Investigation on Damage Detection of Footbridges using Continuous Dynamic Monitoring Data

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2011

Autores

Hu, WH (Autor) Outra; Caetano, E. (Autor) FEUP; Cunha, A. (Autor) FEUP

Ata de Conferência Internacional

Título: PROCEEDINGS OF THE 8TH INTERNATIONAL CONFERENCE ON STRUCTURAL DYNAMICS, EURODYN 2011

Páginas: 1412-1419

8th International Conference on Structural Dynamics (EURODYN)

Leuven, BELGIUM, JUL 04-06, 2011

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00N-EJ6

Abstract (EN): The Laboratory of Vibrations and Structural Monitoring (ViBest) of FEUP has implemented, since 2007, two different continuous dynamic monitoring systems with remote control through Internet in two lively Portuguese footbridges: the Pedro e Ines footbridge, over Mondego river in Coimbra, and the stress-ribbon footbridge of FEUP Campus. This paper describes an investigation, developed on the basis of the monitoring data from those two bridges, with the purpose of demonstrating the feasibility of detecting damage using vibration data under normal operational conditions. This study shows that environmental and operational factors (e.g. temperature and pedestrian traffic) can induce linear or non-linear effects on the natural frequencies, which can mask subtle early damage. Taking into account linear relations between natural frequencies estimates of different modes, the Principal Component Analysis (PCA) is applied to remove those effects. Subsequently, Novelty Analysis on the residual errors of PCA builds a statistical damage indicator for long term structural health monitoring. The efficiency of the described damage detection methodology is evidenced by simulating some realistic damage scenarios based on previously tuned finite element models and observing the clear deviation of the damage indicator.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8