Abstract
This study presents the monitoring and assessment technology of a large arch dam, the Fei-Tsui arch dam in Taiwan, from both seismic response data and ambient vibration measurement collected from a wireless sensing system. Subspace identification (considering inputs) and stochastic subspace identification (output-only) are both used to extract the dynamic characteristics of the dam. Variation of the system natural frequencies of the dam with respect to reservoir water level is investigated. The system transfer function between the earthquake input and the response of the dam body is also investigated using the ARX model. By combining ambient vibration survey, seismic response data, and static monitoring, the safety assessment of the dam structure can be made.
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