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In the making and erection process of wall-column structural system of electrostatic precipitator casing, the imperfection will be produced inevitably and influence the stability of the column. It’s necessary for numerical simulation model that the imperfection is taken into account when the numerical investigations are carried out into the stability of column. Based on the configurations of profiled steel sheet-rectangular tube column structural systems of practical electrostatic precipitator casings, the influences of initial geometrical imperfections on the stability of columns subjected to axial compression were investigated by the nonlinear finite element method. The results show that when the profiled steel sheet groove direction arranged perpendicular to the column, the most unfavorable initial geometrical imperfection shape is the initial flexural deformation of column section, the most unfavorable initial geometrical imperfection shape is the initial flexural deformation of column section, the most unfavorable and maximum initial geometrical imperfection located in the column apical region where has the high axial force. When setting up the finite element models for the buckling of axially compressed column of casing, in order to fully consider the unfavorable influence of initial geometrical imperfections, it’s necessary to introduce the entire flexural defect mode which occurred in the column apical region.

Influence of initial imperfection on stability of axially compressed column in electrostatic precipitator casing