当前位置: X-MOL 学术Nucl. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of Soil Properties and Input Motion on Site Amplification Using Validated Nonlinear Soil Model
Nuclear Technology ( IF 1.5 ) Pub Date : 2021-08-23 , DOI: 10.1080/00295450.2021.1920798
Samyog Shrestha 1 , Efe G. Kurt 2 , Kyungtae Kim 2 , Arun Prakash 1 , Ayhan Irfanoglu 1
Affiliation  

Abstract

Three-dimensional (3-D) nonlinear site response analyses are conducted using finite element models of actual soil profiles from ten nuclear power plant (NPP) sites in the United States to investigate the effects of soil properties and input motions on site amplification. The modeling approach developed in this study combines several novel elements, such as 3-D analysis (including vertical motions), nonlinear inelastic behavior of soil (strain-dependent shear modulus reduction and hysteretic damping), formulation of nonreflecting boundary conditions at the base, and generation of realistic outcrop ground motions for specific sites. All these elements of the modeling approach are first validated using actual data from five earthquakes at three downhole array stations recorded in the Kiban-Kyoshin network (KiK-net), Japan. The same approach is then used to develop site models of ten NPP sites in the United States and corresponding ground motions that are spectrally matched to the site hazard spectra. Eight sets of three-component input motions are used in the study and are categorized on the basis of presence or absence of a near-field pulse in the seed ground motions used for spectral matching. It is found that all sites retain a definite site amplification function regardless of the input motion, provided that the seed motion is spectrally matched to the site hazard spectra. The magnitude of site amplification and frequencies at which they occur depend upon soil properties, particularly the shear wave velocity profile and the constitutive relationship (strain-dependent shear modulus reduction and hysteretic damping) of soil. Amplification of spectral acceleration in the vertical direction (up-down motion) is found to be just as much as, if not more than, the amplification in the horizontal direction. Peak shear strain is found to be about 20% larger for near-field motions compared to far-field motions whereas maximum horizontal site amplification for far-field motions is found to be consistently larger than that of near-field motions, even though the differences between the two remain within the scatter resulting from individual ground motions.



中文翻译:

使用经验证的非线性土壤模型,土壤特性和输入运动对场地放大的影响

摘要

三维 (3-D) 非线性场地响应分析使用来自美国十个核电站 (NPP) 场地的实际土壤剖面的有限元模型进行,以研究土壤特性和输入运动对场地放大的影响。本研究中开发的建模方法结合了几种新颖的元素,例如 3-D 分析(包括垂直运动)、土壤的非线性非弹性行为(应变相关的剪切模量降低和滞后阻尼)、底部非反射边界条件的公式化、并为特定地点生成逼真的露头地面运动。建模方法的所有这些元素首先使用日本 Kiban-Kyoshin 网络 (KiK-net) 中记录的三个井下阵列站的五次地震的实际数据进行验证。然后使用相同的方法开发美国 10 个核电厂场址的场址模型,以及与场址危险谱谱匹配的相应地面运动。研究中使用了八组三分量输入运动,并根据用于光谱匹配的种子地面运动中是否存在近场脉冲进行分类。发现无论输入运动如何,所有站点都保留确定的站点放大函数,前提是种子运动在光谱上与站点危险谱匹配。场地放大的幅度和它们发生的频率取决于土壤特性,特别是剪切波速度剖面和土壤的本构关系(应变相关剪切模量降低和滞后阻尼)。发现垂直方向(上下运动)上的频谱加速度的放大与水平方向上的放大一样多,甚至更多。发现与远场运动相比,近场运动的峰值剪切应变大约大 20%,而发现远场运动的最大水平位置放大始终大于近场运动的最大水平位置放大,即使存在差异两者之间保持在由个别地面运动引起的散射范围内。

更新日期:2021-09-28
down
wechat
bug