This　paper　focused　on　the　uniaxial　ultimate-bearing-capacity　of　large　size　concrete　filled　steel　tubular　(CFST)　columns.　Two　aspects　were　investigated　experimentally.　To　verify　the　feasibility　of　similarity　principles　for　large　size　components,　a　series　of　uniaxial　compressive　experiments　were　conducted　using　different　scaled　specimens,　the　prototype　of　which　is　a　CFST　arch　rib　in　an　authentic　arch　bridge.　Meanwhile,　two　specimens　with　same　scale　were　tested　axially　and　eccentrically　to　investigate　the　difference　of　bearing　capacity　resulted　from　the　pierced-column.　The　experimental　results　show　that　the　size　effect　on　the　bearing　capacity　of　the　rib　is　so　insignificant　that　the　scaled　specimen　can　be　used　to　obtain　the　maximum　capacity　of　the　full-scale　component.　The　inserted　steel　tubes　in　the　middle　of　the　column　cause　the　reduction　of　its　capacity　and　the　reduction　factor　from　axial　loading　is　bigger　than　that　from　bias　load.　Moreover,　the　eccentricity　reduces　the　effect　of　piercing　on　the　capacity　of　CFST　column.　Copyright　©　2013　Trans　Tech　Publications　Ltd,　Switzerland.