Corroded　steel　reinforced　concrete　(CSRC)　structures　in　coastal　environments　face　a　serious　durability　issue.　This　paper　investigated　the　axial　compressive　performance　of　CSRC　columns　experimentally.　Twelve　CSRC　columns　with　different　corrosion　ratios　and　slenderness　ratios　were　designed　and　subjected　to　electrochemical　corrosion　tests　and　axially　loaded　tests　to　reveal　their　failure　mode　and　performance　deterioration　laws.　The　test　results　revealed　that　the　ultimate　bearing　capacity　and　stiffness　of　CSRC　specimens　decreased　significantly,　while　the　ductility　index　decreased　slightly,　with　increasing　corrosion　ratio　and　slenderness　ratio.　Furthermore,　comparisons　were　made　between　the　experimental　results　of　the　ultimate　bearing　capacity　of　CSRC　columns　and　the　calculated　results　from　three　different　design　methods　(Eurocode　4,　JGJ　138–2016,　and　ANSI/AISC　360–22).　A　modified　design　formula　was　derived　theoretically　for　the　ultimate　bearing　capacity　of　CSRC　columns,　based　on　Eurocode　4,　considering　the　cracking　and　confinement　effects　after　corrosion.　Finally,　a　new　finite　element　modeling　method　for　simulating　CSRC　columns　was　proposed,　and　different　finite　element　models　considering　different　effects　were　compared　to　further　verify　the　rationality　and　necessity　of　considering　both　effects　simultaneously　in　the　modified　bearing　capacity　calculation　formula.　©　2023