Use of modal flexibility for damage detection and condition assessment: Case studies and demonstrations on large structures

    Authors

    F. N. Catbas; D. L. Brown;A. E. Aktan

    Comments

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    Abbreviated Journal Title

    J. Struct. Eng.-ASCE

    Keywords

    damage; flexibility; modal analysis; monitoring; displacement; dynamics; ISSUES; Construction & Building Technology; Engineering, Civil

    Abstract

    Displacement coefficients and profiles are presented as promising kernel condition and damage indices along with real-life examples. It is shown that dynamic tests, which do not require stationary reference measurement locations, can also be used to generate data for the computation of modal flexibility. Modal flexibility can then be employed to obtain the displacement profiles. It is also shown that the modal flexibility can be obtained from the frequency response function measurements of the structures. Problems such as environmental effects on measured data and limitations such as incomplete dynamic measurements, spatial and temporal truncation effects are commonly faced in damage detection and condition assessment of real structures. Possible approaches to mitigate these obstacles are discussed. The level of variation and the uncertainty that may be expected when displacement coefficients are extracted from real civil infrastructure systems are also presented. The methods are demonstrated on two real-life bridges and the findings are validated by independent test results.

    Journal Title

    Journal of Structural Engineering-Asce

    Volume

    132

    Issue/Number

    11

    Publication Date

    1-1-2006

    Document Type

    Article

    Language

    English

    First Page

    1699

    Last Page

    1712

    WOS Identifier

    WOS:000241603600003

    ISSN

    0733-9445

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