竖向与水平向地震动加速度反应谱比特性分析  

Study on characteristics of vertical to horizontal acceleration response spectral ratio

作　　者：李恒[1,2] 秦小军[1] 

机构地区：[1]中国地震局地震研究所,湖北武汉430071 [2]武汉地震工程研究院,湖北武汉430071

出　　处：《地震工程与工程振动》2010年第1期8-14,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(40674019);中国地震局地震研究所基金项目(IS200926044)

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。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.

关 键 词：加速度反应谱 竖向地震动 场地条件 震源机制 

分 类 号：P315.915[天文地球—地震学]