Abstract
In-service condition assessment of large civil infrastructure systems has remained a particularly challenging area of research in the fields of nondestructive evaluation and structural health monitoring (SHM). Extensions of theoretically-based and laboratory verified vibration-based methods for assessing damage have been investigated experimentally on full-scale structures within several studies offering mixed conclusions. This paper introduces a recent experimental test program conducted on a full-scale bridge beam subjected to prescribed damage to the tension reinforcement. Details of the experimental testing program and vibration testing of the full-scale bridge beam both prior to and after damage to tension reinforcement are presented. System identification is applied to compare estimates of the natural frequencies, relative damping factors, and mode shapes obtained in the as-built state against those obtained after cutting over half of the tension reinforcement strands in the beam. A data-driven damage detection algorithm previously applied to detect damage in a full-scale bridge is also explored for application to the current dataset.
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Acknowledgements
The authors would like to acknowledge the technical support provided by the John Hillman, P.E., S.E., inventor of the HCB design, and the Thomas M. Murray Structures Laboratory at Virginia Tech. The beam testing and field implementation project was supported by the Virginia Center for Transportation Innovation and Research (VCTIR). The lead author’s participation in the research was partially supported by a North Carolina Space Grant Consortium Graduate Research Fellowship.
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© 2015 The Society for Experimental Mechanics, Inc.
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Kernicky, T.P., Whelan, M.J., Moen, C.D. (2015). Influence of Prestressing Strand Damage on Modal Parameters of a Hybrid Composite Bridge Beam. In: Caicedo, J., Pakzad, S. (eds) Dynamics of Civil Structures, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-15248-6_22
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DOI: https://doi.org/10.1007/978-3-319-15248-6_22
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