This　paper　presents　a　numerical　investigation　into　the　post-fire　performance　of　geopolymeric　recycled　aggregate　concrete-filled　steel　tube　(GRACFST)　columns　under　a　full-coupled　fire　and　loading　phase,　including　ambient　temperature　loading,　heating,　cooling,　and　post-fire　loading.　First,　mechanical　property　models　for　passively　confined　geopolymeric　recycled　aggregate　concrete　(GRAC)　in　steel　tubes　were　calibrated　across　the　four　temperature　phases　using　existing　test　data.　A　refined　finite　element　analysis　(FEA)　model　was　then　developed　and　validated　against　existing　test　results,　showing　acceptable　accuracy.　This　model　was　further　extended　to　simulate　a　full-size　GRACFST　column,　examining　temperature　distribution,　deformation,　stress　development,　load　redistribution,　and　steel-concrete　interaction.　Using　the　proposed　FEA　model,　a　parameter　analysis　was　conducted　to　identify　key　factors　affecting　fire　resistance　and　post-fire　bearing　capacity.　The　results　indicated　that　the　column　load　ratio,　section　dimensions,　and　slenderness　ratio　significantly　impact　fire　resistance,　while　post-fire　bearing　capacity　is　mainly　influenced　by　column　load　ratio,　heating　time　ratio,　section　dimensions,　steel　ratio,　slenderness　ratio,　steel　yield　strength,　and　concrete　compressive　strength.　Finally,　simplified　equations　are　proposed　for　fire　design　and　post-fire　evaluation　of　GRACFST　columns.