5 . the multi - point effect in frequency domain is studied , and the analytical procedure is simplified to some extent , that is , the responding data is accurate enough only with the input according to the first four degressively arranged eigenvalue of earthquake power spectrum matrix . there are disaccordant conclusions of multi - point input analys 5 、研究了频域内地震动的多点效应，并对计算过程进行了一定程度的简化，即只需要计算输入地震动功率谱矩阵从大到小排列的前4个特征值所对应的地震动的动力反应。
