Abstract Undrained stress-controlled cyclic triaxial and direct simple shear test data on five different clean sands was analyzed in terms of dissipated and stored strain energy. A new method was developed to calculate damping ratio from undrained stress-controlled tests and its plausibility was examined with the help of pore water pressure data. Results from different methods in the literature to calculate damping ratio were also evaluated. The data analysis shows that the damping ratio results calculated with the new method were in some agreement with the damping ratio values for sands summarized by Seed & Idriss (1970) [1] for shear strains up to 0.4%. For shear strains larger than 0.4%, the new method provides more accurate estimates of damping ratio that are also conceptually more reasonable than those obtained with linear equivalent approximations. For strains in excess of 1%, damping ratio trends with strain obtained with the new method are clearly superior, although reliable experimental data is limited. In general, equivalent linear calculation of damping ratio can lead to an overestimation of damping for shear strains smaller than 1% and an underestimation of damping for the shear strains larger than 1%.

中文翻译：

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负载控制循环试验中砂的高应变阻尼：存储应变能与孔隙水压力之间的相关性

摘要 从耗散和储存应变能的角度分析了五种不同洁净砂的不排水应力控制循环三轴和直接简单剪切试验数据。开发了一种新方法来计算不排水应力控制试验中的阻尼比，并在孔隙水压力数据的帮助下检查其合理性。还评估了文献中计算阻尼比的不同方法的结果。数据分析表明，用新方法计算的阻尼比结果与 Seed & Idriss (1970) [1] 总结的沙子的阻尼比值在一定程度上吻合，剪应变高达 0.4%。对于大于 0.4% 的剪切应变，新方法提供了更准确的阻尼比估计，在概念上也比使用线性等效近似法获得的估计更合理。对于超过 1% 的应变，尽管可靠的实验数据有限，但使用新方法获得的应变的阻尼比趋势明显更好。通常，阻尼比的等效线性计算会导致对小于 1% 的剪应变高估阻尼，对大于 1% 的剪应变低估阻尼。