Dynamic impedance of a pipe pile in layered soils under vertical excitations: Fid-Bau Portal

Dynamic impedance of a pipe pile in layered soils under vertical excitations

Ai, Zhi Yong / Liu, Chun Lin

AbstractThis paper investigates the dynamic impedance of a vertically loaded pipe pile embedded in layered soils. The dynamic response of pipe piles is governed by the 1D vibration theory, which is formulated as a series of matrix equations. Meanwhile, the dynamic solution for layered soils is achieved by the application of the stiffness matrix deduced from the analytical layer-element method. Based on the displacement compatibility and traction equilibrium at the interface between the pipe pile and both inner and outer soils, the dynamic pipe pile-soil interaction equations are established and solved efficiently. The validity and accuracy of the proposed method are demonstrated by the solutions of vertical impedances of a solid pile and a pipe pile embedded in a homogeneous half-space. Some numerical results are presented to explore the effects of wall thickness, length-radius ratio and layering of soils on the vertical impedances of pipe piles.

Highlights•The dynamic response of pipe piles is governed by the 1D vibration theory.•The dynamic solution for soils is achieved using the analytical layer-element method.•The interaction equations are established through the continuity conditions.•Effects of wall thickness, length-radius ratio and layering of soil are investigated.