关于地震波转动分量的确定方法的研究
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（1 同济大学建筑工程系，上海 200092； 2 同济大学建筑设计研究院（集团）有限公司，上海 200092）[摘要] 首先介绍利用弹性波动理论中的频域法由地震波平动加速度获得扭转、摇摆加速度的原理，其中视波速曲线采用等效相速度的理论进行求解，该方法获得的视波速能够考虑不同地区场地条件的影响，因而通过频域法生成的转动分量加速度时程曲线更符合不同地区的实际情况。之后，通过MATLAB程序进行数值模拟，利用该程序获得了El Centro波、宁河波的转动分量加速度时程曲线和功率谱曲线，并对扭转分量和摇摆分量的功率谱曲线在频率范围上的差异进行分析和说明。[关键词] 地震波扭转加速度; 摇摆加速度; MATLAB程序; 功率谱曲线中图分类号：P315.9 文献标识码：A 文章编号：1002-848X(2013)S2-0436-05作者简介：周佩佩，工学硕士，助理工程师，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
