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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Comparison of 1D linear, equivalent-linear, and nonlinear site response models at six KiK-net validation sites
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Comparison of 1D linear, equivalent-linear, and nonlinear site response models at six KiK-net validation sites

机译：在六个KiK-net验证站点上比较一维线性，等效线性和非线性站点响应模型

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摘要

Vertical seismometer arrays represent a unique interaction between observed and predicted ground motions, and they are especially helpful for validating and comparing site response models. In this study, we perform comprehensive linear, equivalent-linear, and nonlinear site response analyses of 191 ground motions recorded at six validation sites in the Kiban-Kyoshin network (KiK-net) of vertical seismometer arrays in Japan. These sites, which span a range of geologic conditions, are selected because they meet the basic assumptions of one-dimensional (1D) wave propagation, and are therefore ideal for validating and calibrating 1D nonlinear soil models. We employ the equivalent-linear site response program SHAKE, the nonlinear site response program DEEPSOIL, and a nonlinear site response overlay model within the general finite element program Abaqus/Explicit. Using the results from this broad range of ground motions, we quantify the uncertainties of the alternative site response models, measure the strain levels at which the models break down, and provide general recommendations for performing site response analyses. Specifically, we find that at peak shear strains from 0.01% to 0.1%, linear site response models fail to accurately predict short-period ground motions; equivalent-linear and nonlinear models offer a significant improvement at strains beyond this level, with nonlinear models exhibiting a slight improvement over equivalent-linear models at strains greater than approximately 0.05%. (C) 2014 Elsevier Ltd. All rights reserved.
机译：垂直地震仪阵列代表了观测到的地面运动与预测的地面运动之间的独特相互作用，它们对于验证和比较现场响应模型特别有用。在这项研究中，我们对垂直地震仪阵列的Kiban-Kyoshin网络（KiK-net）的六个验证点中记录的191个地面运动进行了全面的线性，等效线性和非线性站点响应分析。选择这些地点，涵盖一系列地质条件，因为它们符合一维（1D）波传播的基本假设，因此对于验证和校准1D非线性土壤模型是理想的。我们在一般有限元程序Abaqus / Explicit中采用了等效线性场地响应程序SHAKE，非线性场地响应程序DEEPSOIL和非线性场地响应覆盖模型。利用来自广泛地面运动的结果，我们量化了替代场地响应模型的不确定性，测量了模型破裂时的应变水平，并提供了进行场地响应分析的一般建议。具体来说，我们发现在峰值剪切应变为0.01％至0.1％的情况下，线性站点响应模型无法准确预测短周期地面运动；但是，在这种情况下，线性站点响应模型无法准确预测短期地面运动。等效线性和非线性模型在超过此水平的应变上提供了显着的改进，在应变大于大约0.05％时，非线性模型显示出比等效线性模型稍有改善。 （C）2014 Elsevier Ltd.保留所有权利。

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