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通过引入主震与余震间的震级、震源参数以及峰值速度的物理关系,将已有的单震物理随机模型推广到序列型地震动,并利用实测主余震记录拟合获得了模型中各参数的概率分布,进一步结合窄带谐波叠加法实现了序列型地震动的工程模拟。从典型样本时程和反应谱两个层面上与实测地震动记录进行了对比,结果表明模拟地震动具有与实测记录相同的频谱特性,能够反映实际地震动的时域、频域非平稳性,建议模型所给出的反应谱均值和标准差与实测记录的统计结果基本一致,可用于序列型地震作用下工程结构的抗震性能分析。
By introducing the physical relationship between the magnitudes of major and aftershocks, the source parameters and the peak velocity, the existing single-stochastic physical stochastic models are generalized to sequence-type ground motions and the measured parameters of the main aftershock records are obtained Probability distribution, combined with the narrow-band harmonic superposition method to achieve a series of engineering simulation of ground motion. Compared with the measured ground motion records from the typical sample time history and response spectrum, the results show that the simulated ground motion has the same spectral characteristics as the measured records, and can reflect the time-domain, frequency-domain nonstationarity of the actual ground motion, The mean and standard deviation of the response spectra given by the proposed model are basically the same as those of the measured records and can be used to analyze the seismic performance of engineering structures under the effect of sequence-type earthquakes.