對應新抗震規(guī)范反應譜的功率譜模型參數(shù)研究
周佩佩1，巢斯1,2
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（1 同濟大學建筑工程系，上海 200092； 2 同濟大學建筑設計研究院（集團）有限公司，上海 200092）[摘要] 本文根據(jù)《建筑抗震設計規(guī)范》（GB 50011—2010），對隨機地震動功率譜模型（杜修力-陳厚群模型）參數(shù)的取值進行了研究。通過最小二乘法用杜修力-陳厚群模型去擬合由現(xiàn)行抗震規(guī)范反應譜曲線轉(zhuǎn)換得到的功率譜密度函數(shù)，從而確定規(guī)范中不同場地類別和設計分組所對應的場地土阻尼比 和卓越角頻率 以及小震、中震、大震下對應的譜強度因子 。本文確定的模型參數(shù)與我國新抗震規(guī)范建筑場地類別的劃分相協(xié)調(diào), 便于實際應用。[關鍵詞] 建筑抗震設計規(guī)范; 杜修力-陳厚群功率譜; 功率譜密度函數(shù)中圖分類號：P315.9 文獻標識碼：A 文章編號：1002-848X(2013)S2-0430-06作者簡介：周佩佩，工學碩士，助理工程師，Email:maqiyaduo11@126.com。Parameters research on seismic power spectrum model based on the new seismic design code for buildingsZhou Peipei1, Chao Si1,2(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Tongji Architectural Design (Group) Co. , Ltd. , Shanghai 200092, China)Abstract: Parameters research on Du-Chen power spectrum model based on the new seismic design code is carried out.Via nonlinear least squares method with Du-Chen model, the site soil damping ratio as well as superior angular frequency can be fitted out to satisfy power spectrum density function converted by the response spectrum curve in the new seismic design code. This method also can be applied to identify spectrum density parameter under frequent earthquake, medium earthquake and rare earthquake. The model parameters determined in the paper work in coordination with the site categorization in the new seismic design code, and it is easy to be used in practice.Keywords: the new seismic design code for buildings; Du-Chen power spectrum; power spectrum density function
