大ひずみ領域における不撹乱砂質・礫質土の変形特性

概要

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In order to evaluate the shear modulus ratio〜shear strain (G/Go〜γ) and hysteresis damping ratio〜shear strain (h〜γ) relations at large strain level, test results from a series of undramed cyclic deformation test and undramed cyclic strength test on undisturbed sand and gravel samples obtained by in-situ freezing method were reviewed Following were concluded (1) G/Go〜γ and h〜γ correlation from undramed cyclic strength test is basically corresponding to that obtained from undramed cyclic deformation test (2) In the range of strain level larger than 01%, the effect of confining stress or relative density on the G/Co〜γ and h〜γ relations at large strain level is slight (3) The deformation characteristics at large strain level used for equivalent linear analysis was evaluated with the normalized N value (Na) The response acceleration, obtained from equivalent linear analysis with the deformation characteristics proposed in this study, comparatively agreed with the observed record in Port Island during the 1995 Hyogo-ken Nanbu Earthquake.
社団法人日本建築学会の論文
2002-11-30