Experimental Research on Carrying Capacity of Welded Aluminium Alloy Compression MembersWU Yun1,PENG Shao-min2(1.Shanghai Foreign Service Co Ltd,Shanghai 200021,China;2. School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)Aluminium alloy as a new type of structural material,becomes more and more widely used in modern architecture.Now much study is done on extruded aluminium alloy members[1],while little is done on welded ones.Aluminium alloy welding will induce residual stress,what's more,reduce the material strength significantly in a localized region,known as the heat-affected zone(HAZ) softening,which will normally not happen to structural steel except high strength steel,for which such a reduced strength zone may however occur,the strength is not so drastically reduced as for aluminium alloy and the width of the heat-affected zone is much smaller due to the difference in heat transfer.Thus,experimental study of longitudinally welded I-section aluminium alloy columns subjected to axial compress will be conducted.The test strengths will be compared with the design strengths obtained using code for design of aluminium structures(draft) and eurocode 9 for aluminium structures.Generally,the codes predict the strengths of the double T profiles with fillet welds columns well.aluminium alloy;weld;I-section;heat-affected zone(HAZ);carrying capacity