Abstract
A new technical solution for semi-flat bent-welded profiles is presented, optimized for bending strength characteristics, the originality of which has been confirmed by patent examination. Rectangular profiles with a ratio of width and height 1/3 along the middle section line served as the basis for their shaping, which ensures maximum strength. As a prototype, semi-flat profiles are assembled on the basis of flat-oval profiles with maximum strength due to the ratio of width and height 1/3.064 along the middle section line. The calculation of the optimal parameters of thin-walled sections using an approximate technique using their average lines, repeatedly tested in solving optimization problems for bent-welded profiles of various shapes and outlines, is presented. A comparative analysis of the design parameters revealed a positive effect of optimized profiles in truss and girder structures, including a reduction in the consumption of structural material, a decrease in stress concentration, and a reduction in building height. The prospects of expanding the scope of their rational use with the addition of pipe-concrete and steel-reinforced concrete structures are indicated.
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