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| | Abstract | | The authors proposed a new method of non-destructive evaluation for residual load of ground anchors by using the frequency of free vibration of the tension length as a "string". Although the applicability of the method was confirmed at a real ground anchor slop, we didn't know if the tension length really vibrated as a string. This time, mock-up experiments were conducted to clarify the vibration characteristics of the tension length by using three different types of anchors and applying five different tensioning loads. We found that the frequency of the free vibration generated in the tension length is really the same as a string. This shows that we can estimate the tensioning load correctly from the frequency of free vibration of the tension length. In addition, we tried to measure the frequency by an accelerometer attached at the extra length of the anchor. We successfully measured the frequency by the trial in which the sweep generation stopped before measuring time so as to detect the small signals more clearly. |
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