中文摘要：

本文采用全球范围128次地震的3235组三分量强地面运动记录，分析了其加速度竖向分量反应谱与水平分量反应谱的比值（V／H）的总体特征，研究了V／H随震级、震中距、局部场地条件和震源机制的变化关系。研究结果表明：（1）场地越硬，长周期段V／H越大，短周期段则相反；（2）震级越大，长周期段V／H越大，短周期段变化不明显；（3）短周期段V／H随震中距增大而减小；（4）对于大震（M〉7），长周期段V／H随震中距增大而减小；而对于中强震（M〈7），比值在近场（R〈60km）随震中距增加而增大，在远场则随震中距增加而减小；（5）V／H与震源机制也有一定的关系。

英文摘要：

In this paper, 3225 strong ground motion records from 128 earthquakes are used to calculate the ratios of the vertical to horizontal acceleration response spectra （V/H）. The records are divided into groups according to site condition, epicentral distance, magnitude and focal mechanism. This study focuses on the relationship between V! H and these factors. The results show that ： （ 1 ） the harder the site is, the larger the V/H in long-period range be- comes, and the V/H in short-period range is opposite. （2） The greater the magnitude is, the higher the V/H in long-period range becomes, but the V/H in short period is not impressible. （3） The V/H in short period decreases as epieentral distance increases. （4） For great magnitude （M 〉 7 ）, the V/H in long-period range reduces as the epicentral distance increases. However, for great-moderate earthquakes （M 〈 7）, the ratio increases with the epi- central distance in near-field, and it reduces as the epicentral distance increases in far-field. （5） The V/H is also related to focal mechanism.