基于不同地震事件数据的竖向地震动特性统计分析  

Statistical investigation on characteristics of vertical ground motion based on different earthquake event data

作　　者：韩建平[1,2] 魏宏亮[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《土木工程学报》2013年第S1期127-133,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(51268036);甘肃省高校基本科研业务费项目(0904ZTB152);甘肃省建设科技攻关项目(JK2009-22)

摘　　要：选取9次不同地震事件的86组地震动加速度记录,对其地震动参数进行分析,重点选择地震动竖向与水平峰值加速度比、竖向与水平加速度反应谱及竖向与水平卓越周期比等进行统计研究。研究结果表明:竖向与水平峰值加速度比的平均值为0.78,且大约60%台站的峰值加速度比大于2/3;随着震中距的增大,竖向与水平峰值加速度比总体上呈减小趋势;竖向与水平加速度反应谱比曲线在周期0～6s内大致呈"Z"字形;竖向加速度反应谱和水平加速度反应谱的谱形有较大差异,且竖向反应谱达到最大值的周期值明显小于水平反应谱达到最大值的周期值;绝大多数台站竖向与水平卓越周期比小于1.0,且该比值随着震中距的增大呈增大趋势。在此基础上,建议抗震设计规范对竖向地震影响系数的取值及衰减指数、特征周期等做单独规定。86 suites of acceleration records from the 9 earthquake events around the world were selected and processed for extracting some essential ground motion parameters. The ratios of vertical to horizontal peak ground acceleration,vertical and horizontal acceleration response spectra and predominant period were mainly investigated statistically. The results indicated that the average ratio of vertical to horizontal peak ground motion is 0. 78,and the ratios of more than60% stations are greater than the rule of thumb,2 /3. This ratio decreases with the increasing epicentral distance. The curves of vertical to horizontal acceleration response spectrum ratios with period from 0 to 6 second have 'Z'shape generally. The shapes of vertical and horizontal acceleration response spectrum vary within the different period range.And the vertical acceleration response spectrum achieves the maximum value at the smaller period comparing to the horizontal acceleration response spectrum. For most of stations,the ratio of vertical to horizontal predominant period is less than 1. 0. And this ratio increases with the increasing epicentral distance. Finally, influence coefficients,attenuation index and characteristic period of vertical seismic effect for the seismic design code should be prescribed separately.

关 键 词：竖向地震动 峰值加速度比 反应谱 卓越周期 

分 类 号：P315.9[天文地球—地震学]