Concrete-filled　steel　tubular　(CFST)　hybrid　column　is　a　composite　member　that　incorporates　reinforced　concrete　(RC)　web　plates　at　the　bottom　of　the　column　and　circular　hollow　steel　tube　(CHS)　battens　at　the　upper　segments　to　connect　the　column　limbs.　To　assess　its　seismic　performance,　quasi-static　tests　were　conducted　on　6　CFST　hybrid　column　specimens　with　height　coefficient　of　the　RC　web　(the　ratio　of　web　height　to　column　height)　and　longitudinal　spacing　of　the　column　limbs　as　variables.　The　results　indicate　that　the　CFST　hybrid　column　exhibits　good　seismic　performance　under　low-cycle　repeated　loads　and　the　load-displacement　hysteresis　curves　display　a　complete　shuttle　shape.　The　primary　failure　modes　are　shear　failure　in　the　lattice　section,　local　bulging　deformation　of　the　steel　tube　in　the　plastic　hinge　area　of　the　column　limb,　and　cracking　and　spalling　of　concrete　in　the　stiffness　transition　section　at　the　top　of　the　RC　web.　When　the　height　coefficient　of　the　RC　web　is　altered　from　0.0　to　0.3,　the　plastic　hinge　area　shifts　from　the　bottom　section　to　the　top　of　the　RC　web,　resulting　in　a　53%　increase　in　elastic　stiffness,　a　31%　increase　in　horizontal　peak　load,　and　a　slightly　5%　increase　in　ultimate　displacement　ductility　coefficient.　When　the　height　coefficient　is　changed　from　0.3　to　0.7,　the　plastic　hinge　area　remains　at　the　top　of　the　RC　web,　causing　a　significantly　172%　increase　in　elastic　stiffness　and　a　98%　increase　in　horizontal　peak　load,　as　well　as　a　marked　increase　in　cumulative　hysteretic　energy　dissipation　under　the　same　displacement.　However,　the　ultimate　displacement　ductility　coefficient　decreases　by　about　16%.　Reducing　the　longitudinal　spacing　of　the　column　limbs　from　650　mm　to　250　mm　causes　the　plastic　hinge　area　to　transfer　from　the　top　of　the　RC　web　to　the　bottom　section,　resulting　in　a　change　in　failure　mode　to　overall　buckling　failure,　a　67%　reduction　in　elastic　stiffness　and　a　47%　reduction　in　horizontal　peak　load.　Based　on　the　structural　mechanical　characteristics,　a　calculation　method　for　the　horizontal　bearing　capacity　of　the　CFST　hybrid　column　was　proposed,　and　the　calculated　values　were　found　to　be　in　good　agreement　with　the　experimental　results.　©　2025　Tsinghua　University.　All　rights　reserved.