Abstract
A new technical solution of I-beam bent-welded profiles with perforated stacks and shelves with closed welds is presented. Each of the inclined faces of the shelves in cross-section has the shape of half a round halfring (a circle) with a radius equal to the height of the shelves. The maximum height of the cutouts is limited by the height of the single wall. The calculation of optimal parameters along the middle line of a thin-walled cross-section of an I-beam shape with a single wall and closed (tubular) shelves is given. As a double optimization criterion, the maximum of the moment of resistance of the section in the force plane of the supporting structure and the maximum height of the cutouts in the perforated wall. According to the results of solving the optimization problem, the moment of resistance and the height of the cutouts are maximal when this height reaches 0.84 of the entire height of the profile, and the ratio of the width and height dimensions is 1/6,4. The optimization calculation is supplemented by the calculation of the deflection of the punch using the reduced moment of inertia of the section, determined from the equality of the areas of the calculated and conditional plots. A comparative analysis of the design parameters of I-beam rolled and bent-welded profiles with perforated the main results of which revealed a noticeable increase in the mounting (lateral) rigidity of the new modification and confirmed the prospects of its use in load-bearing structures of buildings and structures.
Published Version
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