Abstract Characterizing the potential effect of local site conditions on the amplification of ground motions is a critical aspect of seismic hazard and risk assessment. The aim of this study is to investigate the reliability and the limit of using the average shear wave velocity in the upper 30 m of the soil profile v s , 30 , as single proxy, to characterize seismic site effects for weak and strong events. To this regard, a dataset of 300 one-dimensional soil profiles with a given v s , 30 are generated through a Monte Carlo approach. Their seismic responses are computed for a set of 40 real accelerograms, with different seismic features. The vertical propagation from the bottom of the generated columns is modeled using a finite element spatial discretization, accounting for both linear and nonlinear soil behavior. The site dominant frequency f 0 and the shear wave velocity gradient in the profile B 30 are proposed as proxies to characterize seismic site effects and the variability of the response spectra for the numerical signals, at the free surface of the set of columns, is discussed. Correlations between site-specific amplification factors deduced using the numerical response spectra and the proposed site proxies are analyzed for different sub-ranges of periods. The obtained amplification factors are then compared to those proposed by different international and national design codes. The results, obtained under assumption of linear and nonlinear behavior of soil, emphasize the need to introduce complementary site parameters proxies, in addition to v s , 30 , to characterize the expected site effects in design response spectra.

中文翻译：

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土壤剖面性质变异性对弱强地震反应的影响

摘要 表征当地场地条件对地震动放大的潜在影响是地震灾害和风险评估的一个关键方面。本研究的目的是研究使用土壤剖面上部 30 m 与 30 的平均剪切波速度作为单一代理来表征弱事件和强事件的地震现场效应的可靠性和限制。在这方面，通过蒙特卡罗方法生成了 300 个具有给定 vs 的一维土壤剖面的数据集，30。他们的地震响应是针对一组 40 个具有不同地震特征的真实加速度图计算的。从生成的柱子底部的垂直传播使用有限元空间离散化建模，同时考虑了线性和非线性土壤行为。提出了站点主频率 f 0 和剖面 B 30 中的剪切波速度梯度作为表征地震站点效应的代理，并讨论了在一组柱子的自由表面处数值信号的响应谱的可变性. 针对不同的周期子范围分析了使用数值响应谱推导出的特定于站点的放大因子与建议的站点代理之间的相关性。然后将获得的放大系数与不同的国际和国家设计规范提出的放大系数进行比较。在土壤的线性和非线性行为假设下获得的结果强调需要引入互补的场地参数代理，除了 vs , 30 ，以表征设计响应谱中的预期场地效应。