首先,利用相位差分谱与非平稳强度包络线的相似关系确定地震动的相位角,根据速度谱与傅里叶幅值谱的形状相似来近似地震动的幅值谱,然后,通过在频域内调整傅里叶振幅谱的方法合成加速度时程.算例分析结果表明,该算法所得到的人工地震动时程对目标谱具有较好的精度.%Firstly, the phase angle is obtained by the similar relationships of the phase-difference and the prescribed intensity envelope, the amplitude spectrum is approximated based on the shape of the velocity spectrum,then a time history of acceleration compatible with the target response spectrum is generated by modifying the Fourier amplitude spectrum in the frequency domain. Numerical examples demonstrate that the artificial ground shaking time histories obtained by the proposed algorithm boast high fitting precisions to the target spectrum.
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