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    Health monitoring of joint conditions in steel truss bridges with relative displacement sensors

    235621_235621.pdf (979.3Kb)
    Access Status
    Open access
    Authors
    Li, Jun
    Hao, Hong
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, J. and Hao, H. 2015. Health monitoring of joint conditions in steel truss bridges with relative displacement sensors. Measurement. 88: pp. 360-371.
    Source Title
    Measurement: Journal of the International Measurement Confederation
    DOI
    10.1016/j.measurement.2015.12.009
    ISSN
    0263-2241
    School
    Department of Civil Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE140101741
    URI
    http://hdl.handle.net/20.500.11937/31816
    Collection
    • Curtin Research Publications
    Abstract

    This paper investigates the feasibility and effectiveness of using a recently developed relative displacement sensor for the structural health monitoring of joint conditions in steel truss bridges. The developed relative displacement sensor is an innovative design offering some advantages and unique features, and is a much easier and economical method for structural health monitoring due to the simplicity of its direct measurement of relative displacement without the requirement for a stable reference point. To investigate the performance of applying the developed relative displacement sensors for structural joint condition monitoring, a steel truss bridge model is fabricated in the laboratory and installed with the relative displacement sensors to detect the health conditions of joint connections. The dynamic relative displacement measurements are analyzed with a time-frequency analysis method, i.e. continuous wavelet transform, which is a well-practiced signal processing technique to identify the structural condition change, namely the loosen bolt damage in the joint connection of steel truss bridges under ambient vibrations. The sensitivity range of the developed sensor is also investigated to see how sensitive the sensor is to identify the local bolt damage. Relative displacement measurements of the steel truss bridge models under free vibration tests from both undamaged and damaged states are also analyzed, and a damage index based on the change in the percentages of a specific wavelet packet component to the total wavelet packet energy between the undamaged and damaged states is used to detect the existence of the loosen bolt damage in steel truss bridges. Experimental studies demonstrate that the developed relative displacement sensor has a sensitive performance to identify and assess the joint conditions in steel truss bridges.

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