本文以国内外18次地震的强震动记录为数据基础，对竖向地震动特征及竖向设计反应谱进行了统计分析。
In this paper, based on the records from 18 earthquakes, the characteristics of vertical ground motions and vertical response spectra are analyzed. The studies of this paper are as following.
世纪末的几次大地震中记录到了较强的竖向地震动，这引起了国内外许多学者对竖向地震动研究的关注。
Intense vertical ground motion were recorded in several earthquakes at the end of 20th century which called many researchers' attention to the properties of vertical ground motions in the world.
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