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Prediction of the number of equivalent cycles for earthquake motion

机译：预测地震运动的等同周期数量

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This paper addresses new prediction models for computing the number of equivalent cycles in liquefaction analyses. Three models are presented for the Italian seismicity as a function of synthetic ground motion parameters that are often available from earthquake data web-sites immediately after events. In particular, it is observed that the number of earthquake cycles can be best estimated from the five following parameters: peak ground acceleration; epicentral distance; Arias Intensity; the mean period; and, the frequency of zero crossings. However, strong estimations can be obtained from the first three parameters only. We use statistical indicators to determine the goodness of the models and the usefulness of the selected independent variables, and we present a comparative analysis to validate our predictive equations. Moreover, this paper describes the existing correlation between magnitude and cycle numbers. The study is primarily based on Italian acceleration records, even if the database is also expanded to recorded European, Japanese and American events to amplify the magnitude values range. These simplified models are useful in addressing practical earthquake engineering problems which require the knowledge of number of equivalent cycles.
机译：本文讨论了液化分析中计算等效循环次数的新预测模型。意大利地震活动的三个模型是合成地震动参数的函数，通常在地震发生后立即从地震数据网站上获得。特别是，可以从以下五个参数中最好地估计地震周期数：峰值地面加速度；震中距；咏叹调强度；平均周期；以及过零的频率。然而，强估计只能从前三个参数中获得。我们使用统计指标来确定模型的优点和所选自变量的有用性，并通过对比分析来验证我们的预测方程。此外，本文还描述了震级和周期数之间的现有相关性。这项研究主要基于意大利的加速度记录，即使数据库也扩展到欧洲、日本和美国记录的事件，以扩大震级值范围。这些简化模型有助于解决实际地震工程问题，这些问题需要了解等效周期的数量。

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