Review article

The main factors accompanying the processes of reinforcement of steel structures under operational load and those reducing its effectiveness (initial stresses, deformability of elements under load, the presence of ceiling seams, etc.) are described. The proposed method of strengthening the bending elements on the example of steel I-beams is analyzed. Reinforcement is assumed to be a strip welded to the lower shelves of the I-beams through intermediate U-shaped elements. This strip, therefore, plays a kind of tightening role. The method allows solving the problem of different curvature of reinforced and reinforcing elements, avoiding overlapping of ceiling joints and performing most of the welding joints in factory conditions.