This　study　evaluated　the　static　bearing　performance　of　partially　corrosion-damaged　reinforced　concrete　(RC)　beams　and　columns　strengthened　with　polyethylene　terephthalate　(PET)　composites.　According　to　the　electrochemical　corrosion　method,　the　corrosion　rate　of　reinforcements　in　the　key　regions　of　columns　and　beams　were　designed　as　15%,　which　conformed　to　the　actual　situations　of　the　non-uniformly　corroded　steel　bars　in　the　RC　structures.　After　that,　the　partially　corroded　RC　columns　and　beams　were　strengthened　with　PET　composites.　Specimens　strengthened　with　carbon　fiber　reinforced　plastic　(CFRP)　and　without　strengthening　worked　as　the　control　groups.　SEM　studies　showed　that　the　good　interface　bonding　performance　between　PET　and　concrete　ensured　the　excellent　integrity　of　PET-strengthened　structures.　Experimental　results　showed　that　the　ductility　and　bearing　capacity　of　columns　and　beams　got　greatly　decreased　due　to　the　corrosion　of　reinforcements,　and　PET　composites　could　effectively　repair　the　damagement　caused　by　corroded　steel　bars.　The　ductility　improvement　by　PET　composites　was　better　than　that　of　CFRP.　For　axial　compression,　the　ductility　index　of　CP-0　column　improved　by　334.62%　compared　to　that　of　CF-0　column.　Similar　to　the　corroded　RC　columns,　the　ductility　index　of　CP-15　column　improved　by　127.49%　than　that　of　CF-15　column.　A　calculated　model　was　proposed　to　predicate　the　stress-strain　relationship　of　PET　composites　strengthened　partially　corroded　RC　columns　accurately.　For　flexure,　PET　and　CFRP　composites　strengthened　beams　had　the　same　ultimate　bearing　capacity.　Meanwhile,　PET　composites　could　better　ensure　the　ductility　of　partially　corroded　RC　beams　than　that　of　CFRP.　Compared　to　BF-0　beam,　the　ductility　index　of　BP-0　beam　increased　by　93.75%.　Compared　to　BF-15　beam,　the　ductility　index　of　BP-15　increased　by　69.23%.　In　the　compression　and　flexure　tests,　the　rupture　strain　of　PET　composites　improved　by　114.82%similar　to　164.11%　than　that　of　CFRP,　which　took　full　advantage　of　the　high　deformation　property　of　PET　composites.　The　study　therefore　concludes　that　PET　composites　is　a　suitable　material　for　external　strengthening　of　partially　corroded　RC　structures.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.