Challenges in the application of stochastic modal identification methods to a cable-stayed bridge

• Type: Article in International Scientific Journal
• Date: 2007

Authors

magalhaes, f (Author) FEUP; caetano, e (Author) FEUP; cunha, a (Author) FEUP

Journal

Title: Journal of Bridge Engineering

Vol. 12 No. 6

Pages: 746-754

ISSN: 1084-0702

Publisher: ASCE

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 40 Citations

Other information

Authenticus ID: P-004-6HY

DOI: 10.1061/(asce)1084-0702(2007)12:6(746)

Abstract (EN): This paper presents an analysis of the data collected in the ambient vibration test of the International Guadiana cable-stayed Bridge, which links Portugal and Spain, based on different output-only identification techniques: peak-picking, frequency domain decomposition, covariance-driven stochastic subspace identification, and data-driven stochastic subspace identification. The purpose of the analysis is to compare the performance of the four techniques and evaluate their efficiency in dealing with specific challenges involved in the modal identification of the tested cable-stayed bridge, namely the existence of closely spaced modes, the perturbation produced by the local vibration of stay-cables, and the variation of modal damping coefficients with wind velocity. The identified natural frequencies and mode shapes are compared with the corresponding modal parameters provided by a previously developed numerical model. Additionally, the variability of some modal damping coefficients is related with the variation of the wind characteristics and associated with a component of aerodynamic damping.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9