Bridge pier VSR (vibration stress relief) method for steel structural bridge

Abstract

The invention discloses a bridge pier 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 bridge pier of the steel structural bridge is a high-rigidity and heavy large structural part, and stress relief treatment is difficult to perform with existing thermal stress relief, natural stress relief, ultrasonic impact stress relief and VSR methods. According to the method, the bridge pier is supported by a support pad, multiple sets of VSR equipment are used, multiple vibration exciters are adjacently fixed on a lower frame beam of the bridge pier, multiple vibration testers are adjacently fixed on an upper frame beam of the bridge pier, then, multiple vibration exciters are controlled by use of multiple controllers, co-frequency sub-resonance vibration is performed on multiple resonance peaks of the bridge pier for several hours, the purpose of effectively relieving the residual stressis achieved, the average relief rate of the residual stress reaches 43%, the problem of difficulty in relieving the residual stress of the bridge pier is solved, and the method can be applied to steelstructural 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 welding residual stress of piers of steel structure bridges. Background technique [0002] Steel structure bridges and concrete bridges are two basic structural types of modern bridge structures. The steel structure has the advantages of light weight, uniform material, stable quality, easy factory manufacturing, assembly construction, easy recycling and strong seismic performance, and is highly respected by the bridge industry in the world. At present, the proportion of steel structure bridges in countries such as France, Japan and the United States is 85%, 41% and 35% respectively, but the proportion of steel structure bridges in my country is less than 2%. With the rapid development of my country's railway and highway construction, and the rapid development of railway and highway construction in...

AI Technical Summary

Problems solved by technology

However, conventional vibration aging treatment methods use a single vibration aging equipment to perform vibration aging treatment on the workpiece, which cannot effectively eliminate residual stress for large workpieces such as bridge piers. The reason is that a single vibration aging equipment , both use a single exciter to generate dynamic stress, and perform resonance vibration at its sub-resonance point to eliminate residual stress. To effectively eliminate residual stress, the dynamic stress generated by the resonance of the exciter must be superimposed on the residual stress. Only when the yield limit of the material is exceeded, the residual stress can be effectively eliminated. However, a large workpiece such as a bridge pier has strong rigidity and heavy weight. A single vibrator is used for vibration aging treatment, and the dynamic stress generated during resonance is very small. After the residual stress is superimposed, it cannot exceed the yield limit of the material, so the purpose of effectively eliminating the residual stress cannot be achieved

In addition, the exciting force of the exciter of the existing single vibration aging equipment in the world does not exceed 50KN, and it is difficult to obtain the dynamic stress required for resonance of such large workpieces, and it is necessary to develop a larger The vibration aging equipment with exciting force is extremely technically difficult

[0006] For a long time, many enterprises at home and abroad have tried to use vibration aging to eliminate the residual stress of the piers of steel structure bridges, but they have not been successful. This is also recognized as a long-standing problem in the steel structure bridge industry, and it is also what people have been eager to solve. a worldwide technical problem

[0007] Since the piers of steel structure bridges cannot be subjected to aging treatment to eliminate residual stress, there are not only hidden dangers of bridge quality problems caused by residual stress, but also affect the promotion and application of steel structure bridges

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