In first order critique of hitherto existing conceptions of taking into consideration equivalent imperfections of initial tilt and initial bow joint effect on carrying capacity of steel frames is presented. Statistically based models of random equivalent imperfections assumed in the paper were obtained utilizing authors' research. Combination of column initial tilts random sequence and column random initial bows multiplied by random binary sequence is considered. Conception mentioned above is applied to analyse carrying capacity of 2-bay 5-story example steel frame. Numerical simulations of considered frame carrying capacity are conducted. It enables to evaluate influence of taking into consideration column random initial bows aside from column random initial tilts on steel frame carrying capacity. Results obtained out of conducted analyses shows that influence of column random initial bows on frame limit strength value associated with limit point on frame equilibrium path is slight. This influence turns out significant in case of frame ultimate load carrying capacity analysis according to the most efforted cross-sections criterion.
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