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Shock and Vibration
Volume 2014, Article ID 872492, 9 pages
http://dx.doi.org/10.1155/2014/872492
Research Article

Use of Time- and Frequency-Domain Approaches for Damage Detection in Civil Engineering Structures

1Faculty of Science, Technology and Communication, University of Luxembourg, 6 rue Richard Coudenhove-Kalergi, 1359 Luxembourg, Luxembourg
2Department of Aerospace and Mechanical Engineering, University of Liege, 1 Chemin des Chevreuils, B52, 4000 Liège, Belgium

Received 27 July 2013; Accepted 12 December 2013; Published 15 June 2014

Academic Editor: Nuno Maia

Copyright © 2014 V. H. Nguyen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this paper is to apply both time- and frequency-domain-based approaches on real-life civil engineering structures and to assess their capability for damage detection. The methodology is based on Principal Component Analysis of the Hankel matrix built from output-only measurements and of Frequency Response Functions. Damage detection is performed using the concept of subspace angles between a current (possibly damaged state) and a reference (undamaged) state. The first structure is the Champangshiehl Bridge located in Luxembourg. Several damage levels were intentionally created by cutting a growing number of prestressed tendons and vibration data were acquired by the University of Luxembourg for each damaged state. The second example consists in reinforced and prestressed concrete panels. Successive damages were introduced in the panels by loading heavy weights and by cutting steel wires. The illustrations show different consequences in damage identification by the considered techniques.