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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >A stochastic ground motion model with separable temporal and spectral nonstationarities
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A stochastic ground motion model with separable temporal and spectral nonstationarities

机译：具有可分离的时间和频谱非平稳性的随机地震动模型

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摘要

A fully nonstationary stochastic model for strong earthquake ground motion is developed. The model employs filtering of a discretized white-noise process. Nonstationarity is achieved by modulating the intensity and varying the filter properties in time. The formulation has the important advantage of separating the temporal and spectral nonstationary characteristics of the process, thereby allowing flexibility and ease in modeling and parameter estimation. The model is fitted to target ground motions by matching a set of statistical characteristics, including the mean-square intensity, the cumulative mean number of zero-level up-crossings and a measure of the bandwidth, all expressed as functions of time. Post-processing by a second filter assures zero residual velocity and displacement, and improves the match to response spectral ordinates for long periods.
机译：建立了强地震地震动的完全非平稳随机模型。该模型采用离散白噪声过程的滤波。通过调节强度并及时更改滤镜属性可以实现非平稳性。该配方具有将过程的时间和频谱非平稳特性分开的重要优势，从而在建模和参数估计方面具有灵活性和易用性。该模型通过匹配一组统计特征（包括均方强度，零水平上交的累积平均数和带宽的度量）而拟合为目标地面运动，所有这些均表示为时间的函数。通过第二个滤波器进行的后处理可确保零残留速度和位移，并长期改善与响应光谱坐标的匹配。

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