有限要素法地震応答解析 : ケーススタディに見る長所と問題点(<小特集テーマ>地盤工学におけるFEMの設計への適用)

概要

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Advantage and disadvantage of the finite element earthquake response analysis are investigated through a case study of the pile damaged during the 1995 Kobe earthquake. Estimated by finite element analysis showed more possibility of damage than conventional design equation because defomation mechanism must be assumed in the latter whereas it is automatically derived by FEM. At the same time, however, FEM misleads damage when total stress analysis is employed; bending moment in the liquefied layer is evaluated to small and that at the boundary between soft and hard deposits is overestimated. Since analysis in which ground displacement is evaluated by effective stress analysis explained fire damage pattern of the pile, importance to use relevant method is emphasized In conclusion, the finite element method is shown to be powerful tool if it is used correctly.
2005-08-01