Based on the engineering geological data of a nuclear power plant site, nine engineering geological profiles were created with hard interlayers of different thicknesses. The equivalent linearization method of seismic motion segment-input used for one-dimensional nonlinear seismic response analysis was applied to study the effect of the interlayer thickness on the peak acceleration and the acceleration response spectra of the site seismic response. The results showed that there was an obvious influence of hard interlayer thickness on site seismic responses. With the increase of hard interlayer thickness, the site nonlinear effect on seismic responses decreased. Under the same thickness of the hard interlayer, the nonlinear effect of the site was strengthened with the higher input peak acceleration. In addition, the short-period acceleration response spectrum was found to be significantly influenced by the hard interlayer and showed that the longer the period, the less influence of the hard interlayer on the acceleration response spectrum coordinates. Moreover, the influenced frequency band was wider with the increase in the thickness of hard interlayer.

中文翻译：

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硬质夹层现场的地震反应特征

根据核电厂厂址的工程地质数据，创建了九个工程地质剖面，这些剖面具有不同厚度的硬质夹层。利用一维非线性地震反应分析的等效地震运动段输入线性化方法，研究了层间厚度对峰值加速度和现场地震反应加速度谱的影响。结果表明，硬夹层厚度对现场地震响应有明显影响。随着硬质夹层厚度的增加，场地非线性对地震响应的影响减小。在相同厚度的硬质中间层下，随着较高的输入峰值加速度，该部位的非线性效应得到增强。此外，结果表明，短周期的加速度响应谱受硬质中间层的影响较大，表明周期越长，硬质中间层对加速度响应谱坐标的影响越小。而且，随着硬质夹层厚度的增加，影响的频带变宽。