Dynamic analysis of piles subjected to axial and lateral loading with emphasis on soil and interface nonlinearities

摘要

The beam on Winkler foundation model (BWF) is widely used in Geotechnical Engineering for the analysis of pile foundations against static and dynamic loading. The effectiveness of a BWF approach lies in the appropriate calibration of the model parameters accounting for the soil reaction against the deflecting pile. Soil and interface non-linearities (slippage and separation of the pile from the soil), frequency-dependent visco-plastic response (radiation damping) and cyclic hysteretic soil behaviour are inherent components of dynamic pile-soil interaction that should be sufficiently taken into consideration in the analysis. In this paper, a series-parallel assembly of non-linear frequency-independent springs and dashpots is presented for the lateral and axial pile response, capable of capturing the aforementioned complex features of soil reaction. The predictions of the developed soil reaction model compare satisfactorily with results from finite element analysis with the use of code PLAXIS.