地震直後対応としての鋼構造物における亀裂の簡易な存否判定のための基礎的検討

抄録

It is very important to find small damages such as cracks on steel structure with less works. Because, for example, we have to detect quickly the health level of structures after a big earthquake. For this purpose, we propose a method using the Hilbert spectrum which is a time-frequency distribution obtained from the Hilbert-Huang transform. To discuss the applicability of the proposed method we carried out some experiments and found that the waves with higher frequencies show more quick damping than waves with lower frequencies for damaged steel plates. Consequently, this suggests that we can possibly detect the damages from the damping of waves in high frequency range.