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Bridge Pier Scour Measurement by Means of Bragg Grating Arrays: Laboratory Tests and Field Applications

  • F. Ballio
  • A. Cigada
  • G. Crotti
  • F. Inzoli
  • S. Manzoni
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

This paper deals with a new method to measure scour level at bridge piers. The proposed technique is based on an array of Bragg grating temperature sensors, heated by an electrical circuit. The Bragg gratings in water sense a lower temperature than those buried in the river bed, because of the different heat scattering principles in the two situations. Furthermore the response of each sensor is slower if it is buried in the bed, with respect to the case it is in water. The paper presents laboratory tests, showing the method effectiveness and reliability, and it explains the advantages with respect to other more traditional methodologies to measure scour level. Finally, the first field application is presented.

Keywords

Steady State Temperature Bridge Pier Bragg Wavelength Radio Frequency Interference Grating Pitch 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Ballio F, Orsi E, Time evolution of scour around bridge abutments, Water Engineering Research 2 4, 243-259, 2001.Google Scholar
  2. 2.
    National Cooperative Highway Research Program (NCHRP), Report 396 – Instrumentation for measuring scour at bridge piers and abutments, Transportation Board and National Research Council, 1997.Google Scholar
  3. 3.
    De Falco F, Mele R, The monitoring of bridges for scour by sonar and sedimetri, Independent Nondestructive Testing and Evaluation International 35 2, 117-123, 2002.Google Scholar
  4. 4.
    Radice S, Ballio F, A non-touch sensor for local scour measurements, Journal of hydraulic research 41 1, 105-108, 2003.CrossRefGoogle Scholar
  5. 5.
    Lin Y-B, Chen J-C, Chang K-C, Chern J-C, Lai J-S, Real-time monitoring of local scour by using fiber Bragg grating sensors, Smart Materials and Structures 14, 664-670, 2005.CrossRefGoogle Scholar
  6. 6.
    Lo K-F, Ni S-H, Huang Y-H, Zhou X-M, Measurement of unknown bridge foundation depth by parallel seismic method, Experimental Techniques 33 1, 23-27, 2009.CrossRefGoogle Scholar
  7. 7.
    Cigada A, Ballio F, Inzoli F, Hydraulic Monitoring Unit, application for international patent n. PCT/EP2008/059075, publication n. WO/2009/013151 (2009).Google Scholar
  8. 8.
    Hill KO, Meltz G, Fiber Bragg grating technology fundamentals and overview. Journal of Lightwave Technology 15 8, 1263-1276, 1997.CrossRefGoogle Scholar
  9. 9.
    James SW, Dockney ML, Tatam RP, Simultaneous independent temperature and strain measurement using in-fibre Bragg grating sensors. Electronics Letters 32 12, 1133-1134, 1996.CrossRefGoogle Scholar
  10. 10.
    Doebelin EO, Measurement systems: application and design, Fifth Edition (The McGraw-Hill Companies, 2004).Google Scholar

Copyright information

© Springer Science + Business Media, LLC 2011

Authors and Affiliations

  • F. Ballio
    • 1
  • A. Cigada
    • 2
  • G. Crotti
    • 1
  • F. Inzoli
    • 3
  • S. Manzoni
    • 2
  1. 1.D.I.I.A.R.Politecnico di MilanoMilanItaly
  2. 2.Department of MechanicsPolitecnico di MilanoMilanItaly
  3. 3.Department of EnergyPolitecnico di MilanoMilanItaly

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