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    楊松濤  葉列平  錢(qián)稼茹
    （清華大學(xué)土木工程系  北京 100084）

[提要]  研究了地震地面運(yùn)動(dòng)的加速度譜、位移反應(yīng)譜與富里葉譜之間的對(duì)應(yīng)關(guān)系，結(jié)果表明，加速度譜可較好地表現(xiàn)地震動(dòng)高頻部分的特性，位移譜可較好地表現(xiàn)地震動(dòng)低頻部分的特性。提出了位移譜特征周期Tgd的概念，并以彈性位移譜上Tgd對(duì)應(yīng)的點(diǎn)為基準(zhǔn)點(diǎn)對(duì)位移譜進(jìn)行標(biāo)準(zhǔn)化，較好地消減了不同地震動(dòng)對(duì)位移譜曲線(xiàn)形狀的影響。最后，根據(jù)多條地震動(dòng)的計(jì)算結(jié)果，總結(jié)了此標(biāo)準(zhǔn)化方法下的平均位移譜的特征，為基于位移抗震設(shè)計(jì)理論的研究提供了基礎(chǔ)。
[關(guān)鍵詞]  地震反應(yīng)  位移譜  特征周期  標(biāo)準(zhǔn)化  單自由度體系

The correlation among the peaks of acceleration spectra, displacement spectra and input ground acceleration Fourier amplitude spectra was investigated for single-degree-of-freedom( SDF)system. The results showed that at short periods acceleration spectrum could reflect the spectral characteristics of ground oscillation well, while at long periods displacement spectrum could do that well. The problem of standardizing for displacement spectrum was studied.A concept of characteristic periods of displacement spectra was proposed, which resulted in reducing the effects of different ground motions on the displacement spectrum shape. Finally, based on standardized displacement spectra calculated under different ground motions, the characteristics of elastic and inelastic displacement spectra were concluded.
Keywords: earthquake response; displacement spectrum; characteristic period; single degree freedom system