| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 93 === Wavelet analysis is a new time-frequency analytic technique which is developed in recent years. It becomes a key area of many researching due to its “Multiresolution Analysis” and its capability to reveal characters of partial signals in both time and frequency domain. In traditional beam member damage location identification, mode shapes of before and after damaged are used to calculate indices such as MSF(Modal Scale Factor), COMAC(Coordinate Modal Assurance Criterion), Modal Shape Deflection Method, MMC(Method of Modal Shape Curvature Change) etc.. But in real circumstance, it is difficult to obtain the mode shapes before damaged. Therefore this discourse presents a new damage location identification method, which combines both classical system identification method–Component Analysis and wavelet analysis. In this new method, the mode shapes of damaged structures are obtained by Component Analysis. Then the mode shapes are analyzed by wavelet transformation to get the positions of the damages by showing a peak in the distributions of the wavelet coefficients. We conduct lab experiment to recognize and discuss this new damage location identification method in this discourse.
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