關(guān)于地震波轉(zhuǎn)動分量的確定方法的研究
周佩佩1，巢斯1,2
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（1 同濟(jì)大學(xué)建筑工程系，上海 200092； 2 同濟(jì)大學(xué)建筑設(shè)計研究院（集團(tuán)）有限公司，上海 200092）[摘要] 首先介紹利用彈性波動理論中的頻域法由地震波平動加速度獲得扭轉(zhuǎn)、搖擺加速度的原理，其中視波速曲線采用等效相速度的理論進(jìn)行求解，該方法獲得的視波速能夠考慮不同地區(qū)場地條件的影響，因而通過頻域法生成的轉(zhuǎn)動分量加速度時程曲線更符合不同地區(qū)的實際情況。之后，通過MATLAB程序進(jìn)行數(shù)值模擬，利用該程序獲得了El Centro波、寧河波的轉(zhuǎn)動分量加速度時程曲線和功率譜曲線，并對扭轉(zhuǎn)分量和搖擺分量的功率譜曲線在頻率范圍上的差異進(jìn)行分析和說明。[關(guān)鍵詞] 地震波扭轉(zhuǎn)加速度; 搖擺加速度; MATLAB程序; 功率譜曲線中圖分類號：P315.9 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)S2-0436-05作者簡介：周佩佩，工學(xué)碩士，助理工程師，Email:maqiyaduo11@126.com。Research on determination method of rotational components of seismic wavesZhou 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: This paper firstly introduces the principle of torsional and rocking ground motions obtained by translational ground motions via frequency domain method in elastic wave theory. A point worth emphasizing is that apparent wave velocity takes the influence of different sites into consideration by using the equivalent group velocity theory, so the rotational acceleration generated by the frequency domain method accords with the actual situation in different regions. Then, numerical simulation is carried out by MATLAB program, results from the program of rotational acceleration and power spectrum of El Centro wave, Ninghe wave are listed, also with the difference of power spectrum between torsional and rocking components in frequency range.Keywords: torsional acceleration; rocking acceleration; MATLAB program; power spectrum curve
