Attempt of structural health monitoring of aged arch dam through detection of predominant frequency variation over time by means of long-term continuous observation of ambient vibration/seismic motion

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In order to grasp predominant frequencies and their variations over time, including the ones during and/or before/after seismic events, long-term continuous observation of ambient vibration/seismic motion was performed at the crest of an aged arch dam, which revealed the following; 1) Structural health of the observed dam is able to be evaluated by means of predominant frequency monitoring obtained through long-term continuous observation of ambient vibration. 2) It was objectively shown by the numerical value of predominant frequency that the structural health of the dam was maintained even after experiencing the 2011 Off the Pacific Coast of Tohoku Earthquake and lots of its large-scale aftershocks. 3) That the predominant frequency stayed unchanged means that structural health of the dam was confirmed to be maintained, and that the seismic load was confirmed to stay unchanged, which showed that the back-check of the dam after experiencing the big earthquakes was unnecessary.