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Damage detection for truss bridge structures using correlation-based structural modal strain energy

Wang, Liang, Chan, Tommy H.T., Thambiratnam, David, & Tan, Andy (2010) Damage detection for truss bridge structures using correlation-based structural modal strain energy. In Bartlett, F. Michael (Ed.) Proceedings of the 8th International Conference on Short and Medium Span Bridges, The Canadian Society for Civil Engineering, Niagara Falls, Ontario, Canada, pp. 861-870.

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    Abstract

    This paper presents the feasibility of using structural modal strain energy as a parameter employed in correlation- based damage detection method for truss bridge structures. It is an extension of the damage detection method adopting multiple damage location assurance criterion. In this paper, the sensitivity of modal strain energy to damage obtained from the analytical model is incorporated into the correlation objective function. Firstly, the sensitivity matrix of modal strain energy to damage is conducted offline, and for an arbitrary damage case, the correlation coefficient (objective function) is calculated by multiplying the sensitivity matrix and damage vector. Then, a genetic algorithm is used to iteratively search the damage vector maximising the correlation between the corresponding modal strain energy change (hypothesised) and its counterpart in measurement. The proposed method is simulated and compared with the conventional methods, e.g. frequency-error method, coordinate modal assurance criterion and multiple damage location assurance criterion using mode shapes on a numerical truss bridge structure. The result demonstrates the modal strain energy correlation method is able to yield acceptable damage detection outcomes with less computing efforts, even in a noise contaminated condition.

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    ID Code: 34133
    Item Type: Conference Paper
    Additional URLs:
    Keywords: DAMAGE IDENTIFICATION, TRUSS STRUCTURES, CORRELATION-BASED METHOD, MODAL STRAIN ENERGY, DAMAGE SENSITIVITY
    ISBN: 9781617389900
    Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
    Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Infrastructure Engineering and Asset Management (090505)
    Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
    Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
    Past > Schools > School of Urban Development
    Copyright Owner: Copyright 2010 Please consult the authors.
    Deposited On: 16 Aug 2010 13:19
    Last Modified: 01 Mar 2012 00:17

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