In　this　study,　the　axial　compressive　performance　of　steel-concrete-steel　composite　walls　(SCSCWs)　with　novel　dumbbell-shaped　connectors　(DSCs)　was　investigated.　Six　specimens　were　designed　and　tested,　and　the　study　parameters　included　the　physical　dimensions　and　arrangement　schemes　of　DSCs.　The　failure　mode,　axial　displacement,　steel　strain,　and　bearing　capacity　of　the　specimens　were　analyzed.　The　external　steel　plates　exhibited　local　buckling,　and　the　internal　concrete　was　crushed.　The　variation　in　the　physical　dimensions　of　the　DSC　had　little　effect　on　the　failure　modes,　and　increasing　the　number　of　connectors　improved　the　bearing　capacity　of　the　specimens.　The　axial　load-displacement　relationships　of　the　SCSCWs　were　calculated　considering　the　effects　of　local　buckling　and　post-buckling　behavior　of　steel　faceplates　in　the　constitutive　relationship.　The　theoretical　curves　were　in　good　agreement　with　the　experimental　results.　A　simplified　formula　for　the　bearing　capacity　was　proposed,　and　the　average　ratio　of　the　experimental　to　theoretical　peak　loads　was　0.98,　indicating　that　the　simplified　formula　had　high　accuracy.　ABAQUS　software　was　used　to　simulate　the　axial　behavior　of　SCSCWs.　The　simulated　results　were　similar　to　those　of　the　experiments,　and　the　average　ratio　of　the　experimental　bearing　capacity　to　the　corresponding　simulated　value　was　0.99.　Based　on　the　benchmark　model,　further　parameter　analyses　were　conducted　to　study　the　effects　of　material　strength　and　physical　dimensions　on　the　axial　behavior　of　SCSCWs.　Increasing　the　material　strength　and　sectional　thickness　could　increase　the　bearing　capacity,　and　the　failure　mode　was　not　affected.　The　theoretical　initial　stiffness　of　the　SCSCWs　was　calculated,　and　the　accuracy　of　the　formulas　was　verified　using　the　simulated　results.