To　evaluate　the　seismic　performance　of　large　rupture　strain　fiber　reinforced　polymer　(LRS　FRP)-reinforced　bridges　under　earthquake　action,　this　paper　takes　a　typical　three-span　continuous　girder　bridge　as　the　analytical　model.　There　are　few　studies　on　LRS　FRP-confined　concrete　models　under　cyclic　axial　compression,　which　limits　the　seismic　analysis　of　LRS　FRP-reinforced　bridges.　Therefore,　the　simplified　LRS　FRP-confined　concrete　model　under　cyclic　axial　compression　proposed　by　the　authors＇　research　group　was　introduced.　According　to　the　simplified　model,　the　seismic　fragility　of　the　continuous　girder　bridge　before　and　after　LRS　FRP　strengthening　was　analyzed　based　on　the　seismic　fragility　analysis　theory　and　incremental　dynamic　analysis　(IDA)　method　using　OpenSees　platform.　Results　show　that　the　bridge　columns　were　mainly　in　an　undamaged　linear　elastic　state　under　slight　damage　and　moderate　damage,　and　LRS　FRP　reinforcement　had　little　effect　on　the　seismic　fragility.　In　extensive　damage　and　complete　collapse　states,　the　exceedance　probability　of　damage　of　unreinforced　bridge　was　significantly　greater　than　that　of　LRS　FRP-reinforced　bridge.　The　proposed　simplified　LRS　FRP-confined　concrete　model　can　provide　reference　for　seismic　analysis　of　LRS　FRP-reinforced　bridges.　©　2023　Harbin　Institute　of　Technology.　All　rights　reserved.