Beam-column　joints　using　dry　connections　usually　experience　severe　damage　under　large　deformations,　causing　precast　concrete　(PC)　frames　with　dry　connections　to　become　highly　vulnerable　to　progressive　collapse.　Hence,　this　study　conducted　a　static　pushdown　test　adopting　uniformly　distributed　loading　on　four　PC　beam-column　assemblies　using　dry　connections　and　one　reinforced　concrete　(RC)　substructure　to　investigate　the　collapse-resisting　behavior　under　the　middle-column　removal　scenario.　The　tested　dry　connections　included　top-and-seat　angle　connection　(TA),　strengthened　top-seat　angle　connection　(STA),　and　two　refined　connections　with　unbonded　post-tensioning　tendons　(UPTA　and　UPSTA,　respectively).　Results　showed　that　compared　with　specimen　RC,　the　resistance　of　specimen　TA　at　the　beam　flexural　and　compressive　arch　action　(B-CAA)　and　catenary　action　(CA)　stages　dropped　by　41%　and　27%,　respectively,　due　to　the　buckling　of　steel　angles　and　endplates　(B-CAA)　and　the　fracture　of　steel　angles　and　bolts　(CA).　Specimen　STA　had　a　7%　greater　resistance　of　B-CAA　because　of　the　strengthened　steel　angles.　However,　the　ductility　decreased,　with　the　displacement　of　rebar　fracture　decreasing　by　37%,　leading　to　a　30%　resistance　reduction　of　CA.　The　unbonded　post-tensioning　tendons　dramatically　improved　the　structural　integrity,　contributing　to　52%　and　97%　increase　in　the　resistance　of　the　CA　of　UPTA　and　UPSTA,　respectively.　Further　numerical　analyses　indicated　that　the　restraint　gaps　reduced　the　initial　stiffness　of　the　collapse　responses,　and　a　good　rebars　welding　anchorage　condition　could　remarkably　improve　the　resistance　in　the　B-CAA　and　CA　stages.　An　improved　joint　was　proposed　based　on　UPTA　and　rebar　welding　anchorage　to　improve　deformation　capacity　while　retaining　reasonable　collapse　resistance.　Finally,　the　resistance　contributions　from　different　mechanisms　and　components　were　identified　through　a　developed　calculation　procedure.　©　2023　Elsevier　Ltd