The　rehabilitation　of　reinforced　concrete　(RC)　bridge　columns　subjected　to　chloride-induced　corrosion　is　addressed　in　the　present　paper.　The　proposed　strategy　is　based　on　the　replacement　of　the　original　external　layer　made　of　normal-strength　concrete　(NSC)　with　ultra-high　performance　fiber　reinforced　concrete　(UHPFRC),　and　it　additionally　involves　the　substitution　of　the　existing　corroded　longitudinal　reinforcement　with　new　machined　steel　rebars.　This　repair　technique　aims　at　restoring　strength,　stiffness,　and　ductility　of　the　original　column　in　a　short　time　without　altering　its　cross-section　dimensions.　Because　of　the　high　compactness　of　the　UHPFRC,　it　also　serves　at　improving　its　durability.　The　main　contribution　of　the　present　work　is　a　numerical　investigation　carried　out　in　order　to　identify　how　the　design　decisions　about　the　repair　strategy　influence　the　behavior　of　the　restored　column.　The　parametric　investigation　reveals　that　the　length　of　the　zone　in　which　NSC　is　replaced　by　UHPFRC　as　well　as　the　machined　index　(i.e.,　ratio　between　turned　and　original　rebar　cross-section　area)　must　be　properly　selected　to　make　the　intervention　effective.　Numerical　results　also　highlight　that　the　main　design　issue　to　deal　with　is　the　relocation　of　the　plastic　hinge　from　the　repaired　zone　towards　the　weak　unrepaired　part　of　the　column.　Practical　design　recommendations　are　finally　formulated.　©　2022　The　Authors.　Structural　Concrete　published　by　John　Wiley　&　Sons　Ltd　on　behalf　of　International　Federation　for　Structural　Concrete.