A　replaceable　steel　frame　connection　with　low　yield　point　(LYP)　angle　steel　components　is　proposed　for　realizing　structural　damage　control　and　quick　recovery　after　earthquakes.　Numerical　models　of　connections　were　established　using　finite　element　software　ABAQUS　and　the　accuracy　and　applicability　were　verified　using　typical　test　results.　Based　on　the　verified　numerical　method,　models　with　various　weakened　degrees　and　different　materials　of　angle　steel　components　were　established,　and　optimal　damage　control　configuration　was　selected.　Then,　models　with　different　weakened　degrees　and　different　free　deformation　lengths　of　the　web　of　angle　steel　were　established.　The　influence　of　the　two　parameters　on　the　seismic　behavior　and　the　function　of　structural　fuses　was　discussed,　and　some　design　suggestions　were　proposed.　The　analysis　results　show　that　the　LYP　steel　angle　components　can　dissipate　95%　of　the　system　energy,　effectively　protect　the　primary　structure　and　ensure　the　ductility　of　connections.　Considering　the　manufacturing　difficulty,　energy　dissipation　ratio,　structural　fuse　function　and　material　utilization　rate,　the　connection　with　thin　web　angle　steel　components　is　a　feasible　solution.　With　the　increase　of　the　weakened　degree,　the　plastic　deformation　and　energy　dissipation　proportion　of　angle　steel　components　increase,　indicating　the　structural　fuse　function　is　effectively　enhanced.　With　the　increase　of　the　free　deformation　length,　the　energy　dissipation　proportion　of　the　angle　steel　component　increases,　revealing　that　this　measure　can　effectively　protect　the　main　structure　without　excessively　reducing　the　connection　strength.　However,　when　the　free　deformation　length　exceeds　the　width　of　the　beam,　the　out-of-plane　buckling　is　obvious,　which　adversely　affects　the　ductility　of　the　connection,　while　the　enhancement　of　energy　dissipation　prportion　is　not　obvious.　Therefore,　based　on　reasonable　design　bearing　capacity　coefficient　(not　exceeding　1.0),　appropriately　increasing　the　free　deformation　length　(not　exceeding　the　width　of　the　beam)　can　improve　the　effectiveness　of　structural　fuses.　©　2021,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.