地震地面运动模型的研究

STUDY OF MODEL OF EARTHQUAKE GROUND MOTION

地震地面运动被模拟成均值为零的两次过滤Gauss白噪声随机过程。第一次过滤削减白噪声的高频含量；第二次过滤削减白噪声的低频含量。根据地震记录的功率谱，使用非线性函数的最小二乘法，确定了两次过滤Gauss白噪声随机过程的功率谱密度函数的参数。

The earthquake ground motion is modeled as a twice filtered gaussian white noise random process with zero mean. The high frequency content of the white noise is reduced by the first filter;the low frequency content of the white noise is cut down by the second filter. On the basis of power spectra of earthquake records,the parameters of the power spectral density function of the twice filtered Gaussian white noise random process are determined by using the least -squares procedure of a nonlinear function.