ANALYTICAL STUDY ON DAMAGE FACTOR OF PILE FOUNDATIONS DURING THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

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  • 東北地方太平洋沖地震における杭基礎の被害要因に関する解析的検討
  • トウホク チホウ タイヘイヨウオキ ジシン ニ オケル クイ キソ ノ ヒガイ ヨウイン ニ カンスル カイセキテキ ケントウ

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 The authors carried out static analyses using a foundation structure model in order to simulate the process leading to distinctive damage of pile foundations during the 2011 off the Pacific coast of Tohoku earthquake. Remarkable points of the proposed method were evaluation of nonlinear load-deformation characteristics of pile element and rotational stiffness at pile head depended on axial force and formulation of nonlinear behaviors of soil spring including group pile effect. Results obtained from the analysis in two stages to the process to failure of piles for each loading direction explain fairly well the actual damage of pile foundations. The proposed method can be considered as a practical seismic design method of foundations for severe earthquakes.

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