METHOD OF VIBRATION PROCESSING OF STRUCTURE FOR CHANGE OF STRESS-STRAIN AND STRUCTURAL STATE OF MATERIAL Russian patent published in 2019 - IPC E01D101/30 B23P25/00 C21D1/04 

FIELD: machine building.

SUBSTANCE: invention relates to bridge construction, in particular to stabilization of geometrical dimensions of welded structures by means of vibration resonance loading, and can be used for removal of residual stresses in welded main and longitudinal beams of drift roadway bridge. In vibration-resonance loading, the resonance frequency of the natural frequency of the structure at the ends of the weld is first determined using the constructed finite-element three-dimensional structure model, then exciting oscillations by method of small effects in range ±20 % of this frequency, vibration records are recorded, and according to the oscillation amplitude increase, the first resonance frequency is fixed on the vibration chart, on which vibration processing is carried out for 10–20 minutes.

EFFECT: vibration processing of the local zone facilitates reduction of residual stresses, prevents occurrence of fatigue cracks and increases fatigue durability of welded beams of superstructures and carriageway of bridges.

1 cl, 4 dwg