地面運動雙向最大加速度反應(yīng)譜特性研究
發(fā)布時間:2019-02-14 21:05
【摘要】:在整理當前國內(nèi)外雙向水平地面運動反應(yīng)譜值代表值后,本文認為考慮了記錄儀器所有可能水平放置方向的加速度時程對應(yīng)的所有單向加速度反應(yīng)譜值中的最大值是雙向水平地面運動反應(yīng)譜值的最佳代表值,稱其為雙向最大加速度反應(yīng)譜值(簡稱BdM譜值)。建立Ⅱ類場地地面運動數(shù)據(jù)庫,考察Ⅱ類場地不同地面運動類型BdM譜和單向加速度反應(yīng)譜Und譜的特性差異,結(jié)果表明:Ⅱ類場地同一地面運動類型下,二者在譜形上相似,但前者的動力放大系數(shù)普遍大于后者,且二者差距隨著周期的增大而增大;同一周期譜值的平均值和標準差,前者分別為后者的1.2~1.4倍和1.1~1.4倍。另外,與BdM譜相比,我國規(guī)范Ⅱ類場地設(shè)計反應(yīng)譜譜值在第一衰減段普遍偏小,在第二衰減段則低于很多地面運動類型的BdM譜值。因此,以我國設(shè)計反應(yīng)譜作為設(shè)計地震力取值依據(jù)所設(shè)計出的Ⅱ類場地工程結(jié)構(gòu),其設(shè)計地震力取值水準高低不一,從而導(dǎo)致抗震安全性高低不一;以我國設(shè)計反應(yīng)譜為目標譜選擇地面運動記錄預(yù)測出的Ⅱ類場地工程結(jié)構(gòu)的地震反應(yīng),危險性水準不一,在統(tǒng)一的性能評價標準控制下,導(dǎo)致其實際抗震性能存在差異。
[Abstract]:After sorting out the representative values of the spectral values of the bidirectional horizontal ground motion at home and abroad, In this paper, it is considered that the maximum of all unidirectional acceleration response spectra corresponding to the acceleration time history of all possible horizontal placement directions of the recording instrument is the best representative value of the bidirectional horizontal ground motion response spectrum. It is called bidirectional maximum acceleration response spectrum (BdM spectrum). The ground motion database of type 鈪,
本文編號:2422610
[Abstract]:After sorting out the representative values of the spectral values of the bidirectional horizontal ground motion at home and abroad, In this paper, it is considered that the maximum of all unidirectional acceleration response spectra corresponding to the acceleration time history of all possible horizontal placement directions of the recording instrument is the best representative value of the bidirectional horizontal ground motion response spectrum. It is called bidirectional maximum acceleration response spectrum (BdM spectrum). The ground motion database of type 鈪,
本文編號:2422610
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