Taper slots (angular defects) and relative displacements of connected parts of a structural connection (linear defects) are the geometrical imperfections that occur during the assembly of the structure. They cause internal forces and their calculation formula is presented in the paper. Moreover, due to that imperfections, strains and stresses in the connection and in the whole structure are complex and characterized by the moments and forces: M-x, M-y, M-s, V-x, Y-y, N. The method of analysis of the end-plate connections with geometrical imperfections is presented in the paper.