Function

Enter Spring Stiffness of selected nodes in each direction of GCS or nodal local coordinate system. Replace or remove previously defined spring stiffness.
Call
From the main menu, select [Boundary] tab > [Springs] group > [Point Spring]
Input
Right ... button of Point Spring Supports
Display Point Spring Support Table
Boundary Group Name
Select the Boundary Group to include the entered boundary conditions. If group specification is not necessary, select "Default". To add or modify a Boundary Group, click the button to open the "Define Boundary Group" dialog box.
Options
Add : Add new spring stiffness to selected nodes
Replace : Replace previously defined spring stiffness of selected nodes
Delete : Delete previously defined spring stiffness of selected nodes
Point Spring
Linear Type : Enter the stiffness of linear elastic spring.
SDx : Spring stiffness in GCS Xdirection (or nodal local xdirection when defined)
SDy : Spring stiffness in GCS Ydirection (or nodal local ydirection when defined)
SDz : Spring stiffness in GCS Zdirection (or nodal local zdirection when defined)
SRx : Rotational spring stiffness about GCS Xaxis (or nodal local xaxis when defined)
SRy : Rotational spring stiffness about GCS Yaxis (or nodal local yaxis when defined)
SRz : Rotational spring stiffness about GCS Zaxis (or nodal local zaxis when defined)
Fixed : Stiffness of the selected component is automatically entered as very large value (SDx, SDy, SDZ: 1e+13kN/m, SRx, SRy, SRz: 1e+16kN/m). This option is useful when the user wants to consider the spring stiffness only in a certain direction without defining Support at the same nodes additionally.
Damping Constant
Cx : Damping constant in GCS Xdirection (or nodal local xdirection when defined)
Cy : Damping constant in GCS Ydirection (or nodal local ydirection when defined)
Cz : Damping constant in GCS Zdirection (or nodal local zdirection when defined)
CRx : Rotational Damping constant about GCS Xaxis (or nodal local xaxis when defined)
CRy : Rotational Damping constant about GCS Xaxis (or nodal local xaxis when defined)
CRz : Rotational Damping constant about GCS Zaxis (or nodal local zaxis when defined)
Compression/Tension Only Type : Enter the compressiononly/tensiononly type elastic spring.
Stiffness : Tensiononly/compressiononly spring stiffness about the xaxis direction of the local element coordinate system.
Direction : Enter the direction of a spring with respect to the node local coordinate system.
Compressiononly / Tensiononly Type of Point Spring Support cannot be applied to Dynamic Analysis.
MultiLinear Type : Enter the multilinear type elastic spring.
MultiLinear Type : Enter the tensile stiffness and compressive stiffness of a spring symmetrically or asymmetrically.
Compression in a spring is defined to be the positive (+) displacement. That is, the stiffness shown in the first quadrant of the left guide diagram represents the stiffness of a spring subjected to compression.
ForceDeformation Function : The user can directly input the history of spring stiffness. The last stiffness (k, slope) will be maintained beyond the input range.
Direction : Enter the direction of a spring with respect to the node local coordinate system.
1. Multilinear Type of Point Spring Support cannot be applied to Dynamic Analysis.
2. The slopes in the external sections, which are not defined by the user, are based on the same slopes defined by the last two nodes.