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    Damage assessment of shear connectors with vibration measurements and power spectral density transmissibility

    Access Status
    Fulltext not available
    Authors
    Li, Jun
    Hao, Hong
    Xia, Y.
    Zhu, H.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, J. and Hao, H. and Xia, Y. and Zhu, H. 2015. Damage assessment of shear connectors with vibration measurements and power spectral density transmissibility. Structural Engineering and Mechanics. 54 (2): pp. 257-289.
    Source Title
    Structural Engineering and Mechanics
    DOI
    10.12989/sem.2015.54.2.257
    ISSN
    1225-4568
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE140101741
    URI
    http://hdl.handle.net/20.500.11937/17594
    Collection
    • Curtin Research Publications
    Abstract

    Shear connectors are generally used to link the slab and girders together in slab-on-girder bridge structures. Damage of shear connectors in such structures will result in shear slippage between the slab and girders, which significantly reduces the load-carrying capacity of the bridge. Because shear connectors are buried inside the structure, routine visual inspection is not able to detect conditions of shear connectors. A few methods have been proposed in the literature to detect the condition of shear connectors based on vibration measurements. This paper proposes a different dynamic condition assessment approach to identify the damage of shear connectors in slab-on-girder bridge structures based on power spectral density transmissibility (PSDT). PSDT formulates the relationship between the auto-spectral densities of two responses in the frequency domain. It can be used to identify shear connector conditions with or without reference data of the undamaged structure (or the baseline). Measured impact force and acceleration responses from hammer tests are analyzed to obtain the frequency response functions at sensor locations by experimental modal analysis.PSDT from the slab response to the girder response is derived with the obtained frequency response functions. PSDT vectors in the undamaged and damaged states can be compared to identify the damage of shear connectors. When the baseline is not available, as in most practical cases, PSDT vectors from the measured response at a reference sensor to those of the slab and girder in the damaged state can be used to detect the damage of shear connectors. Numerical and experimental studies on a concrete slab supported by two steel girders are conducted to investigate the accuracy and efficiency of the proposed approach. Identification results demonstrate that damages of shear connectors are identified accurately and efficiently with and without the baseline. The proposed method is also used to evaluate the conditions of shear connectors in a real composite bridge with in-field testing data.

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    • Damage detection of shear connectors in bridge structures with transmissibility in frequency domain
      Li, Jun; Hao, Hong; Xia, Y.; Zhu, P. (2014)
      Shear connectors are generally used to link the slab and girder together in slab-on-girder bridge structures. Damage of shear connectors in such structures will result in shear slippage between the slab and girder, which ...
    • Dynamic Assessment of Shear Connectors in Composite Bridges with Ambient Vibration Measurements
      Li, Jun; Hao, Hong; Zhu, H. (2014)
      Shear connectors are normally used in composite bridges, such as slab-ongirder structures, to link the slab and girder together. Damage of shear connectors will result in shear slippage between slab and girder, which ...
    • Damage detection of shear connectors based on power spectral density transmissibility
      Li, Jun; Hao, Hong (2013)
      Damage of shear connectors in slab-on-girder structures will result in shear slippage between slab and girder, which significantly reduces the load-carrying capacity of the bridge. This paper proposes a dynamic damage ...
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