General Spring Supports

 

 

 

Enter general nodal stiffness matrix (6 x 6), which includes the stiffness related to other degrees-of-freedom with respect to GCS or node's local coordinate system for selected nodes. Replace or delete previously defined spring stiffness.

 

Define the general node spring stiffness first to enter the general spring supports.

 

 

 

From the Main Menu select Model > Boundaries > General Spring Supports.

 

Select Geometry > Boundaries > General Spring Supports in the Menu tab of the Tree Menu.

 

 

 

Click to the right of General Spring Supports: Display the General Spring Support Table.

 

 Boundary Group Name

 

Select a Boundary Group in which the specified boundary condition is included. Select "Default" if Group assignment is unnecessary. Click to the right to prompt the "Define Boundary Group" dialog box to add, modify or delete Boundary Groups.

 

Options

 

Add/Replace: Enter or replace new general nodal spring stiffness of selected nodes

 

Delete: Delete previously entered general nodal spring stiffness of selected nodes

 

General Spring

 

General Spring Type
Select general nodal spring stiffness to be entered from the previously defined general spring stiffness.(Refer to "Define General Spring Type")

 

Click to the right to display the General Spring Type dialog box.

 

SDx: Spring stiffness in GCS x-direction (or node's local x-direction when defined)

 

SDy: Spring stiffness in GCS y-direction (or node's local y-direction when defined)

 

SDz: Spring stiffness in GCS z-direction (or node's local z-direction when defined)

 

SRx: Rotational spring stiffness about GCS x-axis (or node's local x-axis when defined)

 

SRy: Rotational spring stiffness about GCS y-axis (or node's local y-axis when defined)

 

SRz: Rotational spring stiffness about GCS z-axis (or node's local z-axis when defined)

 

Note
The above 6 spring stiffness values represent only the 6 diagonal terms in the 6 x 6 stiffness matrix entered in General Spring Type.