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In this paper, elastic interactive local buckling formulas of box section and channel section are established according to classic differential equation of plate stability. Formulas calculating restraint coefficient of adjacent plate parts are also derived. Based on the effective thickness method adopted by current code of various countries treating stiffened plate and non-stiffened plate, the restraint coefficient is then introduced to account for the restraining action exerted by adjacent plate element and its effect on the bearing capacity of cross section. Finally, non-linear finite element analyses are employed to predict the ultimate strengths of box section and channel section under uniform compression, and the results are compared with the approximate approach developed in this paper. It is found that the plate assembly effect does exist when local buckling takes place, and the results given by the approach in this paper are inclined to be safe in most cases.
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