A method of two-dimensional modelling for the analysis of symmetrical structures subjected to eccentric transverse loading is presented. The three-dimensional behaviour of the structure is decomposed into separate translational and twisting behaviour under the respective transverse and torque loadings. A two-dimensional model is formed and analyzed for each mode of behaviour and the results are combined to represent the total behaviour of the structure. The method is suitable for structures consisting of bents parallel to the direction of transverse loading. The bents can be of any type and may vary in their properties over the height. Key words: structural analysis, symmetrical structures, two-dimensional model.