Method for identifying damage and quantitatively analyzing damage degree of main girder of bridge erecting machine

Abstract

The invention relates to a method for identifying damage and quantitatively analyzing damage degree of a main girder of a bridge erecting machine. Based on the present situation that the main girder support changes with time in the operation process of the bridge erecting machine, a main girder structure type judging module MI, a damage identifying and analyzing module MII and a damage quantitatively analyzing module MIII are established. The damage identifying and analyzing module includes: (1) a deflection test system is installed; (2) deflection detection data is collected; (3) the detection data is processed to obtain a deflection influence line f1 (x); (4) the deflection influence line is processed to obtain a deflection rate curve f1 "(x); (5) whether mutation exists is judged; (6) the locations and quantity of injuries are judged. The damage quantitatively analyzing module includes: (1) a numerical simulation model is established; (2) n kinds of damage conditions are constructed, and m damage degrees are constructed for each kind of damage condition. (3) the deflection values of different damage degrees are obtained, and the relationship curve of deflection rate and damage degree is defined. (4) the relationship of deflection rate and damage degree of the main girder of the bridge erecting machine is obtained. The invention solves the problem that the structural damage of the main girder of the bridge erecting machine cannot be found in time, and the bridge erecting machine is easy to cause a serious safety accident.

Description

technical field [0001] The invention belongs to the technical field of mechanical structure damage identification and analysis, and relates to a damage identification and damage degree quantitative analysis method for a main girder of a bridge erecting machine. Background technique [0002] Bridge erecting machines are widely used in bridge erection construction in high-speed railway construction. The operating environment is harsh, and they are often transferred to other sites. Damages such as weld corrosion and plate cracking occur from time to time, which can easily lead to major safety accidents. In recent years, safety accidents of bridge erecting machines have occurred frequently, causing heavy casualties and property losses. In order to detect potential safety hazards of bridge erecting machines early, the problem of structural damage identification of bridge erecting machines has attracted increasing attention. [0003] Structural damage identification has always be...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a bridge erecting machine main girder damage identification and damage degree quantitative analysis method to overcome the shortcomings of the prior art damage identification technology that requires the bridge erecting machine main girder before damage mode and physical parameters, so as to adapt to the bridge erecting machine. During the hole operation, the supporting state of the main girder of the bridge erecting machine changes randomly at any time, and solves the problem that the structural damage of the main beam of the bridge erecting machine cannot be detected in time and easily causes major safety accidents

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