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Identification of the Swiss Z24 Highway Bridge by Frequency Domain Decomposition
This paper presents the result of the modal identification of the Swiss highway bridge Z24. A series of 15 progressive damage tests were performed on the bridge before it was demolished in autumn 1998, and the ambient response of the bridge was recorded for each damage case. In this paper the modal properties are identified from the ambient responses by frequency domain decomposition. 6 modes were identified for all 15 damage cases. The identification was carried out for the full 3D data case i.e. including all measurements, a total of 291 channels, a reduced data case in 2D including 153 channels, and finally, a 1D case including 20 channels. The modal properties for the different damage cases are compared with the modal properties of the undamaged bridge. Deviations for frequencies, damping ratios and MAC values are used as monitoring variables. From these results it can be concluded, that frequencies and model shapes for the structure changed significantly during damage. Further, it can be concluded, that the spatial information gained by a large number of channels does not seem to result in significant better estimates of frequency and mode shape deviations.
Identification of the Swiss Z24 Highway Bridge by Frequency Domain Decomposition
This paper presents the result of the modal identification of the Swiss highway bridge Z24. A series of 15 progressive damage tests were performed on the bridge before it was demolished in autumn 1998, and the ambient response of the bridge was recorded for each damage case. In this paper the modal properties are identified from the ambient responses by frequency domain decomposition. 6 modes were identified for all 15 damage cases. The identification was carried out for the full 3D data case i.e. including all measurements, a total of 291 channels, a reduced data case in 2D including 153 channels, and finally, a 1D case including 20 channels. The modal properties for the different damage cases are compared with the modal properties of the undamaged bridge. Deviations for frequencies, damping ratios and MAC values are used as monitoring variables. From these results it can be concluded, that frequencies and model shapes for the structure changed significantly during damage. Further, it can be concluded, that the spatial information gained by a large number of channels does not seem to result in significant better estimates of frequency and mode shape deviations.
Identification of the Swiss Z24 Highway Bridge by Frequency Domain Decomposition
Brincker, Rune (Autor:in) / Andersen, P. (Autor:in)
01.01.2002
Brincker , R & Andersen , P 2002 , Identification of the Swiss Z24 Highway Bridge by Frequency Domain Decomposition . in Proceedings of IMAC 20 : A Conference on Structural Dynamics : februar 4-7, 2002, The Westin Los Angeles Airport, Los Angeles, California . Society for Experimental Mechanics , pp. 442-447 , The International Modal Analysis Conference , Los Angeles, California , United States , 04/02/2002 .
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Bridge Condition Monitoring Using Frequency Domain Decomposition Method
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