2017 Volume 27 Issue 4 Pages 265-278
To establish a method for structural soundness diagnosis of concrete dams hit by earthquakes by focusing on changes in vibration characteristics of a dam body, time series of transfer functions calculated from seismic motion records obtained at the foundation and the crest of dams were analyzed. The results revealed that the natural frequency of several gravity dams hit by strong motions but suffered no obvious damages temporally decreased perhaps due to a behavior of transverse joints during earthquakes, while the analysis about an arch dam structurally damaged by a strong earthquake revealed that the natural frequency of the dam decreased discontinuously during the earthquake and did not recover even in later years.
