Accurate　finite　element　analysis　(FEA)　depends　on　the　accurate　definition　of　materials.　The　definition　of　material　properties　of　large-rupture-strain　fiber　reinforced　polymer　(LRS　FRP)　in　the　fiber　direction　is　realized　by　writing　the　user　subroutine　UMAT.　Based　on　the　theoretical　framework　of　the　concrete　damaged　plasticity　model　in　Abaqus,　a　modified　concrete　damaged　plasticity　model　is　proposed　to　define　the　material　properties　of　LRS　FRP-confined　concrete.　These　modifications　include:　the　parameter　K　related　to　the　yield　criterion　is　calibrated　by　the　test　data　of　LRS　FRP-confined　concrete;　the　hardening/softening　criterion　is　related　to　the　confinement　stiffness;　the　flow　rule　is　related　to　axial　plastic　strain.　The　modified　material　model　is　used　for　FEA.　The　results　show　that　the　stress-strain　curve　predicted　by　FEA　is　consistent　with　the　test　results.　Based　on　the　FEA　results,　the　non-uniform　of　stress　distribution　on　the　rectangular　column　section　is　discussed,　which　can　be　divided　into　effective　confinement　area　and　weak　confinement　area　according　to　the　confinement　effect,　and　the　non-uniform　stress　distribution　in　the　effective　confinement　area　increases　with　the　increase　of　section　ratio　(the　ratio　of　long　side　to　short　side).　©　2023　Tsinghua　University.　All　rights　reserved.