Research on Damage Identification of a Beam Based on Curvature Mode

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Shang, Xin^1

China Road and Bridge Corporation (CRBC), Beijing

100011, China^1

关键词: Anti-noise ability;    Curvature calculation;    Damage Identification;    Damage-location identification;    Degree identifications;    Effect of curvature;    Fingerprint method;    Measuring points;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/5/052012/pdf
DOI  :  10.1088/1757-899X/382/5/052012

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

To study the bridge damage location and degree identification ability based on curvature mode, with a three-span continuous steel beam as the research object, compared with the damage location identification of curvature modal difference and displacement modal difference, analyzing the influence of damage location identification on the curvature modal difference index considering the two factors of the measuring point number reduce and the noise, identifying the damage degree by the method of relative variation of the curvature modal shapes. The results show that the location damage identification effect of curvature modal difference is more obvious than that of displacement modal difference, the identification effect has higher requirements for the density of the measuring points and has low anti-noise ability; when the damage degree is recognized, the larger the damage degree is, the smaller the identification result error is. The method of curvature calculation can be incorporated into other dynamic fingerprint methods, and then the ability of damage identification will be further improved.