局所フレキシビリティ指標に基づく柱状構造物の簡易診断法

抄録

A simplified screening method for a pole structure such as electric pole, light pole, signal pole, etc., using a modal-based evaluation of structural local flexibility is proposed in this paper. A ratio of the rotational local flexibility of the healthy part to that of the potentially damaged root part is adopted as a damage index, and its approximate calculation scheme is proposed. Using the proposed method, one may quantitatively evaluate the extent of the damages in the root part of the pole by conducting a vibration test identifying the first few modes. Experiments using a scaled pole specimen made of a vinyl chloride pipe shows that a transversal cut in the root of the pole specimen whose depth is 15 % of the diameter can be detected by using the proposed method.