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首页> 外文期刊>Bulletin of earthquake engineering >2D equivalent linear site effect simulation: example applications to two deep valleys
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2D equivalent linear site effect simulation: example applications to two deep valleys

机译：二维等效线性场效应模拟：两个深谷的示例应用

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In the framework of the Sismovalp European project, an equivalent linear 2D code was developed to compute the response of a valley to SH waves, using the discrete wave-number method proposed by Aki and Larner (Aki K, Larner KL (1970) J Geophys Res 75:5). To overcome the frequency upper bound limitation, the Aki and Larner's method is combined with a one-dimensional computation using a classical multi-layer method (Aki K, Richards PG (1980) Quantitative Seismology: Theory and Methods, vols. 1 & 2. W.H. Freeman & Co, San Francisco). The so-called "Aki-Larner extended method" is associated to an iterative algorithm, as proposed by Seed and Idriss (Seed HB, Idriss IM (1969) Report No. EERC 70-10, Earthquake Research Center, University of California, Berkeley, California) which accounts for the modulus and damping degradation using a linear visco-elastic model. A comparison of the results in the linear and the equivalent linear cases, for a magnitude 6.0 earthquake, shows that the account for the equivalent linear behaviour of the soil significantly reduces the amplification level, especially at frequencies higher than the fundamental resonance frequency of the site. In the case of site effects or microzonation studies devoted to produce design spectra for engineering structures, this can have a major impact on the associated results and costs, depending on the frequency of interest for the considered structure. As a first application of the developed technique, 2D equivalent linear Aki-Larner computations are used to perform the seismic microzonation study of the upper Rhone valley, in the Visp area (Switzerland), a typical 2D alpine valley. These investigations made it possible to determine site specific spectra, associated with different zones, to be used instead of the code spectra that do not take into account the local 2D amplification.
机译：在Sismovalp欧洲项目的框架中，使用Aki和Larner（Aki K，Larner KL（1970）J Geophys提出的离散波数方法，开发了等效的线性2D代码来计算波谷对SH波的响应。决议75：5）。为了克服频率上限限制，将Aki和Larner方法与使用经典多层方法的一维计算相结合（Aki K，Richards PG（1980）定量地震学：理论与方法，第1和第2卷。 WH Freeman＆Co，旧金山）。如Seed和Idriss（Seed HB，Idriss IM（1969）报告编号EERC 70-10，加利福尼亚大学伯克利分校地震研究中心）所述，所谓的“ Aki-Larner扩展方法”与迭代算法相关。 （加利福尼亚州），使用线性粘弹性模型解释了模量和阻尼衰减。对6.0级地震的线性和等效线性情况下的结果进行比较，结果表明，考虑到土壤的等效线性行为，显着降低了放大水平，尤其是在高于现场基本共振频率的频率下。对于专门为工程结构生成设计图谱的场地效应或微区研究而言，这可能会对相关结果和成本产生重大影响，具体取决于所考虑结构的关注频率。作为已开发技术的首次应用，二维等效线性Aki-Larner计算被用于在典型的2D高寒山谷维斯普地区（瑞士）的上罗纳河谷进行地震微带化研究。这些研究使得可以确定与不同区域关联的特定于站点的光谱，而不是不考虑局部2D放大的代码光谱。

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