CFST–RC　pier　is　a　modified　form　of　CFST　latticed　column　in　which　the　main　longitudinal　limbs　are　connected　with　RC-web　instead　of　steel　tube　lacings.　This　type　of　pier　is　constructed　in　tall　bridges　in　seismic　prone　zones.　RC-web　increases　the　stiffness　of　columns,　hence　reducing　the　slenderness　ratio　for　long　columns.　In　this　paper,　an　attempt　has　been　made　to　obtain　seismic　performance　characteristics　of　CFST–RC　columns　with　variable　widths　of　RC-web.　Three　CFST–RC　piers　with　variable　widths　of　RC-web　were　tested　in　the　laboratory.　Cyclic　load　test　was　performed　to　know　the　seismic　behavior　of　this　type　of　column.　Under　cyclic　loading,　the　seismic　performance　of　CFST–RC　piers,　such　as　failure　modes,　ductility,　load　displacement　hysteretic　curves,　energy　absorption　capacity,　strength　and　stiffness　degradation　have　been　studied.　The　results　showed　that　the　lateral　load-carrying　capacity　and　energy　dissipation　capacity　of　the　columns　increased　with　the　increase　in　the　width　of　RC-web,　while　the　ductility　decreased.　Cracks　in　the　RC-web　and　the　tearing　of　steel　tube　at　the　base　of　the　piers　were　the　main　failure　modes　of　the　CFST–RC　piers.　©　2019,　Shiraz　University.