基于曲率模态小波分析对隧道结构进行损伤识别

摘要

Focused on tunnel structure damage such as cracks or deformation,this paper,regarding curvature modal which is sensitive to change of part structure characteristics as the response signal,simplifies the tunnel structure with finite element analysis software,imitates the damage of the specific part in the tunnel, extracts its radial displacement modal,and then transforms it with wavelet from radial displacement modal into its curvature modal, and so to indentify the structure damage. Results show that,for judging single or multiple damage position,the wavelet analysis based on the curvature modal method can wel identify the damage location of tunnel structure,and at the same time,has better recognition accuracy.%本文主要针对隧道结构出现裂缝、变形等损伤，以对结构局部特征变化比较敏感的曲率模态作为响应信号，利用有限元分析软件对隧道进行简化，对隧道某一特定部位模拟损伤，提取其径向位移模态，然后利用小波将其径向位移模态转化成曲率模态，进而对其进行识别。结果显示，基于曲率模态的小波分析方法可以较好识别出隧道结构的损伤位置，对于单个或者多个损伤位置都具有较好的识别准确性。