An　experimental　investigation　was　conducted　on　empty　and　grouted　stainless　steel　tubular　X-joints　with　circular　hollow　section　(CHS)　chord　member　under　axial　compression.　A　total　of　25　specimens　including　empty　tubular　joints,　tubular　joints　with　grouted　brace　members　only,　tubular　joints　with　grouted　chord　member　only　and　tubular　joints　with　both　grouted　brace　and　chord　members　were　tested.　The　joint　strengths,　failure　modes,　axial　load-vertical　displacement　curves,　axial　load-chord　deformation　curves　and　strain　distribution　curves　of　all　specimens　were　reported.　The　corresponding　finite　element　analysis　(FEA)　was　also　performed　and　calibrated　against　the　test　results.　Therefore,　an　extensive　parametric　study　was　carried　out　to　evaluate　the　effects　of　main　influential　factors　(β　τ　grouting　and　grout　strength)　on　the　behaviour　of　grouted　stainless　steel　tubular　X-joints　with　CHS　chord　member　under　axial　compression.　It　is　shown　from　the　comparison　that　the　ultimate　strengths　of　empty　and　grouted　stainless　steel　tubular　X-joints　generally　increased　with　the　increase　of　the　β　and　τ　values.　Furthermore,　the　ultimate　strengths　of　stainless　steel　tubular　X-joints　with　both　grouted　brace　and　chord　members　generally　increased　with　the　increase　of　the　grout　strength.　Whereas,　the　grout　strength　has　little　influence　on　the　ultimate　strengths　of　stainless　steel　tubular　X-joints　with　grouted　chord　member　only.　On　the　other　hand,　the　joint　strengths　obtained　from　the　tests　and　parametric　study　were　compared　with　the　design　strengths　calculated　using　the　current　design　rules.　It　is　shown　from　the　comparison　that　the　current　design　rules　are　generally　unconservative　for　empty　and　grouted　stainless　steel　tubular　X-joints　with　CHS　chord　member　under　axial　compression.　Therefore,　the　new　design　equations　were　proposed　in　this　study,　which　were　verified　to　be　more　accurate.　©　2017　Elsevier　Ltd