A Frequency And Spatial Domain Decomposition Method For Operational Strain Modal Analysis And Its Application
Keywords
Damage detection; Frequency and spatial domain decomposition; Operational modal analysis; Strain modes
Abstract
Operational modal analysis (OMA), where only the responses are utilized, has been applied to various engineering problems more commonly due to its advantages in real life implementations. A frequency and spatial domain decomposition method for operational modal analysis making use of strain measurements is presented in this paper. With the proposed algorithm, accurate global characteristics of a structure can be obtained from only the measured strain responses. Singular value decomposition, power spectrum enhancement, and the least square fitting techniques are adopted to decouple and obtain the strain modes one by one. Strain modal analysis and acceleration modal analysis are conducted simultaneously to extract the modal parameters of a four-span bridge model with a pair of heavily coupled modes. The processes and the results are carefully compared with each other. Starting from the abnormal strain modes observed, the accidental change of a boundary condition of the bridge model is successfully detected, and also accurately located by the correlation calculation of strain mode shapes.
Publication Date
5-1-2016
Publication Title
Engineering Structures
Volume
114
Number of Pages
104-112
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1016/j.engstruct.2016.02.011
Copyright Status
Unknown
Socpus ID
84958959278 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/84958959278
STARS Citation
Wang, T.; Celik, O.; Catbas, F. N.; and Zhang, L. M., "A Frequency And Spatial Domain Decomposition Method For Operational Strain Modal Analysis And Its Application" (2016). Scopus Export 2015-2019. 2527.
https://stars.library.ucf.edu/scopus2015/2527