Evaluation of strong motion and fragility curve along Nagamachi Viaduct for the 2011 off the Pacific coast of Tohoku Earthquake based on SPGA model considering empirical site amplification and phase effects

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  • SPGAモデルと経験的サイト増幅・位相特性を考慮した2011年東北地方太平洋沖地震における長町高架橋での地震動とフラジリティカーブの評価
  • SPGA モデル ト ケイケンテキ サイト ゾウフク ・ イソウ トクセイ オ コウリョ シタ 2011ネン トウホク チホウ タイヘイヨウオキ ジシン ニ オケル チョウチョウ コウカケハシ デ ノ ジシンドウ ト フラジリティカーブ ノ ヒョウカ

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Abstract

During the 2011 off the Pacific coast of Tohoku Earthquake, Nagamachi Viaducts on the Tohoku Shinkansen Line, Sendai City, Miyagi Prefecture, Japan, suffered significant damage. In order to analyze the damage mechanism, it is important to evaluate strong ground motions at the viaduct sites with high accuracy, taking into account site effects. In this study, seismic waveforms along the viaduct were estimated based on the SPGA model considering empirical site amplification and phase effects. Using the actual damage data and detailed distribution of the estimated ground motion, this study conducts the statistical analysis on the relationship between the damage ratio and several indices of the ground motion to construct fragility curves. The estimated ground motions and fragility curves will be useful in the detailed study of the damage mechanism.

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