摘要
设计反应谱是抗震设计的重要依据,控制设计谱取值的特征参数受到统计的地震动数据的影响,而地震动具有区域性差异,因此设计谱特征参数确定时应考虑区域地震动的特征。基于我国西南地区276次地震的3084条地震动记录,应用高稳定性的GLDE算法和设计谱四阶段模型,对西南地区的设计谱参数进行标定,并对结果进行了比较和验证。将标定结果与我国规范谱的特征参数进行对比,分析了基于地震分组的西南地区设计谱特征参数:放大系数最大值(β_(max))、第一拐点(T_(0))、特征周期(T_(g))、第三拐点(T_(d))和下降段衰减指数(γ)的计算结果。结果表明:对于西南地区,第一拐点略大于现行规范谱的值,特征周期与现行值均有不同,第三拐点、放大系数的最大值和长周期段衰减指数均大于现行值。研究结果可为区域性设计谱的建立提供参考。
Design response spectrum is an important basis for seismic design.The characteristic parameters which control the value of design spectrum are firstly affected by statistical ground motion data,while ground motion has significant regional differences.Therefore,the characteristics of regional ground motion should be considered when determining the characteristic parameters of design spectrum.Based on 3084 ground motion records of 276 earthquakes in southwest China,the high-stability GLDE algorithm and four-stage fitting model of design spectrum were used to calibrate design spectrum parameters in southwest China and analyze the results.By comparing the calibration results with the characteristic parameters of China’s standard spectra,the calculation results of characteristic parameters of design spectrum in southwest China were given based on Chinese seismic grouping:the maximum magnification factor(β_(max)),the first inflection point(T_(0)),the characteristic period(T_(g)),the third inflection point(T_(d))and the downward decay index(γ).In southwest China,the results show that the first inflection point is slightly higher than the current one,the characteristic period is different from the current value and all of the third inflection point,the maximum magnification coefficient and the long period decay index are larger than the current ones.In addition,the results of this paper can also provide reference for revision and establishment of design spectrum in southwest China.
作者
胡进军
石昊
谭景阳
HU Jinjun;SHI Hao;TAN Jingyang(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第6期1-13,共13页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(U1939210,520784704)
中国地震局地震工程与工程振动重点实验室重点专项(2021EEEVL0103)。
关键词
西南地区
地震动
设计谱
特征参数
抗震设计
southwestern areas of China
ground motion
design response spectra
characteristic parameter
seismic design
