Property - Pile

Function

Change the nodal coordinate system of selected nodes.

Call

Model > Element > Create Pile

General

ID

Property ID number
 

Name

Property Name.
 

Color

Select the color of Property.
 

Properties

Ultimate Shear Force

Limit Shear Resistance

Shear Stiffness Modulus

Inside Lateral Boundary Stiffness

Function

Select a function to define shear stiffness of boundary

If the function is not defined, click   button. (Refer to Model > Function...)

Normal Stiffness Modulus (Kn)

Slope of normal stress normal displacement curve or outside vertical boundary stiffness

Reference Depth

Reference depth of material model of Pile element

Slope of Friction-Rel. Disp. curve

Changing rate of relative displacement-friction curve at the allocated point.

Pile Tip Spring:  Enter Tip Bearing Capacity and Tip Spring Stiffness values.  Users can activate Pile tip spring for pile elements made using Create Pile (3d).  A point-to-solid interface element is created at the tip of each pile, connecting the end node of the pile beam to the surrounding 3D soil elements. This point-to-solid interface element has an internal orientation allowing the user to define a non-linear behavior between the beam and the soil in the axial direction of the pile. This non-linear behavior can be based on either perfect plasticity (high elastic stiffness and limited bearing capacity), or a user-defined multi-linear force-displacement diagram.

Tip Bearing Capacity: Maximum bearing force allowed at the pile tip

Tip Spring Stiffness: An initial elastic stiffness used before pile tip failure. If this option is chosen, the pile tip will behave elastically until reaching the specified bearing capacity where it then behaves in a perfectly plastic way. Note that it is advised to specify an elastic stiffness at the tip which is large enough to produce negligible displacement but smaller than the shear stiffness modulus of the shaft over the pile length in order to increase the robustness of the numerical analysis.

Function:  An alternative option to consider ‘Tip Spring Stiffness’. It allows the user to define a function relating the normalized tip reaction force to the relative axial displacement between the pile tip and the soil elements. Ultimately, the point-to-solid interface element will use a multi-linear force-displacement diagram resulting from the multiplication of this normalized function (unit insensitive) by the specified tip bearing capacity (unit sensitive).

Note: Pile tips will be created at the extremity of maximum X coordinate according to orientation of local element coordinate axis of pile elements. Therefore, users are advised to check the local coordinate axes of pile elements before performing the analysis.