To　study　the　effects　of　the　replacement　rate　of　recycled　coarse　aggregate　(R　C　A)　and　eccentricity　on　the　mechanical　properties　of　recycled　aggregate　concrete　with　ferronickel　slag　filled　circular　steel　tube　columns,　13　specimens　were　designed　for　axial　and　eccentric　compression　tests,　and　load-mid-span　deflection　curve,　lateral　deflection　curve,　stiffness　degradation　and　energy　dissipation　were　analyzed.　Based　on　the　research　results　of　ordinary　concrete　filled　steel　tube　(CFST)　column,　the　prediction　formula　for　the　compression-bending　capacity　of　recycled　CFST　is　regressed.　Results　show　that　the　deflection　shape　of　the　biased　specimen　conforms　to　the　sinusoidal　half　wave　curve.　The　position　of　the　neutral　axis　of　the　cross　section　deviates　to　the　compression　zone　during　loading.　When　the　replacement　rate　exceeds　30%,　with　the　increase　of　R　C　A　replacement　rate,　the　ultimate　bearing　capacity　of　the　specimen　decreases,　the　stiffness　degrades　more,and　the　energy　dissipation　coefficient　of　the　specimen　decreases.　With　the　increase　of　eccentricity,the　ultimate　bearing　capacity　of　the　specimen　decreases,the　envelops　area　of　the　lateral　deflection　curve　increases　gradually,and　the　stiffness　degenerates　more.　The　values　calculated　by　the　fitting　formulas　are　in　good　agreement　with　the　experimental　results.　©　2024　Xi＇an　Jiaotong　University.　All　rights　reserved.