川滇甘陕地区设计反应谱特征周期的统计分析  

Statistical analysis of characteristic periods of design response spectra in Sichuan,Yunnan,Gansu and Shanxi

作　　者：赵培培[1,2] 王振宇[1,2] 薄景山[1,2] 张建毅[2] 

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]防灾科技学院,河北三河065201

出　　处：《世界地震工程》2017年第2期97-104,共8页World Earthquake Engineering

基　　金：国家科技支撑计划项目(2015BAK17B01);国家科技重大专项(2013ZX06002001);国家自然科学基金项目(51208108)

摘　　要：以四川、云南、甘肃和陕西地区263个有详细场地资料的强震台站获得的2 388条强震记录为基础资料,对每一条水平向强震记录采用差分进化算法确定了加速度反应谱的特征周期。在考虑震级、震中距和场地类别基础上,统计不同震级、震中距和场地类别的特征周期值,并研究其对特征周期的影响。统计结果表明:这一地区,水平向加速度反应谱特征周期的均值随震级的增大而增大;随着场地类别的增加而增大;Ⅱ类场地的特征周期随着震中距的增大而增大;远场比近场的反应谱特征周期偏大;这一地区大震远场反应谱特征周期的统计结果较我国抗震设计规范规定的大震远场反应谱特征周期值偏高,研究结果对进一步合理确定加速度反应谱的特征周期有重要参考价值。Based on 2 388 strong ground motions, collected at 263 sites in Sichuan, Yunnan, Gansuand Shanxi, the characteristic periods of horizontal acceleration response spectra are calculated by differential evolution and catego- rized into parameters as different earthquake magnitude, epicentral distance and soil sites. To investigate the effect of different parameter on characteristic periods, statistical analysis is performed. The results show that horizontal ac- celeration response spectra increases with earthquake magnitude, epicentral distance and site sites. And, the charac- teristic periods of far - field ground motions are larger than that of near - field ones. It is interesting to note that the characteristic periods of larger earthquake magnitude in the far field are greater than those of Chinese seismic design code. The data and the results are instructional for reasonable determination of characteristic periods of acceleration response spectra

关 键 词：反应谱 特征周期 场地类别 震级 震中距 

分 类 号：P315.9[天文地球—地震学]