本文将桩基平台理想化为三维多级子结构模型。采用Krylov和Bogoliubov提出的方法将非线性土壤弹簧线性化。由广义Morison公式引入的拖曳力中的速度非线性项亦通过逐次迭代予以线性化。对线性的平台结构部分采用逐级凝聚,对最高级线性子结构模式则采用了动态修正。在每次重分析中只须对非线性的土壤刚度及阻尼进行修正,然后求解一个大大降阶的随机响应方程。计算实例表明,本文的处理方法具有良好的计算效率与精度。 In this paper, the pile-base platform is idealized as a three-dimensional multilevel substructure model. Nonlinear soil springs were linearized using the method proposed by Krylov and Bogoliubov. The velocity nonlinearity term in the drag force introduced by the generalized Morison formula is also linearized by successive iterations. Gradual aggregation is applied to the linear platform structure, and dynamic correction is applied to the most advanced linear substructure model. In each reanalysis, only nonlinear soil stiffness and damping need to be modified, and then a greatly reduced stochastic response equation is solved. Calculation examples show that the processing method of this paper has good calculation efficiency and accuracy.