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首页> 外文期刊>Bulletin of earthquake engineering >Centrifuge modeling of seismic response of layered soft clay
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Centrifuge modeling of seismic response of layered soft clay

机译：分层软粘土地震反应的离心建模

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Centrifuge modeling is a valuable tool used to study the response of geotechnical structures to infrequent or extreme events such as earthquakes. A series of centrifuge model tests was conducted at 80g using an electro-hydraulic earthquake simulator mounted on the C-CORE geotechnical centrifuge to study the dynamic response of soft soils and seismic soil-structure interaction (SSI). The acceleration records at different locations within the soil bed and at its surface along with the settlement records at the surface were used to analyze the soft soil seismic response. In addition, the records of acceleration at the surface of a foundation model partially embedded in the soil were used to investigate the seismic SSI. Centrifuge data was used to evaluate the variation of shear modulus and damping ratio with shear strain amplitude and confining pressure, and to assess their effects on site response. Site response analysis using the measured shear wave velocity, estimated modulus reduction and damping ratio as input parameters produced good agreement with the measured site response. A spectral analysis of the results showed that the stiffness of the soil deposits had a significant effect on the characteristics of the input motions and the overall behavior of the structure. The peak surface acceleration measured in the centrifuge was significantly amplified, especially for low amplitude base acceleration. The amplification of the earthquake shaking as well as the frequency of the response spectra decreased with increasing earthquake intensity. The results clearly demonstrate that the layering system has to be considered, and not just the average shear wave velocity, when evaluating the local site effects.
机译：离心机建模是一种有价值的工具，用于研究岩土结构的响应，越野或地震等极端事件。使用安装在C芯岩土地区离心机的电液压模拟器，在80g下进行了一系列离心机模型试验，以研究软土和地震土结构相互作用（SSI）的动态响应。使用土壤床和其表面的不同位置的加速度记录以及表面的沉降记录分析软土地震反应。此外，使用部分嵌入土壤中的基础模型表面的加速度记录来研究地震SSI。离心机数据用于评估剪切模量和阻尼比与剪切应变幅度和限制压力的变化，并评估它们对现场反应的影响。使用测量的剪切波速度，估计模量减少和阻尼比作为输入参数的站点响应分析产生了与测量的现场响应的良好一致性。结果的光谱分析表明，土壤沉积物的刚度对输入运动的特征和结构的整体行为产生显着影响。在离心机中测量的峰表面加速度显着放大，特别是对于低幅度基础加速度。随着地震强度的增加，地震摇动的放大以及响应光谱的频率降低。结果清楚地表明，在评估本地站点效应时，必须考虑分层系统，而不仅仅是平均剪切波速度。

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