考虑黄土场地特性的地震动模型参数研究  

Parameter study of seismic ground motion model considering the characteristics of loess site

作　　者：刘益坤 欧尔峰[1] Liu Yi-kun;Ou Er-feng(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《工程抗震与加固改造》2024年第6期176-182,175,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(52168058)。

摘　　要：地震的发生是具有随机性的,借助地震动功率谱模型进行分析可充分考虑地震动的随机性,但在目前的研究中,考虑特殊场地的地震动模型参数取值的研究较少。为研究考虑黄土场地特性的功率谱参数取值问题,本文针对黄土地区的典型场地给出考虑黄土场地特征的设计反应谱及地面加速度最大值的调整值。以太平洋地震工程研究中心的NGA-West2地震波库为基础,选择能够反应黄土场地地震波动力特性的地震记录。使用最小二乘法确定了不同分组的杜修力-陈厚群模型谱强度因子、场地阻尼比和卓越角频率。结果表明,在全频段的参数拟合结果都较好。The occurrence of earthquakes is stochastic in nature.Analyzing earthquake ground motion using the power spectral model can adequately consider the randomness of seismic motion.However,in current research,there is limited study on determining the values of seismic motion model parameters for specific site conditions.To investigate the values of power spectral parameters considering loess site characteristics,adjusted design response spectra and peak ground acceleration values for typical loess sites are presented in this paper.Based on the earthquake wave database named NGA-West2 from the Pacific Earthquake Engineering Research Center,seismic records representing loess site conditions were selected.The least squares method was employed to determine the spectral intensity factors,site damping ratios,and corner frequencies for different groupings.The results demonstrate good parameter fitting across the entire frequency range.

关 键 词：地震动模型 黄土场地 平均功率谱 最小二乘法 参数拟合 

分 类 号：P315.9[天文地球—地震学]