The　target　of　the　current　works　is　to　analyze　the　impact　of　shear-span　ratio　on　the　shear　failure　of　Carbon　Fiber　Reinforced　Polymers　(CFRP)　wrapped　reinforced　concrete　beams　having　different　depths.　Twenty-four　simply　supported　beams　with　different　structure　sizes　(the　maximum　beam　depth　reaching　1200　mm)　and　distinct　Shear　span　to　effective　depth　ratios　of　1.0,　1.5,　and　2.0,　under　the　CFRP　ratio　ρf　of　0%　and　0.0835%　were　designed　and　tested.　In　the　experiment,　the　shear　failure　process　and　failure　pattern　of　beams　are　presented　in　detail.　The　strain　distribution　of　the　CFRP　sheets　is　described　clearly　as　well.　In　addition,　the　shear　contribution　of　CFRP　with　different　beam　sizes,　especially　large　beams,　and　different　shear　span　to　effective　depth　ratio　ratios　were　evaluated,　besides,　the　calculation　formulas　of　shear　capacity　in　design　specifications　were　analyzed　and　compared.　The　tested　results　indicated　that　all　beams　with　distinct　shear-span　ratios　exhibit　a　visible　size　effect.　As　the　shear　span　to　effective　depth　ratio　increases,　the　generalized　shear　strength　decreases.　In　addition,　the　smaller　the　shear　span　to　effective　depth　ratio　is,　the　smaller　the　shear　contribution　ratio　of　CFRP　is,　manifesting　the　impact　of　CFRP　in　a　larger　shear-span　ratio　is　not　as　good　as　that　of　a　smaller　shear-span　ratio.　Finally,　a　3-D　Meso-scale　finite　element　model　is　founded　to　enhance　the　understanding　of　the　shear　failure　mechanical　response　of　CFRP　shear-strengthened　concrete　beams　without　hooping　under　the　impact　of　a　wide　range　of　shear-span　ratio.　©　2023　Elsevier　Ltd