Method for measuring local geometric initial defects of steel member with box-shaped section

Abstract

The invention belongs to the technical field of steel structures in structural engineering and particularly relates to a method for measuring local geometric initial defects of a steel member with a box-shaped section. The method comprises the following steps: respectively measuring vertical distances c1 and c2 from midpoints of two opposite edges on the outer surface of each of four steel plates of the measured steel member with a box-shaped section to a plane formed by four vertexes of the outer surface of the steel plate; measuring the vertical distance c3 from the center of the outer surface of each of four steel plates to the plane formed by the four vertexes of the outer surface of the steel plate; respectively calculating the local geometric initial defect values delta 1, delta 2, delta 3 and delta 4 of the outer surfaces of the four steel plates; and in comparison with the technical standards of the steel member with a box-shaped section, judging the quality of the steel member with a box-shaped section. According to the method, a steel rule and a feeler gauge which are common measurement tools are used for measuring the local geometric initial defects of the steel member with a box-shaped section; and the method has no special requirements on the site and auxiliary fixing devices for the steel member and is applicable to the measurement of local geometric initial defects of the steel member with a box-shaped section and the experimental study on stability performance of the steel member.

Description

technical field [0001] The invention belongs to the technical field of structural engineering steel structures, and in particular relates to a method for measuring local geometric initial defects of box-shaped steel components. Background technique [0002] The construction quality acceptance specification of structural engineering has specific requirements for the local flatness of the steel plate delivered from the factory, but there is no specific requirement for the flatness of the steel plate of the structural members (such as columns and beams) welded by the steel plate. Therefore, for box-section components There is no standard value for the value of the geometric initial defect of the steel plate. However, in the field of steel structure research, the study of stability issues is one of the most important topics, and the local geometric initial defects are just the most important factors affecting the local stability performance of components, so in the relevant expe...

AI Technical Summary

Problems solved by technology

However, the existing methods suitable for the measurement of the overall geometric initial defects of components (drawing method, etc.) are not suitable for the on-site measurement of the local geometric initial defects of structural components due to their low operability. The more advanced 3D imaging scanning technology has complex equipment, Expensive, not suitable for construction site measurement

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