关键词: Timoshenko模型, 动力刚度, 端承桩, 水平振动, 桩-土相互作用

Abstract: Based on a continuum model of interaction between pile and soil, dynamic characteristics of horizontal vibration of a Timoshenko type end-bearing pile in a linear viscoelastic soil layer is studied by making the pile equivalent to a Timoshenko beam and using the existing results of soil resistance. Semi-analytical expressions of dynamic stiffness of the pile head is presented in the frequency domain. Variations of stiffness with respect to frequency are shown in terms of figures. Influences of the material and geometry parameters on stiffness are discussed. The results are compared with those obtained from the Euler-Bernoulli type model. It is shown that the dynamic stiffness of the end-bearing pile depends on the pile’s slenderness ratio, soil property and excitation frequency. The results presented are useful in pile design.

Key words: dynamic stiffness, end-bearing pile, horizontal vibration, interaction between pile and soil, Timoshenko model