This　study　explores　the　potential　of　rubberized　concrete-filled　steel　tube　(RCFST)　columns　as　a　sustainable　solution　for　mitigating　waste　tire　rubber　pollution.　The　research　focuses　on　utilizing　waste　rubber　particles　to　partially　replace　sand　in　the　concrete,　thereby　modifying　the　concrete　mix　ratio.　Axial　compression　tests　were　performed　on　20　stub　column　specimens　following　exposure　to　elevated　temperatures,　comprising　10　circular　and　10　square　steel　tubes.　The　key　experimental　parameters　investigated　were　the　rubber　replacement　ratio,　temperature,　and　elevated　temperature　duration.　The　impact　of　these　parameters　on　the　load-bearing　behavior　of　RCFST　columns　after　exposure　to　elevated　temperatures　was　assessed　through　analysis　of　failure　modes,　load-displacement　response,　and　stress-strain　relationships.　Irregular　buckling　behavior　during　loading　was　observed　in　RCFST　columns　exposed　to　elevated　temperatures,　according　to　experimental　results.　The　failure　mode　is　characterized　by　an　oblique　circular　shear　failure　that　is　non-parallel.　The　ultimate　bearing　capacity　decreased　with　increasing　rubber　replacement　ratio,　temperature,　and　elevated　temperature　duration.　The　detrimental　effect　on　the　performance　of　RCFST　columns　was　amplified　at　higher　temperatures　and　longer　durations　of　elevated　temperature　exposure.　Specimens　with　a　20%　rubber　aggregate　replacement　ratio　exhibited　a　significant　reduction　in　stiffness,　with　ultimate　load　decreasing　by　28%　and　25%　for　circular　and　square　columns,　respectively,　while　ductility　improved.　A　substantial　degradation　in　ultimate　bearing　capacity　was　observed　when　the　temperature　changed　from　20　degrees　C　to　800　degrees　C,　with　reductions　of　35%　and　43%　for　circular　and　square　columns,　respectively.　Based　on　experimental　findings,　and　following　the　principles　outlined　in　GB　50,936-2014　and　EC4,　a　simplified　formula　was　derived　to　calculate　the　ultimate　bearing　capacity　of　RCFST　columns　after　exposure　to　elevated　temperatures.　The　proposed　formula　demonstrated　good　correlation　with　the　experimental　data　when　compared.