期刊
ENGINEERING STRUCTURES
卷 114, 期 -, 页码 104-112出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2016.02.011
关键词
Strain modes; Operational modal analysis; Frequency and spatial domain decomposition; Damage detection
资金
- Florida Department of Transportation (FDOT)
- Federal Highway Administration
- Fundamental Research Funds for the Central Universities of China [NS2013004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- China Scholarship Council
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. (C) 2016 Elsevier Ltd. All rights reserved.
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