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Abstract. The attention of engineers is turned to the application of precast spun concrete columns reinforced by highstrength steel bars for office and administrative buildings. The paper discusses a possibility of using the reliability index approach to designing beam-columns of building frames and analyses resistance criteria for beam-columns of annular cross sections as compression members with bending moments and bending members with compressive forces. First and second order effects of beam-columns are considered. The article also presents time-dependent resistance safety margin and its stationary equivalent and investigates the unsophisticated applied models for probability-based design of frame beam-columns. The design of a beam-column of the braced frames is illustrated providing a numerical example.

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