In　modern　building,　construction,　thin-walled　hollow　structural　steel　(HSS)　sections　are　often　filled　with　concrete　to　form　a　composite　column.　In　recent　years,　the　use　of　self-consolidating　concrete　(SCC),　or　self-compacting　concrete,　in　such　kinds　of　columns　has　been　of　interest　to　many　structural　engineers.　Due　to　its　theological　properties,　the　disadvantage　of　vibration　can　be　eliminated　while　still　obtaining　good　consolidation.　Apart　from　reliability　and　constructability,　advantages　such　as　elimination　of　noise　in　processing　plants,　and　the　reduction　of　construction　time　and　labor　cost　can　be　achieved.　It　is　expected　that　SCC　will　be　used　in　concrete-filled　HSS　columns　in　the　future　because　of　its　good　performance.　However,　the　composite　members　are　susceptible　to　the　influence　of　concrete　compaction.　The　lack　of　information　on　the　behavior　of　HSS　columns　filled　with　SCC　indicates　a　need　for　further　research　in　this　area.　The　present　study　is　an　attempt　to　study　the　possibility　of　using　thin-walled　HSS　columns　filled　with　SCC.　New　test　data　on　38　HSS　columns　filled　with　SCC　to　investigate　the　influence　of　concrete　compaction　methods　on　the　member　capacities　of　the　composite　columns　are　reported.　The　specimen　tests　allowed　for　the　different　conditions　likely　to　arise　in　the　manufacture　of　concrete:　cured,　well　compacted　with　a　poker　vibrator,　well　compacted　by　hand,　and　self-consolidating　without　any　vibration.　The　main　parameters　varied　in　the　tests　are:　(1)　column　section　type,　circular　and　square;　(2)　tube　diameter　(or　depth)　to　thickness　ratio,　from　33　to　67;　and　(3)　load　eccentricity　ratio　(e/r),　from　0　to　0.3　mm.　Comparisons　are　made　with　predicted　column　strengths　using　the　existing　codes　such　as　AISC-LRFD-1999,　AIJ-1997,　BS5400-1979,　EC4-1994,　DL5085/T-1999　and　GJB4142-2000.　(C)　2004　Elsevier　Ltd.　All　rights　reserved.