음압계측을 통한 트러스 구조물의 볼트 풀림 접합부 평가

초록

Vibration and acoustics travel through structure under the action of impact force at a position on the structure. The acoustic detection system comprises a microphone to capture the acoustic signatures of the vibrations. This work identifies the bolt-loosening joints to be used in truss structure using impact-acoustics approach. This work is originated from the observation that the sound pressure is deeply affected by the interaction between plates connected by bolts. The damage in the bolt joint can be detected based on the experimental data collected from impact hammer test using a microphone. It is observed that the bolt-loosening is appeared by the reduction of the resonance frequency due to the stiffness deterioration.

키워드