基于相位差谱的时-频非平稳人造地震动的反应谱拟合

Generation of response-spectrum-compatible ground motions based on phase-difference spectrum

本文根据相位差谱对地震动时程非平稳性的影响，反应谱、功率谱和傅里叶幅值谱间的数学关系以及加速度时程单谐波分量对反应谱拟合精度和拟合效率的作用，提出了一种可直接拟合目标反应谱的具有时－频非平稳性的人工地震动的高效方法，算例说明了其有效性。

Based on the controlling influence of phase-difference spectrum on the nonstationarity of ground motions, the relationships of the response spectrum. power density spectrum and Fourier amplitude spectrum, effects of each harmonic component of ground motions on the response spectrum fitting accuracy and efficiency, an effective method for generating the response-spectrum-compatible ground motions with time-frequency nonstationarity based on phase-difference spectrum is proposed. An illustrated example is offered.