Concrete　Filled　Steel　Tubular　(CFST)　structures　are　increasingly　used　not　only　for　columns　in　tall　buildings　but　also　in　the　arch　trusses　of　many　arch　bridges　and　in　the　truss　girders　of　buildings　and　bridge　decks.　Therefore,　the　chords　of　Circular　Hollow　Section　(CHS)　truss　arches　and　girders　are　increasingly　filled　with　concrete,　effectively　making　them　CFST　structures.　In　addition　to　the　strength　and　stiffness　of　the　CFST　members,　the　failure　mode　of　the　CFST　joint　connecting　them　to　the　tubular　member　is　also　affected　by　the　concrete　filling.　In　this　study,　truss　girders　with　different　web　arrangements　were　tested,　and　their　behaviour　investigated.　The　girders　were　not　slender　because　they　were　designed　to　attain　the　peak　limiting　state　for　joint　failure　rather　than　chord　failure　due　to　bending　moments.　Moreover,　two　other　types　of　girders　were　tested:　one　without　concrete-filled　chords　(CHS　girder)　and　another　with　only　the　upper　chord　filled　with　concrete;　thus　allowing　an　investigation　of　how　a　concrete-filled　chord　affects　joint　failure　mode.　The　geometry　of　the　CHS　girder　joints　was　such　that　only　chord　face　failure　and　punching　shear　failure　could　occur.　The　former　required　an　inward　deformation　that　was　prevented　by　the　concrete　filling　in　a　CFST　girder　with　similar　geometry.　Finally,　the　study　considers　extending　the　Eurocode　3　and　the　AWS　D1,1　code　formulae,　originally　proposed　for　CHS　joints,　to　calculate　the　resistance　of　CFST　joints.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.