Conceptual damage-sensitive features for structural health monitoring: Laboratory and field demonstrations

    Authors

    F. N. Catbas; M. Gul;J. L. Burkett

    Comments

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    Abbreviated Journal Title

    Mech. Syst. Signal Proc.

    Keywords

    structural health monitoring; modal flexibility; modal curvature; damage; detection; dynamics; PARAMETER-ESTIMATION; MODAL FLEXIBILITY; IDENTIFICATION; ISSUES; BRIDGE; Engineering, Mechanical

    Abstract

    The use of damage-sensitive features to evaluate structural condition or health is a very critical aspect of structural health monitoring. The purpose of this paper is to investigate the potential of two different damage-sensitive features for detecting damage. Different damage scenarios are simulated on a large-scale laboratory structure and a three-span highway bridge for demonstration. The features presented in this paper are the modal flexibility-based deflection and curvature both of which are obtained directly from dynamic properties. In the literature, flexibility associated with mode shapes and mode shapes curvatures have been mostly explored. In this study, multi-input-multi-output dynamic data are used to obtain modal flexibility, which is a close approximation to the actual flexibility. A main novelty is that the curvature is calculated from the deflected shapes using the modal flexibility as opposed to using modal vectors. In this paper, the theory of the methodology is explained and then experimental studies and results are presented. For the experimental studies, the laboratory specimen and the three-span bridge were gradually damaged. It is shown that both deflection and curvature are conceptual and physically meaningful features for damage detection and localization. The issues and the requirements for these features to perform successfully are also presented. (C) 2008 Elsevier Ltd. All rights reserved.

    Journal Title

    Mechanical Systems and Signal Processing

    Volume

    22

    Issue/Number

    7

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    1650

    Last Page

    1669

    WOS Identifier

    WOS:000257866600010

    ISSN

    0888-3270

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