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Dynamic behaviors of building 30 severely deteriorated and damaged are investigated by processing acceleration data acquired by the vibration sensor network in Gunkanjima. Long-term and shortterm variations of the vibrational characteristics of building 30 have been evaluated by singular value decomposition and spectrogram, respectively. It is observed that predominant frequencies change unsteadily as a time-variant system depending on damage evolution and external environment during long-term and short-term monitoring even in normal time.

VIBRATION SENSING OF BUILDING 30 SEVERELY DETERIORATED AND DAMAGED IN GUNKANJIMA