Numerical Analysis on Bearing Behavior of Tubular Pile Under Composite Load

The 3D FEM numerical model was adopted to study the bearing behavior of tubular piles under composite load considering influencing factors such as the nonlinear geometric properties of the tubular pile soil system, coupling interaction between steels and concrete. The result shows that: (1) Increasing the vertical load gradually when the lateral load remains constant, the lateral displacements of the every segments in the pile are increased gradually, the moment of the every segments in the pile is decreased gradually, the shear of the every segments in the pile is decreased gradually; (2) Increasing the lateral load gradually when the vertical load remains constant, the settlement of the top and the bottom in the pile are both decreased gradually, the compression amount of the pile is decreased gradually, the limit of the friction resistance in the side of the pile is decreased gradually, so that the bottom resistance of the pile plays more and more important effect.