開口のある地中箱型構造物の地震時作用荷重および変形:-遠心力模型振動実験による三次元地震時挙動の評価-  [in Japanese] Seismic working load and deformation of a box-type underground structure with an opening:- Evaluation of three-dimensional seismic behavior by centrifuge model tests -  [in Japanese]

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Abstract

大規模発電所の取水施設などに設けられるポンプ室のような四面の側壁から囲まれた地中箱型構造物の耐震評価を行うには,構造物と地盤との相互作用を評価し,構造物の各部材に作用する荷重およびそれに伴う三次元的な変形を把握することが重要となる.今回,地中箱型構造物の耐震評価手法の確立を目的とした研究における実験的な検証を行うために,遠心力模型振動実験により側壁下部の一面に開口を設けた地中箱型構造物への作用荷重および変形の評価を行った.各構造部材に作用する荷重を直土圧,周面せん断力および慣性力に分類することで,入力波の段階載荷に伴う各作用荷重の増加およびその収束状況が明らかとなった.また構造物と地盤との相互作用を分析することで,捩じりを含む平面二方向の変形,および斜め方向入力による平面的に複雑な変形となる挙動を把握した.

To perform seismic evaluation of an underground box-type structure, such as pipe chambers of intake facilities in large-scale power plants with each side wall surrounded by soil, it is important to evaluate the interaction between the structure and the ground and understand the load acting on each member of the structure and the three-dimensional deformation associated with it. In this paper, with the purpose of experimental verification of a research aiming to establish a seismic evaluation method of underground box-type structures, evaluation of applied load and deformation on an underground box-type structure with an opening on lower part of one of its side wall surface is performed by using centrifuge model tests. As a result, increase of the applied load and its convergence situation due to gradual increase of the input motion has been revealed by classifying the load acting on each structural member. Furthermore, deformation mechanisms such as 2 directions planar deformation including torsion and planar complex deformation due to oblique direction input were found by analyzing the interaction between the structure and the ground.

Journal

  • Japanese Geotechnical Journal

    Japanese Geotechnical Journal 12(3), 323-336, 2017

    The Japanese Geotechnical Society

Codes

  • NII Article ID (NAID)
    130006108848
  • Text Lang
    JPN
  • Data Source
    J-STAGE 
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