This　paper　proposes　a　rectangular　steel-concrete　composite　column　(RSCC)　with　three　cavities,　which　has　a　good　architectural　function.　The　composite　column　consists　of　steel　tubes　at　both　ends,　steel　plates　in　the　middle,　and　concrete　in　the　cavity.　Five　RSCC　with　three　cavities　were　tested　to　investigate　the　seismic　performance　of　the　column　width　and　headed　studs.　It　was　found　that　the　specimens　all　exhibited　flexural　damage　in　the　form　of　flexural　tearing　of　the　steel　tube/plate　and　crushing　of　the　concrete　in　the　steel　tube　cavity.　As　the　column　width　increases,　the　load　bearing　ratio　and　the　percentage　of　shear　displacement　in　the　middle　cavity　of　the　specimen　increase.　The　use　of　headed　studs　in　RSCC　with　three　cavities　delay　the　stiffness　degradation　of　the　specimens,　and　the　ductility　of　the　specimens　with　column　width　of　400　mm　and　500　mm　set　with　headed　studs　increased　by　10.1%　and　4.6%,　respectively,　compared　to　that　of　the　specimens　without　headed　studs.　In　addition,　a　finite　element　model　of　the　RSCC　with　three　cavities　was　established,　and　the　finite　element　analysis　results　matched　well　with　the　experimental　hysteresis　curves　and　damage　characteristics.　A　simplified　lateral　force　calculation　method　was　established,　and　the　average　error　between　the　predicted　values　and　the　corresponding　test　results　for　each　specimen　was　6.1%,　which　verified　the　applicability　of　the　calculation　model　and　provided　a　reference　for　the　engineering　application　of　the　RSCC　which　has　good　function　and　performance.　©　2023　Elsevier　Ltd