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首页> 外文期刊>Bulletin of earthquake engineering >Ground-motion prediction equations for constant-strength and constant-ductility input energy spectra
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Ground-motion prediction equations for constant-strength and constant-ductility input energy spectra

机译：恒强度恒定延展性输入能谱的研磨预测方程

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摘要

In this study, new ground motion prediction equations are proposed for both constant-ductility and constant-strength absolute and relative input energy spectra. The proposed equations are developed using mixed-effects models calibrated through empirical regressions of inelastic responses derived from nonlinear dynamic analyses on single-degree-of-freedom systems subjected to a large number of strong ground motions. Parametric analyses are carried out to show the variation on the predicted inelastic spectra produced by the level of inelastic demand in terms of constant ductility factors and strength ratios, and by the type of hysteretic model adopted to describe the nonlinear behavior of the system. It is shown that the latter has a moderate influence only on constant-strength spectra at short periods. With the increase of the inelastic demand level, the input energy decreases at long periods while increases at short periods. In general, differences between elastic and inelastic constant-strength spectra are negligible except in the very short period range. The increase in the damping ratio reduces such differences. Comparisons between the present proposals and already existing predictive equations available in the literature are finally discussed.
机译：在该研究中，提出了新的地面运动预测方程，用于恒定延展性和恒强度绝对和相对输入能谱。所提出的等式是使用通过从非线性动态分析的非线性响应的经验回归校准的混合效应模型来开发，所述非线性动力学分析对自由度系统进行了大量强大的地面运动。进行参数分析以显示在恒定延展因子和强度比率方面的无弹性需求水平产生的预测非弹性谱的变化，以及通过用于描述系统非线性行为的滞后模型的类型。结果表明，后者仅在短时间内对恒强强度光谱产生适度的影响。随着非弹性需求水平的增加，输入能量长时间减少，而在短时间内增加。通常，除了在非常短的时间范围内，弹性和非弹性恒定强度光谱之间的差异是可忽略的。阻尼比率的增加降低了这种差异。最终讨论了本提案与已经存在的现有预测方程之间的比较最终讨论。

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