To　verify　the　applicability　of　the　existing　methods　of　compressive　arch　action　(CAA)　against　progressive　collapse　in　engineering　scale,　a　fully　detailed　numerical　model　of　a　reinforced　concrete　continuous　beam　using　the　finite　element　software　LS-DYNA　was　established.　The　reliability　of　this　model　was　verified　through　existing　experiments.　Nine　full-scale　structural　models　were　then　numerically　modeled　based　on　this　validated　model,　taking　into　account　commonly　used　section　heights,　spans,　and　steel　ratios　in　engineering　practice.　Research　findings　indicate　that　as　the　steel　ratio　increases,　the　enhancing　effect　of　CAA　on　structural　resistance　to　progressive　collapse　gradually　diminishes.　Furthermore,　within　a　span-to-height　ratio　range　of　9　-　12,　there　is　an　increase　in　enhancement　provided　by　CAA　for　resisting　progressive　collapse;　however,　within　a　span-to-height　ratio　range　of　12　-　15,　the　enhancing　effect　diminishes.　©　2024　Beijing　University　of　Technology.　All　rights　reserved.