　impact　and　residual　compression　processes.　The　FE　results　demonstrated　a　great　agreement　with　the　tests,　which　could　provide　a　reference　for　further　investigations　in　related　studies.　©　2024　Elsevier　Ltd