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

Socpus ID

84958959278 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84958959278

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