悬浮桩水平振动的动力刚度

通过将悬浮桩截面下土体等效为土桩，利用桩的水平振动土阻抗结果，分析了桩、土桩构成的组合桩在频率域内的动力响应，给出了黏弹性土层中黏弹性悬浮桩水平振动动力刚度的半解析解，得到了动力刚度随各种物性参数的变化曲线。在此基础上，研究了物性参数对刚度的影响，对比了细长桩和短粗桩的响应差异。结果表明，悬浮桩水平振动的动态刚度受桩长、土的软硬程度、水平激振频率等的影响，这些结果可以为工程设计提供参考依据。

Dynamical stiffnesses of a floating pile in horizontal vibration

By regarding the soil portion below the pile as a soil-pile and using the existed results of the soil resistance to horizontally vibrating pile, the dynamical behavior of the composite pile composed of the pile and virtual soil-pile, is analyzed; and the semi-analytical solutions for the dynamical stiffness of viscoelastic floating pile in a viscoelastic soil layer are obtained in the frequency domain. The variations of the stiffnesses with various physical parameters are shown in figures. Then, the influences of the material parameters on the stiffness are discussed; and the behavior differences between more slender and less slender piles are examined. It is shown that the dynamical stiffnesses of the floating piles depend on the pile length, soil property and excitation frequency. The results presented here are helpful for pile design.