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Proceedings Paper

Stochastic subspace identification for operational modal analysis of an arch bridge
Author(s): Chin-Hsiung Loh; Ming-Che Chen; Shu-Hsien Chao
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Paper Abstract

In this paer the application of output-only system identification technique, known as Stochastic Subspace Identification (SSI) algorithms, for civil infrastructures is carried out. The ability of covariance driven stochastic subspace identification (SSI-COV) was proved through the analysis of the ambient data of an arch bridge under operational condition. A newly developed signal processing technique, Singular Spectrum analysis (SSA), capable to smooth noisy signals, is adopted for pre-processing the recorded data before the SSI. The conjunction of SSA and SSICOV provides a useful criterion for the system order determination. With the aim of estimating accurate modal parameters of the structure in off-line analysis, a stabilization diagram is constructed by plotting the identified poles of the system with increasing the size of data Hankel matrix. Identification task of a real structure, Guandu Bridge, is carried out to identify the system natural frequencies and mode shapes. The uncertainty of the identified model parameters from output-only measurement of the bridge under operation condition, such as temperature and traffic loading conditions, is discussed.

Paper Details

Date Published: 3 April 2012
PDF: 12 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 834504 (3 April 2012); doi: 10.1117/12.912514
Show Author Affiliations
Chin-Hsiung Loh, National Taiwan Univ. (Taiwan)
Ming-Che Chen, National Taiwan Univ. (Taiwan)
Shu-Hsien Chao, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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