Add to ORKGThis research paper presents the comparative analysis of lateral-torsional buckling resistance of structural aluminium alloy members, accounting for the effects of initial geometrical imperfections. The results of non-linear numerical analysis, conducted using ABAQUS software, are compared with the results obtained by utilizing the procedure for calculation of LTB resistance suggested by EN 1999-1-1. The purpose of the analysis is the assessment of accuracy of the above-mentioned code-prescribed design method using the real Al channelsection members with initial imperfections on which the load does not act in the shear centre