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Proceedings Paper

Identification of the dynamic behavior of bridges under ambient excitation using wavelet transform
Author(s): Alessandro Fasana; Luigi Garibaldi; Bruno A. D. Piombo; Massimo Ruzzene
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Paper Abstract

This paper deals with the identification of the dynamic behavior of bridges under ambient excitation. The technique here presented allows the estimation of modal parameters using transient data excitations, i.e., the vehicle passage, without requiring any traffic limitation, this fact representing a consistent advantage of the motorway companies. In this paper, the wavelet transform as a time- frequency distribution is proposed for system identification under different traffic conditions: particularly, it is shown how the wavelet analysis of the free response of a real system allows the estimation of natural frequencies, viscous damping ratios and mode shapes with a good precision. The accuracy of this identification technique is firstly proved performing the analysis on a mathematical model of a multi-supported beam with moving loads, simulating a bridge excited by traffic; finally, the acceleration responses from a real bridge, the Queensborough Bridge in Vancouver, Canada, under ambient excitations, are successfully analyzed. The results obtained using this procedure show a good agreement with those already presented in other papers referred to the dynamic identification of the same Queensborough Bridge and reported in references.

Paper Details

Date Published: 13 November 1996
PDF: 12 pages
Proc. SPIE 2946, Nondestructive Evaluation of Bridges and Highways, (13 November 1996); doi: 10.1117/12.259146
Show Author Affiliations
Alessandro Fasana, Politecnico di Torino (Italy)
Luigi Garibaldi, Politecnico di Torino (Italy)
Bruno A. D. Piombo, Politecnico di Torino (Italy)
Massimo Ruzzene, Politecnico di Torino (Italy)

Published in SPIE Proceedings Vol. 2946:
Nondestructive Evaluation of Bridges and Highways
Steven B. Chase, Editor(s)

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