Accidental　fires　in　aged　concrete　structures　can　lead　to　combined　damage　from　corrosion　and　fire.　In　this　study,　we　aimed　to　explore　the　effects　of　corrosion　and　high　temperature　on　the　residual　mechanical　properties　of　hot-rolled　plain　and　ribbed　bars.　The　results　indicated　that　the　corroded　steel　bars　still　exhibited　ductile　failure　after　high-temperature　exposure.　Moreover,　the　combined　action　of　high　temperature　and　corrosion　has　little　effect　on　the　elastic　modulus.　The　residual　bearing　capacity　of　the　hot-rolled　steel　bar　became　smaller　under　the　condition　of　temperatures　above　600　degrees　C.　When　the　temperatures　experienced　by　the　plain　and　ribbed　steel　bars　were　less　than　600　degrees　C　and　500　degrees　C,　respectively,　the　high　temperature　accelerated　the　decrease　in　the　nominal　yield　and　ultimate　strength.　However,　the　yield　and　ultimate　strengths　based　on　the　minimum　cross-sectional　area　remained　unchanged　with　an　increase　in　the　cross-sectional　loss　ratio.　Similar　to　that　at　room　temperature,　the　ultimate　strain　of　steel　bars　subjected　to　high-temperature　exposure　decreased　exponentially　with　an　increase　in　the　cross-sectional　loss　ratio.　The　new　findings　of　this　study　can　provide　a　theoretical　basis　for　the　safety　assessment　of　aged　reinforced　concrete　structures　after　exposure　to　fire.