ABSTRACT
This study aims to investigate change in vibration characteristics of full-scale poled structure made of steel by vibration test. Due to the cyclic loading, the poled structures are susceptible to failure resulting from the damages such as cracks or loosened bolts. As the fundamental study for the development of SHM technique, cyclic vibration test using exciter was conducted on the structure and relationship conditions and identified vibration characteristics were discussed. Additionally, data with loosening anchor bolts were also collected to simulate the damage on the base. The experimental result shows that natural frequency decreases with increasing the degree of damage. Besides, it was found that two vibration modes with close natural frequencies were identified as one when the structure was intact, but were separated into two modes when the support conditions changed.
