【摘要】 提出一种以绝对加速度反应谱和峰值速度为目标的合成人造地震动时程的方法.该方法首先利用传统的在频域内调整傅里叶幅值谱的方法,生成以给定峰值加速度、反应谱和强度包线为目标的初始加速度时程a(g0)(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(g0)(t),以使其峰值速度逼近目标峰值速度,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很高的拟合精度.更多还原

【Abstract】 In this paper, a method, which synthesizes the artificial ground motion compatible with the specified peak velocity as well as the target acceleration response spectrum, was proposed. In this method, firstly, an initial acceleration time history a~ (0) _g(t), which satisfies the prescribed peak ground acceleration, the target spectral acceleration S_T (ω, ζ) , and the specified intensity envelope, is generated by the traditional method that generates the response-spectrum-compatible artificial ground motion by modifying the Fourier amplitude spectrum in the frequency domain; secondly, a~ (0) _g(t) is further modulated by superimposing narrow-band time histories upon it in the time domain to make its peak velocity approach the target peak ground velocity, and at the same time to improve its fitting precision to the target spectrum. Numerical examples show that this algorithm boasts high calculation precisions.更多还原