Analysis and extraction of temperature effects on natural frequencies of a footbridge based on continuous dynamic monitoring

• Type: Article in International Conference Proceedings Book
• Date: 2009

Authors

Wei-Hua Hu (Author) FEUP; Carlos Moutinho (Author) FEUP; Filipe Magalhães (Author) FEUP; Elsa Caetano (Author) FEUP; Álvaro Cunha (Author) FEUP

Conference proceedings International

Title: IOMAC 2009, Ancona, Italy.

Pages: 55-62

IOMAC 2009

Ancona, Italy. , 2009

Indexing

Scopus - 8 Citations

Scientific classification

FOS: Engineering and technology > Civil engineering

Other information

Authenticus ID: P-009-RJH

Abstract (EN): The development of efficient vibration based structural health monitoring systems requires distinguishing between abnormal changes in modal parameters caused by structural damage and normal changes due to varying environmental conditions. In this context, this paper is focused on the analysis and extraction of effects of temperature oscillations on natural frequencies of a footbridge, where a long-term dynamic monitoring system was installed by the Laboratory of Vibrations and Monitoring of the Faculty of Engineering of University of Porto. With that purpose, firstly, the temperature influence on the natural frequencies is reported, and correlations between measured temperatures and estimated natural frequencies are analyzed. Then, the Principal Component Analysis (PCA) and the Novelty Detection method are applied to identified natural frequencies: PCA effectively eliminates environmental influence; Novelty analysis on the residual error of PCA predicted model is used as a statistical indication of damage. The proposed procedure is illustrated using continuous dynamic data collected from the footbridge during more than one year.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8