To　solve　the　problems　of　easy　rusting　of　assembled　segmental　pier　reinforcements　in　coastal　erosion　environments　and　large　residual　displacements　of　bridge　piers　after　strong　earthquakes,　hybrid　reinforced　precast　segmental　assembled　concrete　piers　with　stainless　steel　reinforcement　and　unbonded　prestressed　glass　fiber-reinforced　polymer　(GFRP)　bars　are　proposed.　The　damage　modes　of　the　hybrid-reinforced　piers　were　revealed　through　the　proposed　static　tests.　In　addition,　the　seismic　performance　parameters　including　hysteresis　performance,　bearing　capacity,　energy　dissipation,　residual　displacement,　prestressing　change,　stiffness　degradation,　rebar　strain,　and　joint　opening　of　the　piers　were　analyzed　and　compared　with　the　seismic　performance　of　the　hybrid-reinforced　segmental-assembled　piers　with　bonded　non-initial　prestressed　GFRP　tendons.　The　results　show　that　the　unbonded　GFRP　reinforcement　applied　50%　of　the　vertical　axial　compression　ratio　of　the　top　of　the　pier　preload,　and　the　residual　displacement　of　the　specimen　could　be　reduced　by　nearly　40%;　however,　the　peak　bearing　capacity　was　reduced　by　approximately　20%.　With　an　increase　in　the　reinforcement　rate　of　the　GFRP　reinforcement　and　a　reduction　in　the　reinforcement　rate　of　the　stainless-steel　reinforcement,　the　residual　displacement　of　the　specimen　was　reduced　by　38%,　and　the　bearing　capacity　was　reduced　by　10%.　The　vertical　axial　pressure　ratio　at　the　top　of　the　pier,　i.e.,　the　effect　of　P-Δ　effect　on　the　maximum　bending　moment　at　the　bottom　of　the　pier,　is　more　apparent.　With　sufficient　initial　tensile　force　and　reinforcement　rate　of　unbonded　prestressed　GFRP　tendons,　while　considering　the　influence　of　the　ultimate　tensile　strain　of　GFRP　tendons,　the　same　horizontal　bearing　capacity　as　the　bonded　case　can　be　achieved,　but　the　residual　displacement　of　the　pier　column　can　significantly　reduce.　©　2025　Chang＇an　University.　All　rights　reserved.