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中文摘要：
非弹性位移比谱是估计工程结构非弹性位移一种简单而有效的方法。以大量的地震动记录为基础，研究近场脉冲型地震动位移比谱的特征，同时考察场地条件、峰值地面速度与峰值地面加速度比（PGV／PGA）、峰值地面速度（PGV）和最大增量速度（MIV）对近场地震动位移比谱的影响。结果表明近场地震动的脉冲作用在0．2—1．5S的周期段对位移比谱的影响最大，在此周期段，位移比谱增大了近20％左右；在其他周期段，近场地震动的脉冲作用对位移比谱的影响不明显。通过研究不同地震动参数对近场位移比谱的影响发现，峰值地面速度与峰值地面加速度比（PGV／PGA）是影响近场地震动位移比谱最大的参数，场地条件对近场地震动位移比谱的影响不大。
英文摘要：
The displacement ratio spectra method is a simple and effective way to evaluate the maximum inelastic displacements of structures. The characteristics of displacement ratio spectra for near-field ground motions are investigated based on a great number of earthquake ground motions. The effects of site condition, ratio of peak ground velocity to peak ground acceleration （PGV/PGA）, peak ground velocity （PGV） and maximum incremental velocity （MIV） on displacement ratio spectra are also evaluated. It is concluded that the effect of near-field ground motions on displacement ratio spectra is significant at periods between 0.2-1.5 s, where the amplifications can approach 20%. However, the effect is not obvious in other period ranges. PGV/PGA can provide the largest influence on displacement ratio spectra for near-field ground motions. It is also found that site condition has small effect on inelastic ＇displacement ratio spectra for near-field ground motions.
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A new approach of selecting real input ground motions for seismic design: the most unfavourable real
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