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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Strain accumulation due to packages of cycles with varying amplitude and/or average stress - On the bundling of cycles and the loss of the cyclic preloading memory
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Strain accumulation due to packages of cycles with varying amplitude and/or average stress - On the bundling of cycles and the loss of the cyclic preloading memory

机译：由于振幅和/或平均应力变化的循环软件包而引起的应变累积-关于循环的捆绑和循环预紧记忆的损失

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摘要

In order to predict permanent deformations by means of a high-cycle accumulation (HCA) model, a random cyclic loading, i.e. a loading with frequently changing amplitudes, has to be grouped into packages of cycles each with a constant amplitude. Based on a series of drained triaxial tests on fine sand, in which the same cycles have been applied either in an order with frequently changing amplitudes or in packages of cycles, it is demonstrated that such bundling is conservative. Predictions by the HCA model of Niemunis et al. [19] are confronted with experimental data and with other approaches for the prediction of permanent deformations under packages of cycles, among them the frequently cited procedure of Stewart [26]. An effect not captured in the HCA model or in any other approach yet has been detected in another series of tests with a change of the average stress between bundles of cycles: The monotonic loading associated with this change can partially or fully erase the memory of the sand regarding its cyclic preloading history.
机译：为了通过高循环累积（HCA）模型预测永久变形，必须将随机循环载荷（即振幅经常变化的载荷）分组为每个周期都具有恒定振幅的包。基于在细砂上进行的一系列排水三轴试验，其中以振幅变化频繁的顺序或以循环包装的形式应用了相同的循环，证明了这种捆绑是保守的。 Niemunis等人的HCA模型预测。 [19]面对实验数据和其他预测周期循环下的永久变形的方法，其中经常提到的Stewart [26]程序。在HCA模型或任何其他方法中未捕获到的效果在另一系列测试中已检测到，循环束之间的平均应力发生了变化：与该变化相关的单调负载可以部分或完全擦除内存的记忆。关于其循环预压历史

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