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本文根据《建筑抗震设计规范》(GB 50011—2010),对随机地震动功率谱模型(杜修力-陈厚群模型)参数的取值进行了研究。通过最小二乘法用杜修力-陈厚群模型去拟合由现行抗震规范反应谱曲线转换得到的功率谱密度函数,从而确定规范中不同场地类别和设计分组所对应的场地土阻尼比ξg和卓越角频率ωg以及小震、中震、大震下对应的谱强度因子S0。本文确定的模型参数与我国新抗震规范建筑场地类别的划分相协调,便于实际应用。
In this paper, according to the Code for Design of Seismic Design of Buildings (GB 50011-2010), the parameters of random seismic power spectrum model (Du Xiuli-Chen Houqun model) are studied. The least squares method was used to fit the power spectral density function converted from the current seismic code response spectrum curve by using the Du Xiu-Chen-Hou-Qun model to determine the field damping ratio ξg and the excellent angular frequency ωg of the site corresponding to different site categories and design groups in the code And the corresponding spectral intensity factor S0 under small earthquakes, moderate earthquakes and large earthquakes. The model parameters identified in this paper are in harmony with the classification of new seismic code construction sites in China, which is convenient for practical application.