Battened built-up member under compression and bending with one end fixed and the other end free

Eurocodes EN 1993 Design of steel structures and EN 1999 Design of aluminium structures give guidance on how to design and verify uniform built-up member under compression with hinged ends laterally supported. The built-up members in Eurocodes are considered as the columns with a local bow imperfection e₀ = L/500 (Ramm, W. & Uhlmann, W.). This paper investigates the more general case. The second order analysis is used for analysis of the battened built-up member with two IPE 240 sections under combined compression and bending. The bottom member end is fixed and the upper end is free. The global initial sway imperfection of the analyzed built-up member is taken into account instead of the local bow imperfection.