RESEARCH ARTICLE


Dynamic Identification Techniques to Numerically Detect the Structural Damage



Dora Foti*
Technical University of Bari, Department of Civil Engineering and Architecture, Via Orabona 4, 70125 Bari, Italy.


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Creative Commons License
© 2013 Dora Foti ;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Technical University of Bari, Department of Civil Engineering and Architecture, Via Orabona 4, 70125 Bari, Italy; Tel: +39-080-5963771; Fax: +39-080-5963719; E-mail: d.foti@poliba.it


Abstract

Damage detection in civil engineering structures using changes in measured modal parameters is an area of research that has received notable attention in literature in recent years. In this paper two different experimental techniques for predicting damage location and severity have been considered: the Change in Mode Shapes Method and the Mode Shapes Curvature Method. The techniques have been applied to a simply supported finite element bridge model in which damage is simulated by reducing opportunely the flexural stiffness EI. The results show that a change in modal curvature is a significant damage indicator, while indexes like MAC and COMAC – extensively and correctly used for finite element model updating - lose their usefulness in order to damage detection.

Keywords: Structural damage detection, dynamic identification, mode shapes, modal curvatures.