地震記録および非線形応答解析を用いた地盤分類別の地盤増幅率の評価

概要

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Site amplification characteristics are indispensable for evaluating strong ground motions at specific sites. Theoretical methods, such as 1-D wave propagation analysis, are often employed for this purpose. However, prerequisite structures are not necessarily obtained with ease. On the other hand, average shear-wave velocity of ground from surface to 30m depth (V30) showed higher correlation with the amplification factor. In this paper, we applied site classification scheme based on definitions of seven site classes in terms of V30. We evaluated site amplification factors, Fa for short periods and Fv for longer periods, as a function of peak ground acceleration on bedrock based on strong ground motion records and nonlinear response analysis. The results show that the factor of Fa decreases as peak ground acceleration increases because of nonlinear soil behavior, however, the factor of Fv shows only a weak dependence on peak ground acceleration.
2003-09-30