本文提出的方法较易掌握，可以作为工程场地和中小城市地震影响小区划中确定设计反应谱的简化方法。
The method is easy to master, and then, can be used for the definition of design spectra in the seismic microzonation small or moderate cities, and in the site evaluation of engineering projects.
如何考虑场地土层结构对设计反应谱的影响，并合理的规定设计反应谱是当前场地研究中的重要课题之一。
How to consider the effects of soil layer construction and adjust the response spectra according as soil layer construction is an important subject in current site study.
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.
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