2838 圧電インピーダンス測定法によるトラス構造物におけるボルトの締め付け状態診断手法(S37-4 非破壊評価とモニタリング(4),S37 非破壊評価とモニタリング)

抄録

Infrastructures deteriorate with age and fracture for loads beyond the design criteria, age-related degradation, change of climate, etc. As one of the types of the damage, decreasing the fasten torque of a bolt have been reported. In order to prevent unexpected accidents, in this report, the loosening state of a bolt on a joint in the prototype structure is taken as the example of abnormality state and diagnosing method is proposed. Since the fastening state of bolts affects the mechanical impedance in the structure, PZT patches were embedded on the structure so that the mechanical impedance change can be measured precisely by the variation of the electric impedance in PZT patches. The experimental results show that this method has successfully detected all unusual states during the experiments.