Seismic Effects on Vibration Characteristics of Concrete Dams

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  • KONDO Masafumi
    国土交通省 国土技術政策総合研究所 河川研究部 大規模河川構造物研究室
  • KOBORI Toshihide
    国土交通省 国土技術政策総合研究所 河川研究部 大規模河川構造物研究室
  • SASAKI Takashi
    国土交通省 国土技術政策総合研究所 河川研究部

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Other Title
  • 地震動がコンクリートダムの振動特性に及ぼす影響
  • ジシンドウ ガ コンクリートダム ノ シンドウ トクセイ ニ オヨボス エイキョウ

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<p>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.</p>

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