高振動数領域のフーリエ振幅を用いた局所損傷同定

抄録

This paper presents a localized damage identification technique for structures using Fourier amplitudes at high frequency. Structural damage is accompanied by changes in element stiffness. These changes alter dynamic characteristics of the structure, which provides useful information about the location and magnitude of damage. In most damage identification techniques using vibration measurements, stiffness changes of whole structural elements are unknowns to identify. Therefore, as the structures' size increases, the number of unknowns also increases and a large number of measurement data are necessary. The proposed technique reduces the number of unknowns to the stiffness reductions of a localized area by extracting localized vibration using high frequency excitation. The number of necessary measured data can also be reduced. The validity of the proposed technique is examined through the numerical study on a continuous girder bridge.