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Wavelet analyses for seismic ground motion, simulation, and stochastic site response.

机译：小波分析，用于地震地震动，模拟和随机场地响应。

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摘要

The response of soil masses during an earthquake is governed by the characteristics of the ground motions and the soil material properties. The ground motions generated during earthquakes are random and nonstationary with respect to both amplitude and frequency.; Different methods of analysis for time-frequency characteristics of the ground motions have been reviewed and the merits and disadvantages of each are explained. The methods considered here are: Fourier Transform (FT), Short Term Fourier Transform (STFT), Wigner-Ville (WV) Distribution, Hilbert-Huang Transform (HHT), and Wavelet Transform (WT). WT method with a modified version of Littlewood-Paley mother wavelet is found most suitable to analyze the nonstationary characteristics of the seismic ground motion. This method is used to identify some of the nonlinear and nonstationary characteristics of the ground motions recorded during some important earthquakes, namely Northridge-California 1994, Kocaeli-Turkey 1999, and Chi-Chi-Taiwan, 1999. The effect of site distance and site softening on the ground motion characteristics are studied. The information on redistribution of the energy among various frequency ranges as well as its temporal variation is revealed. Responses of Clay and Sand sites with different stiffness-thickness-saturation combinations to different excitations are studied with the use of a computer code for nonlinear analysis of site response (Cyclic1D) and wavelet analysis. Observations for amplification, deamplification, and pore pressure build up are given in both time and frequency domains. A wavelet based formulation to generate earthquake ground motions is also developed. This method uses a seed acceleration history and a selected design response spectrum to produce many motions that retain the main time-frequency characteristics of the original motion, yet are all different from each other. Finally, a wavelet based method to evaluate non-stationary stochastic response of a soil site, idealized as a uniform layer of linear visco-elastic material, is also developed.
机译：地震期间土壤质量的响应受地震动和土壤材料特性的支配。地震期间产生的地面运动在振幅和频率方面都是随机的和不稳定的。综述了地面运动时频特性的不同分析方法，并说明了每种方法的优缺点。这里考虑的方法是：傅立叶变换（FT），短期傅立叶变换（STFT），维格纳-维尔（WV）分布，希尔伯特-黄变换（HHT）和小波变换（WT）。发现WT方法和Littlewood-Paley母波的改进版本最适合分析地震地震动的非平稳特征。该方法用于识别在一些重要地震（北岭-加利福尼亚1994年，科卡利土耳其-1999年和台湾Chi-Chi-台湾）中记录的地震动的一些非线性和非平稳特征。场地距离和场地的影响研究了地震动软化特征。揭示了有关能量在各个频率范围之间的重新分布及其时间变化的信息。使用计算机代码对场地响应进行非线性分析（Cyclic1D）和小波分析，研究了具有不同刚度-厚度-饱和度组合的黏土和砂土场地对不同激励的响应。在时域和频域均给出了扩增，去扩增和孔隙压力增大的观察结果。还开发了基于小波的公式来生成地震地震动。此方法使用种子加速度历史记录和选定的设计响应谱来产生许多保留原始运动主要时频特性的运动，但彼此之间都不同。最后，还开发了一种基于小波的方法来评估土壤位点的非平稳随机响应，该方法理想化为线性粘弹性材料的均匀层。

著录项

  • 作者

    Sarica, Rabia Zeynep.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 303 p.
  • 总页数 303
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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