FIELD: construction engineering. SUBSTANCE: this relates to design of three-dimensional steel structures of column-type, various types of supports. Three-dimensional bar of equal-side triangular cross-section has load-bearing members of angular profile located in tops of triangle and connected by grate. Load-bearing members and grate components are made of steel equal-flange angular profile created by flanges and annular segment. Flanges are located at angle equal to 60 deg. Value of annular segment radius is determined by relation brought forth in description of invention. EFFECT: higher efficiency. 1 cl, 2 dwg
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