Seismic working load and deformation of a box-type underground structure with an opening

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Other Title
  • 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－
  • - Evaluation of three-dimensional seismic behavior by centrifuge model tests -

Abstract

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.

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