In　this　study,　the　influence　of　corrosion　on　the　monotonic　properties　of　ultra-high-strength　(UHS,　yield　strength　above　1000　MPa)　reinforcing　bars　are　investigated　through　tensile　and　compressive　tests.　The　accelerated　corrosion　technique　is　adopted　to　obtain　corroded　UHS　steel　bars　with　different　corrosion　degrees.　A　total　number　of　79　specimens　are　involved　in　the　experiment　(16　for　tensile　test　and　63　for　compressive　test).　The　influences　of　corrosion　on　the　tensile　and　compressive　properties　of　UHS　steel　bars　are　quantified　through　regressions　of　experimental　results.　An　empirical　stress-strain　curve　model　for　UHS　steel　bars　is　proposed　based　on　the　experimental　results.　This　model　can　well　reproduce　the　monotonic　behaviors　of　UHS　steel　bars　and　can　take　the　influence　of　corrosion　into　account,　which　can　be　easily　implemented　in　the　load-carrying　capacity　analysis　of　corroded　RC　structures　designed　with　UHS　steel　bars.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.