长周期地震动的特性分析及界定方法研究
发布时间：2018-09-13 16:57
【摘要】：为了给长周期地震动的选取和评价提供依据及量化指标,利用Hilbert-Huang变换理论分析地震动能量特性,提出评价地震动周期特性的方法;并且对典型的常规地震动和近、远场长周期地震动的时域、频谱分布、地震动放大系数谱及周期特性进行了分析,得到了近远场长周期地震动的时频域特性及其与常规地震动的差异。在此基础上,提出用β谱曲线2到10s谱值和周期的平方加权平均值βl作为长周期地震动的界定参数;根据178条近场地震动和151条远场地震动的βl值的统计分析结果提出:βl0.4的地震动为长周期地震动,βl0.2的地震动为短周期地震动(即常规地震动),0.2≤βl≤0.4的地震动为中长周期地震动。这将为柔性桥梁抗震分析时长周期地震动的选取提供依据。
[Abstract]:In order to provide the basis and quantitative index for the selection and evaluation of long-period ground motion, the energy characteristics of ground motion are analyzed by using Hilbert-Huang transform theory, and a method to evaluate the periodic characteristics of ground motion is put forward, and for typical conventional ground motion and near ground motion, The time-domain, spectral distribution, magnification factor spectrum and periodic characteristics of long-period far-field ground motions are analyzed, and the time-frequency characteristics of long-period near-far-field ground motions and their differences with conventional ground motions are obtained. On the basis of this, it is proposed that the 尾 -spectrum curve from 2 to 10 s and the squared weighted mean 尾 _ l of the period be used as the defining parameters of the long-period ground motion. Based on the statistical analysis of the 尾 _ l values of 178 near-field ground motions and 151 far-field ground motions, it is proposed that the ground motions of 尾 _ l _ 0.4 are long-period ground motions, and that of 尾 _ l _ 0.2 are short periodic ground motions (i.e. conventional ground motions) and that of 尾 _ l _ (0.4) 鈮，
本文编号：2241785
[Abstract]:In order to provide the basis and quantitative index for the selection and evaluation of long-period ground motion, the energy characteristics of ground motion are analyzed by using Hilbert-Huang transform theory, and a method to evaluate the periodic characteristics of ground motion is put forward, and for typical conventional ground motion and near ground motion, The time-domain, spectral distribution, magnification factor spectrum and periodic characteristics of long-period far-field ground motions are analyzed, and the time-frequency characteristics of long-period near-far-field ground motions and their differences with conventional ground motions are obtained. On the basis of this, it is proposed that the 尾 -spectrum curve from 2 to 10 s and the squared weighted mean 尾 _ l of the period be used as the defining parameters of the long-period ground motion. Based on the statistical analysis of the 尾 _ l values of 178 near-field ground motions and 151 far-field ground motions, it is proposed that the ground motions of 尾 _ l _ 0.4 are long-period ground motions, and that of 尾 _ l _ 0.2 are short periodic ground motions (i.e. conventional ground motions) and that of 尾 _ l _ (0.4) 鈮，
本文编号：2241785
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