Research On The Simplified Analysis Method For Response Of Vertical Nonlinearity Of Single Piles

The response of vertical nonlinear of single piles is studied in this paper. Firstly, one 3-D finite element model which can reflect the influence of nonlinear factors is constructed using one finite element analysis software ANSYS, with which, the vertical response of single piles at the action of different kinds of loads, and the influences of all kinds of geometrical and physical parameters and nonlinear factors on the vertical response of single piles have been researched overall. Secondly, adopted Bouc-Wen model describing the constitutive relation of delayed nonlinear material, on this basis of the Beam-on-Winker-Foundation model, one new simplified analysis model has been established, which can consider the influences of all kinds of nonlinear factors and research the response of vertical nonlinearity of single piles. This model can simulate the vertical nonlinear action force of ground soil to the pile shaft, with the vertical nonlinear springs of uniform distribution in pace with depth, and the restoring force of nonlinear spring, and can be described by Bouc-Wen model. All computational parameters are of soil mechanics, which can be determined and calibrated through the current design codes and on-site experiment data curves. Lastly, combining two actual engineering examples and using this model and its related calculating method, this simplified analysis model has been verified, and the influence of all kinds of systematic parameters and nonlinear factors on the vertical response of single piles has been discussed further. The results of calculation show that the simplified analysis model set up in this dissertation can simulate efficiently the response problems of vertical nonlinearity of single piles, possessing some practicality.