假定土层的剪切模量随深度线性变化，得到土层的最大位移反应的均值和方差。
Assuming that shear modulus of the soil foundation is linear along depth, the mean and the variance of the maximal displacement response are obtained.
研究结果表明：在简谐地面加速度作用下，高频地震动也可以引起长周期结构产生很大的位移反应，且最大位移反应出现在结构的瞬态自由振动阶段。
It is concluded that the transient response to a high frequency harmonic ground motion can increase greatly the displacement response of structures, particularly for the long period structures.
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