抄録
This study is aimed at verifying the applicability of acoustic measurement to the detection of resonant frequencies of local vibrational modes of steel girder bridges for the efficient and quantitative structural condition assessment. Basic experiment using a girder specimen was conducted. It was firstly shown that the peak frequencies of local vibrational modes could be detected from the frequency spectra of hit sound of the specimen. In addition, the condition changes at bolt joints between the girder and the stiffner, which simulated typical damages in the girder bridges, could also be recognized by the resonant frequency changes that were detected by acoustic data. From those results, the acoustic data acquisition was expected to be applicable to realize efficient and quantitative maintainance of existing bridges.
