In　order　to　address　the　issue　of　connecting　beams　and　columns　in　light　steel　composite　structures，a　prefabricated　concrete　roof　structure　system　with　studs　connections　was　proposed．　A　full-scale　prefabricated　recycled　concrete　roof　consisting　of　3　prefabricated　concrete　one-way　slabs　was　designed，which　were　connected　using　the　assembled　self-tapping　nail　set　connection　nodes．Through　out-of-plane　stress　performance　testing，the　damage　process　and　failure　state　of　the　roof　system　were　studied，and　an　analysis　was　conducted　on　its　deformation　capacity，load　carrying　capacity，stiffness，and　strain　characteristics．　ABAQUS　finite　element　calculation　software　was　utilized　to　analyze　different　working　conditions．　The　results　demonstrate　that　the　prefabricated　concrete　roof　exhibits　excellent　external　force　performance　and　effectively　connects　with　the　light　steel　composite　frame　through　studs．The　assembled　self-tapping　nail　sets　ensure　reliable　connection　between　the　plates　while　enabling　bidirectional　loading　on　the　roof．Furthermore，ABAQUS　calculations　indicate　that　increasing　the　number　of　self-tapping　nail　sets，reinforcing　ratio　of　the　roof，number　of　studs　and　increase　the　thickness　of　the　floor　slab　can　enhance　its　bearing　capacity　and　stiffness　to　some　extent．　©　2025　Huazhong　University　of　Science　and　Technology.　All　rights　reserved.