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A new energy-compatible nonstationary stochastic ground-motion simulation method

机译：一种新的能量兼容的非间流随机地面运动仿真方法

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摘要

A new time-frequency modulating function with a novel equivalent average-intensity envelope based on the instantaneous energy is proposed to simulate fully nonstationary ground motions. The new model utilizes simple, uncoupled, and statistically well-studied temporal and spectral nonstationary parameters. Then, a period-by-period simulation method based on the proposed stochastic model is developed to match multiple targets. A numerical comparison shows that the new method replicates well both the target temporal and spectral nonstationarities and it is efficient and easy to use in engineering practice. This study also demonstrates that for obtaining site-specific seismic input by means of site response analysis: (1) the frequency contents of bedrock motion, including the energy concentration in terms of frequency and frequency decaying with respect to time, have a significant impact on the site response with moderate and large PGA levels; (2) using the proposed instantaneous-frequency-related time modulating function to approximate the real ground motion leads to results sufficiently close to the record for nonlinear site response regardless PGA levels and site condition. Therefore, attention should be paid to the change of nonstationary characteristics of ground-motion frequency according to the source, path, and site condition when simulating ground motion on bedrock. As the proposed methods can approximately control various ground-motion characters, different targets of ground-motion simulation can be matched for different engineering purpose such as site response analysis, time-history analysis of special structures, etc.
机译：提出了一种新的基于瞬时能量的新的等效平均强度包络的新的时频调制功能，以模拟完全不稳定的地面运动。新模型利用简单，解耦和统计学上学习的时间和光谱非稳定参数。然后，开发了一种基于所提出的随机模型的逐周期仿真方法以匹配多个目标。数值比较表明，新方法重复了目标时间和光谱非稳定性，并且在工程实践中是有效且易于使用的。本研究还表明，通过现场响应分析获得特异性地震输入：（1）基岩运动的频率含量，包括频率和频率衰减的能量集中，对时间有重大影响具有中等和大的PGA水平的网站响应; （2）使用所提出的瞬时频率相关的时间调制功能来近似真实地运动导致导致的结果与非线性部位响应的记录充分接近，无论pGA水平和现场条件如何。因此，当在基岩上模拟地面运动时，应注意在地面运动频率的不间断特征的变化。由于所提出的方法近似控制各种地面运动特性，可以匹配不同的工程目的，例如站点响应分析，特殊结构的时间历史分析等的不同地面运动仿真目标。

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