Recently,　seismic　resilience　has　become　a　research　frontier　in　civil　engineering.　The　self-centering　steel　frame　can　effectively　control　structural　damage　and　reduce　structural　residual　deformation,　which　ensures　rapid　repair　after　an　earthquake.　Therefore,　such　a　structural　system　has　attracted　extensive　attention　from　researchers.　One　of　the　important　research　directions　on　self-centering　steel　frames　is　the　development　of　high-performance　energy-dissipating　components.　A　new　type　of　dual-functional　replaceable　stiffening　angle　steel　(SAS)　component　is　proposed　here.　It　can　effectively　improve　the　stiffness　and　strength　of　beam-column　connections　and　has　sufficient　energy-dissipating　performance　and　ductility.　Seven　different　energy-dissipating　components　were　tested,　including　one　angle　steel　component　and　six　SAS　components.　The　strength　and　deformation　capacity　of　the　components　were　compared　based　on　monotonic　loading　tests.　The　SAS　component　with　the　highest　out-of　plane　stability　and　sufficient　strength　and　initial　stiffness　was　selected　and　subsequently　tested　under　hysteretic　loading　to　investigate　its　energy-dissipating　performance.　The　theoretical　analysis　methods　of　the　initial　stiffness　and　the　yield　moment　provided　by　the　SAS　components　were　proposed　and　validated　by　the　finite-element　(FE)　models　calibrated　using　experimental　data.