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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Nonlinear site response and strain-dependent soil properties.
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Nonlinear site response and strain-dependent soil properties.

机译：非线性场地响应和应变相关的土壤特性。

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摘要

Vertical array records obtained during the 1995 Kobe earthquake were utilized to study seismic site amplification during destructive earthquakes. Spectrum ratios between ground surface and deeper levels were calculated for the main shock and associated small shocks to demonstrate the significant effect of soil nonlinear properties on site response. The records are back-calculated to evaluate in situ strain-dependent soil properties to be compared with laboratory test data. Shear moduli and damping ratios of soil layers to best reproduce the seismic response are back-calculated by means of an inversion analysis. Clear strain-dependent modulus degradations which can be differentiated for different soil types are recognized. The degradations and damping variations are essentially consistent with laboratory test results for each soil type, although further quantitative study is still needed, particularly for damping.
机译：利用1995年神户地震中获得的垂直阵列记录来研究破坏性地震期间的地震现场放大。计算了主震和相关的小震在地表和更深层之间的频谱比，以证明土壤非线性特性对场地响应的显着影响。对记录进行反算，以评估与应变相关的原位土壤特性，并与实验室测试数据进行比较。通过反演分析反算了最能再现地震响应的土层的剪切模量和阻尼比。认识到明显的应变相关的模量退化，可以针对不同的土壤类型进行区分。尽管仍需要进一步的定量研究，尤其是对于阻尼，但每种土壤的降解和阻尼变化与实验室测试结果基本一致。

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