側面地盤の浮き上がり拘束効果を考慮した埋込み地盤ばねに関する研究

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  • 鈴木 琢也
    竹中工務店技術研究所　研究主任・博士（工学）
  • 猪田 幸司
    関西電力原子力事業本部　修士（工学）
  • 中村 尚弘
    広島大学大学院工学研究科　教授・博士（工学）
  • 藤原 悠祐
    関西電力原子力事業本部　修士（工学）

書誌事項

タイトル別名
  • EMBEDDED SOIL SPRING MODEL CONSIDERING UPLIFT CONSTRAINT EFFECT OF SIDE SOIL
  • 側面地盤の浮き上がり拘束効果を考慮した埋込み地盤ばねに関する研究 : 硬質岩盤に基礎が埋め込まれた場合の検討
  • ソクメン ジバン ノ ウキアガリ コウソク コウカ オ コウリョ シタ ウメコミ ジバンバネ ニ カンスル ケンキュウ : コウシツ ガンバン ニ キソ ガ ウメ コマレタ バアイ ノ ケントウ
  • 硬質岩盤に基礎が埋め込まれた場合の検討
  • The case of embedded foundation in hard-rock

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抄録

 For seismic design for embedded large structure, evaluation of soil-structure interaction is very important. However, the effect that embedded side soil gives structure uplift behavior is not clear.<br> In this paper, uplift constraint mechanism of side soil is examined. And, new modeling method for seismic response analysis of embedded structure is proposed. First, to confirm the accuracy of embedded SR model considering side rocking spring, seismic response analysis of reactor building is conducted by soil FE model and traditional embedded SR model. Then, by static uplift analysis of rigid foundation, it is clear the difference between both models in uplift behavior. And then, considering this difference, a new modeling method is proposed. The validity of this proposed method is confirmed by static and dynamic analysis by comparing from result of FE model.<br><br> The Results obtained from this study are summarized as follows.<br> (1) In embedded SR model with Novak side soil spring, by considering rocking side soil spring, the building response result of analysis comes to match that of soil FE model. And at the point of view of uplift behavior evaluation, embedded SR model with Novak rocking side soil spring make safe side evaluation, when the result of soil FE model is assumed to be true.<br><br> (2) There are two reasons why there is the difference between the uplift evaluation between embedded SR model with Novak horizontal and rocking spring and soil FE model. One is that interaction of soil stiffness between the side soil stiffness and bottom soil is not considered. The other is that vertical constraint effect of side soil is not considered. By considering these effects, the result of embedded SR model comes to match that of soil FE model.<br><br> (3) The proposed embedded SR model makes safe side evaluation of uplift behavior when the result of soil FE model is assumed to be true.

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