Investigations for detection of base displacement in existing transmission towers

Abstract

The social infrastructure structure which was built for the rapid economic growth period becomes deterioration. Load bearing deterioration of existing transmission towers due to aging is estimated by periodic inspections and numerical analyses. However, efficient classification of the deterioration level is inevitably requested, since a lot of anxious towers may exist.This study is intended to evaluate the aging deterioration phenomenon of the transmission tower from vibration characteristic. The representative of deterioration phenomenon is loose bolt , material corrosion and basic displacement in transmission tower, and aimed at the detection of the basic displacement using a high resolution camera and an accelerometer.

In this paper, we simulated the member corrosion and base displacement of transmission tower, then analyzed to what extent it will affect the vibration characteristics of the tower.In addition, we also analyzed the change in vibration characteristics of a transmission tower that was actually diagnosed with base displacement. Then, by utilizing high-resolution camera and accelerometer to measure the vibration characteristics of the diagnosed tower, it was verified that the analysis results were consistent with the actual vibration characteristics.