In　flat　plate　structures,　the　slab-column　joints　are　prone　to　punching　shear　failure,　which　would　trigger　progressive　collapse　of　the　entire　structural　systems.　The　joints　subjected　upward　punching　shear　(UPS)　and　downward　punching　shear　(DPS)　actions　exhibit　different　post-punching　behavior,　which　will　affect　the　progressive　collapse　of　flat　plate　structures.　A　static　collapse　test　was　conducted　on　two　slab-column　joint　specimens　(UPS-1　and　DPS-1).　The　structural　resistance　and　deformation　were　analyzed　to　explore　the　collapse-resistant　mechanism　of　the　joints　after　punching　shear.　The　test　results　illustrate　that　the　post-punching　bearing　and　deformation　capacities　are　governed　by　the　through　column　longitudinal　reinforcement　(including　both　integrity　reinforcement　(IR)　and　flexural　reinforcement　(FR))　in　the　slab.　The　longitudinal　bars　ruptured　in　reverse　orders　under　UPS　and　DPS　failure　scenarios.　In　DPS-1,　the　peak　resistance　under　the　suspension　mechanism　was　reached　when　the　first　FR　bar　ruptured　while　the　IR　bars　remained　intact.　The　peak　resistance　of　UPS-1,　on　the　other　hand,　was　achieved　at　the　onset　of　the　IR　bars　being　ruptured　and　the　FR　bars　being　detached　from　the　concrete.　©　2018　American　Society　of　Civil　Engineers.