ABSTRACT
This study aims to investigate a way of estimating natural frequencies and detecting damage of a full-scale pole structure by means of video footage as a preliminary investigation. The accuracy of estimated frequency from a processed video are compared with the identified results by accelerometers installed on the structure. Furthermore, loosening states of the anchor bolt as a damaged scenario are also recorded for the assessment of damage detection. A phase-based motion magnification method is used for visualizing the mode shapes of the target pole. Then, its vibration is extracted using the Kanade-Lucas-Tomasi Tracker that is one of the optical flow method to track the featured points from the processed video. Changes in estimated natural frequencies at all damaged data were observed, which shows the possibility of the proposed approach for damage detection of the target pole although the accuracy of estimated natural frequencies needs improvement.
