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Non-destructive Evaluation of Residual Tension of Ground Anchor Using Resonance Phenomenon

  • A. YashimaEmail author
  • H. Saito
  • K. Aoike
  • M. Yamazaki
  • Y. Sone
  • T. Wachi
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

A new method of non-destructive evaluation for residual tension load of ground anchors was developed. If the tendon tension part of a ground anchor is approximated by a “string”, the frequency of its free vibration is determined by line density and tension length of the PC steel and the operating tension. Although the free vibration of tendon tension part cannot be directly excited because it is in the ground, it is confirmed by a physical model experiment that the free vibration can be excited by applying a power at the extra length of anchor head. A series of field experiments was conducted by using a small vibrator and an accelerometer. A swept-frequency vibration was applied to the extra length of anchor head, and the vibration waveform was measured at the same position. The observed waveform was analyzed by running-spectrum analysis in order to find a resonance frequency which is used to calculate the residual tension load.

Keywords

Ground anchor Monitoring Resonance phenomenon 

References

  1. 1.
    Okubo, K., et al.: On the ground anchor in Expressway. Jpn. Road Assoc. Misc. 27, 15 (2007)Google Scholar
  2. 2.
    Japanese Society of Soil Mechanics and Foundation Engineering: Ground anchor design and construction standards, the commentary, pp. 13–15 (1988)Google Scholar
  3. 3.
    Sakai, T., et al.: The development of compact and lightweight maintenance jack and the investigation as the plane of ground anchor tension. Found. Work 38(9), 79–82 (2010)Google Scholar
  4. 4.
    Sakai, T., et al.: The evaluation of investigation of ground anchor slope as the plane by using SAAM jack. In: Proceedings of 65th Annual Scientific Society of Civil Engineers Conference, pp. 123–124 (2010)Google Scholar
  5. 5.
    Fujiwara, Y., Sakai, T.: A study of a lift-off test method for ground anchors. J. JSCE 4, 106–117 (2016)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • A. Yashima
    • 1
    Email author
  • H. Saito
    • 2
  • K. Aoike
    • 2
  • M. Yamazaki
    • 3
  • Y. Sone
    • 4
  • T. Wachi
    • 5
  1. 1.Gifu UniversityGifuJapan
  2. 2.OYO CorporationSaitamaJapan
  3. 3.Central Nippon Highway Engineering NagoyaNagoyaJapan
  4. 4.Nagoya UniversityNagoyaJapan
  5. 5.Nippon Expressway Research InstituteMachidaJapan

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