Reinforced　concrete　(RC)　flat　plate　structures　are　broadly　used　in　car　parks,　residential　and　office　buildings　due　to　their　economic　and　architectural　advantages.　However,　this　structural　system　is　inherently　prone　to　punching　shear　failure,　which　may　propagate　horizontally　and　vertically,　ultimately　leading　to　the　progressive　collapse　of　the　entire　structure　or　of　a　large　portion　of　it.　This　paper　presents　the　experimental　results　from　two　quasi-static　large-displacement　tests　performed　on　a　1/3　scale,　2　x　2-bay,　RC　flat　plate　substructure　subjected　to　corner　column　removal　scenarios.　The　specimen　was　tested　twice　with　different　corner　reinforcement　configurations:　(i)　firstly,　one　corner　column,　with　torsional　strips,　was　removed　and　the　Uniformly　Distributed　Load　(UDL)　on　the　bay　adjacent　to　the　removed　column　was　increased　to　failure　(Test　T1),　and　(ii)　secondly,　as　the　damage　was　concentrated　in　the　vicinity　of　removed　corner　column　in　(i),　the　corner　column　diagonally　opposite　to　the　first　removed　one,　without　torsional　strips,　was　removed.　The　UDL　on　the　bay　adjacent　to　the　second　removed　column　was　also　increased　to　failure　(Test　T2).　Different　failure　and　post-failure　behaviours,　failure　modes,　and　collapse　resisting　mechanisms　between　the　two　tests　were　witnessed,　presented　and　analysed.　Results　show　that　80%　to　110%　of　the　applied　load　is　transferred　to　the　two　edge　columns　adjacent　to　the　removed　corner　column　throughout　the　entire　two　tests.　The　ultimate　load　carrying　capacity　for　T1　is　found　to　be　1.7　times　smaller　than　the　one　for　T2.