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<p>The method of combining the Hilbert-Huang Transform (HHT) with the power spectrum G<sub>AR</sub>(ω) calculated using the Autoregressive (AR) model is employed to select long-period ground motions, which avoids the issues of low-frequency resolution and side lobe leakage in traditional selection methods. Based on the Empirical Mode Decomposition (EMD) method within the HHT transform, the long-period ground motion is decomposed, and the long-period component of ground motion is accurately separated by combining the variance contribution rate and frequency distribution characteristics of the Intrinsic Mode Function (IMF). Using the separated and reconstructed ground motions as input actions, the influence of long-period components on the seismic response of the frame-core tube structure of a super-high-rise building is studied. The results demonstrate that combining the HHT transform and the AR model power spectrum can accurately select ground motion. The ground motion with parameter L<sub>PGI</sub> &lt; 0.6 is ordinary ground motion, and the index L<sub>PGI</sub> ≥ 0.6 is long-period ground motion. The (EMD) method can accurately extract the long-period ground motion components from the long-period ground motion. The long-period ground motion contains abundant low-frequency short-period energy, which is the main reason for the seismic response of super-high-rise building structures. It is recommended to focus on the influence of long-period ground motion components on the seismic design of super high-rise building structures.</p>

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Definition of long-period components of ground motion and their impact on the seismic response of super-high-rise building structures

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Qiren Jiang,
  • Guoliang Bai,
  • Lili Liang,
  • Bin Wu

摘要

The method of combining the Hilbert-Huang Transform (HHT) with the power spectrum GAR(ω) calculated using the Autoregressive (AR) model is employed to select long-period ground motions, which avoids the issues of low-frequency resolution and side lobe leakage in traditional selection methods. Based on the Empirical Mode Decomposition (EMD) method within the HHT transform, the long-period ground motion is decomposed, and the long-period component of ground motion is accurately separated by combining the variance contribution rate and frequency distribution characteristics of the Intrinsic Mode Function (IMF). Using the separated and reconstructed ground motions as input actions, the influence of long-period components on the seismic response of the frame-core tube structure of a super-high-rise building is studied. The results demonstrate that combining the HHT transform and the AR model power spectrum can accurately select ground motion. The ground motion with parameter LPGI < 0.6 is ordinary ground motion, and the index LPGI ≥ 0.6 is long-period ground motion. The (EMD) method can accurately extract the long-period ground motion components from the long-period ground motion. The long-period ground motion contains abundant low-frequency short-period energy, which is the main reason for the seismic response of super-high-rise building structures. It is recommended to focus on the influence of long-period ground motion components on the seismic design of super high-rise building structures.