Steel girder vibration aging method for steel structure bridges

Abstract

The invention discloses a steel beam VSR (vibration stress relief) method for a steel structural bridge and relates to the technical field of stress relief treatment of steel structure parts. A steelbeam comprises a bridge deck part and a support part located below the bridge deck part; multiple sets of VSR equipment are used; the method comprises following operation steps: step one, the steel beam is placed on a support pad; step two, the multiple sets of VSR equipment are mounted on the steel beam; step three, frequency sweeping is performed before vibration; step four, VSR treatment is performed on the steel beam; step five, frequency sweeping is performed after vibration. Compared with the prior art, the method has the advantages that residual stress can be effectively relieved, the average relief rate of the residual stress reaches 49%, the problem of difficulty in relieving the residual stress of the steel beam of the steel structural bridge is solved, and the method can be applied to the manufacturing industry of steel structural bridges.

Description

technical field [0001] The invention relates to the technical field of stress relief treatment of steel structural parts, in particular to a vibration aging method for eliminating residual stress of steel girder welding of steel structure bridges. Background technique [0002] The steel girders of steel structure bridges include steel truss girders, steel box girders, and steel-concrete composite girders. They are large-scale welded structural parts, and some are as high as thousands of tons. This kind of structure is composed of criss-cross ribs, and there are many welding parts. After welding, there is a high residual stress with complex distribution, and the stress concentration phenomenon is prominent. Due to the action of external forces such as wind, the superposition of this residual stress and the working stress of the bridge may lead to serious consequences of deformation or even fracture of the bridge. Therefore, it is necessary to eliminate these residual stresses...

AI Technical Summary

Problems solved by technology

The existing vibration aging methods are all processed by a single vibration aging equipment, but the large steel beam is not only rigid, but also heavy, and the excitation force of a single vibrator is too small, so it is difficult to obtain a steel beam. The dynamic stress required for resonance cannot exceed the yield limit of the material after the dynamic stress and the residual stress are superimposed, so the purpose of effectively eliminating the residual stress of the steel beam cannot be achieved

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