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発表 Dynamic Analysis of Seismic Behavior of Raised Concrete Gravity Dam during Large Earthquake

作成年度 2014 年度
論文名 Dynamic Analysis of Seismic Behavior of Raised Concrete Gravity Dam during Large Earthquake
論文名(和訳)
論文副題
発表会 82th ICOLD annual meeting
誌名 Proceedings of ICOLD International symposium on global environmental challenges
巻・号・回 Sub Theme Ⅱ
発表年月日 2014/06/02 ~ 2014/06/06
所属研究室/機関名 著者名(英名)
水工研究グループ水工構造物チームMasafumi KONDO
水工研究グループ水工構造物チームTakayuki Shida
水工研究グループ水工構造物チームYasufumi Enomura
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Takashi Sasaki
抄録
Raising the height of existing dams can be one of the most effective solutions to meeting the changing needs of flood control and water use in river basins. Meanwhile, evaluating the structural safety of dams against large scale earthquakes is one of the most important issues in the construction of new dams and the sustenance of existing dams. In this paper, the seismic behavior of raised concrete gravity dams during large scale earthquakes is investigated through the use of numerical simulations, including a linear analysis and a non-linear dynamic analysis that considers the crack propagation accompanied by tension softening of dam concrete. The analyses revealed that the damage caused to a raised concrete gravity dam resulting from a large earthquake is not the same as that of a newly constructed dam with the same shape. Further, it was determined that the damage depends on the height of dam raising and the water level of the reservoir during the raising work. Based on these results, it was pointed out that when evaluating the effect of seismic motion on a raised concrete gravity dam through the use of dynamic analysis, the process of raising work, including the placement of new concrete, and the actual water level of the reservoir during the raising work should be properly taken into consideration.
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