【摘要】：為了給長周期地震動(dòng)的選取和評(píng)價(jià)提供依據(jù)及量化指標(biāo),利用Hilbert-Huang變換理論分析地震動(dòng)能量特性,提出評(píng)價(jià)地震動(dòng)周期特性的方法;并且對(duì)典型的常規(guī)地震動(dòng)和近、遠(yuǎn)場長周期地震動(dòng)的時(shí)域、頻譜分布、地震動(dòng)放大系數(shù)譜及周期特性進(jìn)行了分析,得到了近遠(yuǎn)場長周期地震動(dòng)的時(shí)頻域特性及其與常規(guī)地震動(dòng)的差異。在此基礎(chǔ)上,提出用β譜曲線2到10s譜值和周期的平方加權(quán)平均值βl作為長周期地震動(dòng)的界定參數(shù);根據(jù)178條近場地震動(dòng)和151條遠(yuǎn)場地震動(dòng)的βl值的統(tǒng)計(jì)分析結(jié)果提出:βl0.4的地震動(dòng)為長周期地震動(dòng),βl0.2的地震動(dòng)為短周期地震動(dòng)(即常規(guī)地震動(dòng)),0.2≤βl≤0.4的地震動(dòng)為中長周期地震動(dòng)。這將為柔性橋梁抗震分析時(shí)長周期地震動(dòng)的選取提供依據(jù)。
[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，

本文編號(hào)：2241785