There　is　a　growing　interest　in　recycled　aggregate　concrete　(RAC)　as　a　green　material.　This　study　investigated　the　stress-strain　behavior　of　high-strength　RAC　through　36　uniaxial　compression　tests.　The　effects　of　recycled　coarse　aggregate　(RCA)　replacement　ratio,　concrete　strength,　steel　fiber　content　and　stirrup　volume　ratio　on　the　failure　mode　and　mechanical　behaviors　of　the　specimen　were　investigated.　The　failure　mode　and　stress-strain　curve　of　RAC　specimens　were　similar　to　those　of　normal　aggregate　concrete　(NAC)　specimens.　The　failure　process　of　the　specimens　was　decelerated　and　the　compression　damage　of　concrete　was　reduced　after　incorporation　of　steel　fibers.　As　the　RCA　replacement　ratio　increased,　the　elastic　modulus　and　ultimate　strain　of　specimens　decreased,　while　the　peak　strain　increased.　Increasing　the　concrete　strength　could　significantly　improve　the　elastic　modulus　of　the　RAC,　but　would　result　in　a　decrease　in　the　ultimate　strain.　The　configuration　of　steel　fibers,　stirrups,　or　both　could　improve　the　peak　strain　and　ultimate　strain　of　RAC,　making　the　compressive　behavior　of　RAC　similar　to　that　of　NAC.　Based　on　the　test　results,　the　unified　models　applicable　to　predicting　the　stress-strain　relationship　of　high-strength　steel　fiber　RAC　confined　by　stirrups　were　proposed.　It　is　expected　to　provide　theoretical　basis　and　data　support　for　numerical　simulation　analysis　of　RAC　structures.　©　2024　Institution　of　Structural　Engineers