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Published in:
2021 | OriginalPaper | Chapter
Evaluation of Ground Anchor Residual Tension by Vibration Method
Authors : Kazuki Nawa, Atsushi Yashima, Yoshinobu Murata, Keizo Kariya, Hideki Saito, Kunio Aoike, Yoshinori Sone, Mitsuru Yamazaki
Published in: Advances in Sustainable Construction and Resource Management
Publisher: Springer Singapore
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Abstract
A new method of non-destructive evaluation for residual tensile load of ground anchor has been developed. If the tendon tension part of a ground anchor is approximated by a “string” or “beam”, the frequency of its free vibration is determined by line density and tendon 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.