This　paper　continues　the　study　of　a　novel　self-centering　prefabricated　steel　beam-column　joint　with　weakened　flange　cover　plates　(WFCP-SCSJ).　The　seismic　performance　and　the　collapse　performance　of　steel　frames　with　WFCP-SCSJs　(WSSF)　were　evaluated　through　numerical　simulations.　A　six-story　steel　moment　resisting　frame　was　designed,　considering　various　configurations　and　joint　arrangements.　Numerical　models　were　established　in　OpenSees,　and　seismic　time-history　analyses　and　incremental　dynamic　analyses　(IDAs)　were　carried　out.　Fragility　curves　were　derived　to　assess　the　collapse　resistance　of　different　structural　systems　from　a　probabilistic　standpoint.　The　results　show　that　steel　frames　with　WFCP-SCSJs　exhibits　superior　seismic　performance　and　self-　centering　capability,　which　meets　the　requirements　in　the　Building　Seismic　Design　Codes.　Arranging　WFCPSCSJs　on　the　inner　side　of　the　structural　plane　and　along　the　weak　axis　effectively　reduces　the　structural　displacement　response.　Conversely,　arranging　WFCP-SCSJs　solely　on　the　first　story　of　the　structure　leads　to　an　abrupt　change　in　structural　stiffness　and　an　increase　in　the　displacement　response.　The　failure　probability　of　WSSF　under　different　limit　states　is　significantly　lower　than　that　of　rigid-connected　steel　frames　(RSF),　and　the　collapse　margin　ratio　(CMR)　of　WSSF　is　higher　than　that　of　RSF,　indicating　an　excellent　anti-collapse　capability　of　the　WSSF.