包络目标功率谱的人工地震动合成方法研究
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摘要
提出了一种同时拟合目标反应谱并包络目标功率谱的人工地震动合成方法。针对每一个反应谱控制频率:首先在时域内叠加增量窄带时程,使得人工地震动的反应谱与目标值相等;其次在不改变其反应谱的前提下,在时域内对人工地震动进行调整以实现对目标功率谱的包络。计算实例表明,该方法所合成的人工地震动不仅具有较高的对目标反应谱的拟合精度,而且其平均功率谱也包络了目标功率谱。
In this paper,a synthesizing method,which can generate the artificial ground motion that not only matches the target response spectrum but envelopes the corresponding target power spectrum,is proposed.With respect to every controlling frequency of the response spectrum:firstly,by superimposing the incremental narrow-band time history,the response spectrum of artificial ground motion is made to equal to the target value;and then,with its response spectrum unchanged,the time history is further modulated in the time domain to make its average power spectrum envelope the target one.A numerical example illustrates that not only the ground motion time history generated by this method possesses high matching precision to the target response spectrum,but also its average power spectrum envelopes the target power spectrum.
In this paper,a synthesizing method,which can generate the artificial ground motion that not only matches the target response spectrum but envelopes the corresponding target power spectrum,is proposed.With respect to every controlling frequency of the response spectrum:firstly,by superimposing the incremental narrow-band time history,the response spectrum of artificial ground motion is made to equal to the target value;and then,with its response spectrum unchanged,the time history is further modulated in the time domain to make its average power spectrum envelope the target one.A numerical example illustrates that not only the ground motion time history generated by this method possesses high matching precision to the target response spectrum,but also its average power spectrum envelopes the target power spectrum.
引文
[1]Zhao Fengxin,Zhang Yushan,Lv Hongshan.Artificial Ground Motion Compatible with Specified Ground Shaking Peaks and Target Response Spectrum.Earthq Engrg Engrg Vibr,2006,5(1):41-48.
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[4]U.S Atomic Energy Commission.Regulatory Guide 1.60: Design Response Spectra for Seismic Design of Nuclear Plants[S].1973.
[2]U.S.Nuclear Regulatory Commission.Standard Review Plan[S].1988.
[3]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[4]U.S Atomic Energy Commission.Regulatory Guide 1.60: Design Response Spectra for Seismic Design of Nuclear Plants[S].1973.
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