A PROCEDURE FOR ESTIMATING INPUT ENERGY SPECTRA FOR SEISMIC DESIGN
A PROCEDURE FOR ESTIMATING INPUT ENERGY SPECTRA FOR SEISMIC DESIGN
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DOI：
10.1080/13632460009350382
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发表时间：
2000-10
影响因子：
2.6
通讯作者：
Y. Chai;P. Fajfar
中科院分区：
文献类型：
--
作者：
Y. Chai;P. Fajfar
本文用地震动加速度的总功率来评价地震动毁伤潜力。通过假定输入能量谱具有适当的谱形状，并利用著名的计算随机信号总功率的Parseval定理，可以确定等效输入能量速度谱的峰值放大因子。结果表明，输入能量谱的峰值放大系数取决于地震动的峰值地加速度与峰值地速度之比和强震阶段的持续时间。对于本研究中使用的大多数记录的地面运动，等效输入能量速度放大系数的值在大约2到10之间变化。虽然在本研究中观察到的数据相当分散，但与非弹性动力时程分析确定的峰值输入能量的平均值相比，由地面加速度的傅立叶幅值谱预测的峰值放大系数提供了相当好的估计，特别是对于高阻尼和低侧向强度的系统。本文推导的峰值放大系数为地震需求的估计提供了一种更一致的方法，尽管新公式的使用对所需的抗侧强度只有微小的差异，但与先前用于编制持续时间相关的非弹性抗震设计谱的经验公式相比，该公式提供了更一致的方法。
In this paper, the damage potential of an earthquake ground motion is evaluated in terms of the total power of the acceleration of the ground motion. By assuming an appropriate spectral shape for the input energy spectrum, and using the well-known Parseval theorem for evaluating the total power of a random signal, the peak amplification factor for the equivalent input energy velocity spectrum can be determined. It is shown that the peak amplification factor for the input energy spectrum depends on the peak-ground-acceleration to peak-ground-velocity ratio and duration of the strong motion phase of the ground motion. Values for the equivalent input energy velocity amplification factor vary from about 2 to 10 for most of the recorded ground motions used in this study. Although a considerable scatter of data is observed in this study, the peak amplification factor predicted by the Fourier amplitude spectrum of the ground acceleration provides a fairly good estimate of the mean value of the peak input energy compared to that determined from inelastic dynamic time history analyses, particularly for systems with high damping and low lateral strength. The peak amplification factor derived in this paper provides a more consistent approach for estimation of seismic demand when compared to an earlier empirical expression used for the formulation of duration-dependent inelastic seismic design spectra, even though only a slight difference in the required lateral strength results from the use of the new formula.