摘要
基于黄土高原强震动记录数据库,选取144个强震台站记录的1209条强震动数据,采用单纯形算法进行反应谱标定,探究黄土高原地区场地设计反应谱特征周期与震中距、震级的变化关系。结果表明:(1)Ⅱ类场地类别下,设计反应谱特征周期与震中距的关系较为复杂,水平向特征周期整体具有随震中距增大而逐渐增加的趋势,竖向特征周期则几乎不随震中距的变化而变化(震级不大于6.5时);(2)Ⅱ类场地类别下,水平向设计反应谱的特征周期与震级(4.0<M<7.0)整体呈正相关的变化关系,震中距为[90,150)km时,特征周期与震级的关系可用T_(g)=0.054 M-0.017(EW向)、T_(g)=0.066 M-0.085(NS向)来表征;(3)与建筑抗震设计规程(DB 62/T 3055—2020)表3.2.3中的场地基本地震动加速度反应谱特征周期值相比,文章给出的黄土高原地区Ⅱ类场地设计反应谱特征周期较设计地震分组第一组、第二组的规定值小,但当震级大于6.0时,则较设计地震分组第三组的规定值大。研究结论可为黄土高原地区工程场地设计反应谱特征周期的确定提供参考。
Using the strong motion record database of the Loess Plateau,1209 items of strong motion records were selected from 144 strong motion stations,and a simplex algorithm was employed for calibration of the response spectrum to investigate the relationship between the characteristic period of the site design response spectrum and the epicenter distance and magnitude in the Loess Plateau region.The results revealed the following:(1)on the class Ⅱ site,there is a relationship established between the characteristic period of the design response spectrum and the epicenter distance;furthermore,the horizontal characteristic period gradually increases with increasing epicenter distance,while the vertical characteristic period remains nearly constant with the changing epicenter distance(M≤6.5).(2)At the class II site,the characteristic period of the horizontal design response spectrum is positively correlated with the earthquake magnitude(4.0<M<7.0);moreover,when the epicenter distance varies between 90 km and 150 km,the relationship between the characteristic period and the magnitude can be expressed by T_(g)=0.054 M-0.017(EW),and T_(g)=0.066 M-0.085(NS).(3)Compared with the characteristic period values of the ground motion acceleration response spectra for sites in Table 3.2.3 of the Specification for Seismic Design of Buildings(DB 62/T 3055—2020),the characteristic periods of the design response spectra for class Ⅱ sites in the Loess Plateau region given in this study are lower than the specified values of the first and second groups of design earthquakes;however,they are higher than the specified values of the third group when the magnitude is greater than 6.0.This work can offer guidance for determining the characteristic period of the design response spectra of engineering sites in the Loess Plateau region.
作者
李孝波
欧阳刚垒
宋霖君
吴义文
徐建元
LI Xiaobo;OUYANG Ganglei;SONG Linjun;WU Yiwen;XU Jianyuan(Institute of Disaster Prevention,Sanhe 065201,Hebei,China;Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment,Sanhe 065201,Hebei,China)
出处
《地震工程学报》
CSCD
北大核心
2023年第5期1161-1170,共10页
China Earthquake Engineering Journal
基金
国家自然科学基金(U1939209,51808118)
中央高校基本科研业务费专项(ZY20215115)。
关键词
黄土场地
强震动记录
设计反应谱
特征周期
单纯形算法
loess site
strong motion records
design response spectrum
characteristic period
simplex algorithm
