【摘要】 提出了一种以绝对加速度反应谱和峰值位移为目标合成人造地震动时程的方法。该方法首先利用传统的频域内调整傅立叶幅值谱的方法生成以给定峰值加速度APG、反应谱ST(ω,ζ)和强度包线为目标的初始加速度时程a(t);然后利用在时域内叠加窄带时程的方法来进一步调整a(t)以使其峰值位移DPG逼近目标峰值位移DPTG,并且提高对目标反应谱的拟合精度。算例分析结果表明,该算法所得结果具有非常高的拟合精度。更多还原

【Abstract】 This paper proposed an artificial ground motion simulating method,which may be used to generate the artificial seismic ground shaking time history that satisfies both the target absolute acceleration response spectrum and the target peak ground displacement.Firstly,the method utilizes the traditional method,which modifies the Fourier amplitude spectrum in the frequency domain,to generate the initial acceleration time history,a(t),with the given peak ground acceleration(APG),response spectrum ST(ω,ζ),and intensity envelope being prescribed as targets;and then through superimposing the narrow-band time history in the time domain,the method further modulates a(t) to make its peak displacement approach the target peak ground displacement,i.e.,D PTG,as well as to improve its fitting precision to the target response spectrum.The numerical examples demonstrates that the results obtained by this proposed algorithm possess are with very high fitting precision.更多还原