Abstract
Infrastructures in Japan are showing serious signs of progressive deterioration. A non-destructive inspection technique for structural members is needed. Determining the locations of damage in structural members is critical to maintain them safely. In this study, a damage identification method based on anti-resonance frequency is investigated. Harmonic vibration response analysis of concrete beam specimens revealed that anti-resonance frequencies are decreased by cracks. In forced vibration tests (frequency sweep tests), the location of cracks in these specimens could be determined by the anti-resonance frequency change. Moreover, from forced vibration tests of actual concrete and steel road bridges using a portable electric shaker, it was indicated that the anti-resonance frequencies of such structures could be measured.
