This　paper　investigated　the　bond-slip　behavior　of　circular　seawater　sea-sand　concrete　encased　weathering　steel　(CSSCEWS)　structures　after　chloride-induced　corrosion.　Electrochemical　corrosion　tests　and　push-out　tests　were　conducted　on　fifteen　designed　CSSCEWS　specimens.　The　results　revealed　that　the　corrosion　ratio　and　steel　section　type　distinctly　influenced　the　interfacial　bond　performance.　Both　the　ultimate　and　residual　bond　strengths　decreased　with　the　increase　of　the　corrosion　ratio,　and　the　decline　rate　slowed　down　gradually.　Compared　to　the　uncorroded　specimens,　the　average　damage　ratio　of　the　ultimate　strength　of　the　specimens　with　a　corrosion　ratio　of　8%　is　25.9%,　while　the　average　damage　ratio　of　the　residual　strength　is　49.1%.　The　bond　toughness　continuously　decreased　with　prolonged　corrosion,　while　the　bond　stiffness　and　energy　dissipation　index　first　increased　and　then　decreased.　Additionally,　formulas　for　calculating　the　corroded　bond　strengths　of　CSSCEWS　specimens　were　proposed.　Considering　the　strength　damage　due　to　corrosion　and　the　stiffness　damage　due　to　slip,　a　three-stage　bond-slip　constitutive　model　was　proposed.　Finally,　this　model　was　applied　to　the　nonlinear　spring　elements　in　finite　element　modeling　to　effectively　simulate　the　interfacial　bond　behavior　during　the　loading　of　corroded　CSSCEWS　specimens.　©　2024　Elsevier　Ltd