Method for identifying crack area of space balance truss plate girder

Abstract

The invention discloses a method for identifying a crack area of a space balance truss plate girder, which comprises the following steps: arranging an original plate girder and a control experiment group plate girder, and applying static load force to the bottom of the original plate girder and the control experiment group plate girder to respectively obtain strain value distribution at each measuring point position; calculating the curvature radius corresponding to each measuring point position according to the strain value distribution; comparing and judging whether the curvature radiuses corresponding to the measuring point positions of the original plate girder and the control experiment group plate girder meet a judgment standard or not; and if yes, marking the position of the corresponding measuring point, judging a damaged section according to the distribution condition of the limited beam section range in the whole plate beam section, and completing the area identification of the crack. According to the invention, unit division is carried out on the evenly-arranged plate girder, the strain gauges are reasonably arranged, effective identification of the crack section is achieved, then the plate girder area where the crack is located is obtained according to plate girder bending theory parameter reasoning, and the strength of the crack section can be conveniently improved for enterprises.

Description

technical field [0001] The invention relates to the technical field of structural failure testing and analysis, in particular to a method for identifying crack regions of space-balanced truss plate girders. Background technique [0002] The plate beam structure is widely used in many professional fields such as electric power, civil engineering, and mechanical engineering. It is the key and foundation of the supporting force of major national equipment. The plate beam structure is often in complex environments such as high temperature, high humidity, high speed, overload, and cyclic fatigue corrosion. Under the circumstances, once the plate girder structure is cracked and damaged, the stability, safety and comfort of the mechanical equipment will be affected, and even accidents involving machine crashes and fatalities may occur. [0003] In the past structural fault analysis, experts at home and abroad have proposed many fault diagnosis technologies for structural cracks in ...

AI Technical Summary

Problems solved by technology

[0003] In the past structural fault analysis, experts at home and abroad have proposed many fault diagnosis technologies for structural cracks in plate girders, such as positioning technology based on EEMD algorithm, beam structure crack damage identification technology based on Lamb waves, etc.; however, currently Most of the research on crack identification or location is based on the source algorithm diagnosis technology based on image data or signal data feature extraction. It is too expensive for production enterprises and lacks a direct, simple, fast, effective and low-cost testing method

[0004] Most of the large plate girders are relatively heavy equipment. In the actual external environment, due to the complex effects of high humidity, high temperature, high salt, and cyclic impact, cracks are easily generated inside the plate girder. Therefore, the existing crack image Identification methods often only analyze obvious cracks, so there is an urgent need for an effective, simple and easy-to-implement method to identify internal crack areas

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