Large　rupture　strain　fiber-reinforced　polymers　(LRS　FRPs)　(e.g.,　with　an　elongation　larger　than　5%)　provide　ideal　confinement　for　seismic　retrofit　of　concrete　columns.　Most　of　existing　design-oriented　models　for　FRP-confined　concrete　define　the　slope　of　axial　stress-strain　curve　(i.e.,　axial　stiffness)　as　a　function　of　FRP＇s　rupture　strain.　Consequently,　concrete　confined　with　FRP　of　the　same　jacket　stiffness　but　different　rupture　strains　usually　lead　to　different　axial　stiffnesses,　which　is　contrary　to　the　experimental　observations.　For　LRS　FRP-confined　concrete　a　slight　deviation　in　the　axial　stiffness　might　cause　significant　error　in　predicting　its　ultimate　state.　Therefore,　a　design-oriented　model　is　developed　here　to　define　axial　stiffness　using　the　jacket　stiffness　rather　than　its　rupture　strain.　26　LRS　FRP-confined　circular　concrete　cylinders　are　tested　and　added　to　a　database　of　36　existing　specimens.　Then　an　existing　lateral-to-axial　strain　(dilation)　relationship　is　upgraded　based　on　the　above　database　and　a　database　on　113　conventional　FRP-confined　concrete　cylinders.　A　three-fold　approach　is　employed　to　define　the　full-range　stress-strain　relation　of　LRS　FRP-confined　concrete　as　a　function　of　jacket　stiffness.　The　proposed　stiffness-based　design-oriented　model　predicts　both　softening　and　hardening　behaviors　and　is　applicable　to　both　conventional　and　LRS　FRP-confined　concrete　columns.