The　steel　ring　restrainer　(SRR)　is　a　novel　device　for　bridges,　the　use　of　which　has　emerged　in　recent　years　to　prevent　the　occurrence　of　unseating　damage.　However,　since　the　restrainer　is　usually　installed　in　regions　with　harsh　atmospheric　corrosive　environment,　it　is　easily　corroded.　To　investigate　the　mechanical　performance　of　SRRs　with　corrosion　damage,　corrosion　patterns　of　SRRs　under　atmospheric　corrosive　environment　were　analysed,　four　corroded　SRR　specimens　were　fabricated　and　subjected　to　monotonic　load　testing.　Based　on　the　experimental　results,　the　validity　of　an　associated　finite　element　(FE)　model　was　verified.　Then,　756　FE　models　of　SRRs　with　general,　and　local　corrosion　damage　were　established　to　supplement　the　test　results.　The　experimental　and　analytical　results　show　that　the　general　corrosion　can　decrease　the　ultimate　strength,　initial　stiffness,　and　secondary　stiffness　of　SRRs,　and　the　local　corrosion　can　also　affect　the　ultimate　strength　of　SRRs.　On　the　other　hand,　general　corrosion　has　little　influence　on　the　variation　tendency　of　force-displacement　curve　and　failure　modes　of　SRRs,　while　the　failure　modes　of　SRRs　with　local　corrosion　are　significantly　affected　by　the　local　corrosion　rate　and　regions　of　local　corrosion.　Finally,　based　on　the　results　of　experimental　and　numerical　simulation,　formulae　for　estimating　the　ultimate　strength　and　ultimate　displacement　of　SRRs　with　corrosion　damage　were　derived.