Supports

Boundary: Supports

Function	Restrain the degrees-of-freedom of selected nodes. Replace or remove the previously defined support conditions.

Call	Model > Boundary > Supports

<Supports>		BC Set Select a Boundary Set in which the specified boundary condition is included Click to the right to prompt the Define Boundary Set dialog box to add, modify or delete Boundary Sets. If the user types the name of the Boundary Set directly in the entry box, GTS will automatically create the relevant Boundary Set. Type Face Flux Apply surface flux value on planar elements or face of solid elements. Edge Flux Apply surface flux value on line elements or edge of planar elements. Object Type Select a method for selecting nodes where the Surface flux will be assigned. Surface Select Surface on which the boundary condition will be applied. Free Face Element Select free face of solid elements. Curve Select Curves on which the boundary condition will be applied. Free Edge Element Select free edge of planar elements. Free Face Node It becomes active when the Free Face Node selection method is designated. Seed Node Select a Seed Node which becomes the reference for determining the free face. Feature Angle After expanding the free face selection from the Seed Node, it only selects element nodes within the specified Feature Angle. Click to select the free face nodes, and they will appear on the screen. Mode Add Add new restraints to the selected nodes Replace Replace the previously defined restraints on the selected nodes Delete When adding new restraints, this option applies restraints only to the unassigned nodes. Apply to Unassigned Objects Only When adding a new surface flux value, this option applies nodal head value only to the unassigned nodes. DOF UX, UY, UZ Displacement degree-of-freedom in the Global Coordinate Axes. RX, RY,RZ Rotational degree-of-freedom in the Global Coordinate Axes. The following buttons simplify the individual data entries described above. Fixed: Restrain all DOFs. Free: Unrestrain all DOFs. Pinned: Restrain only displacement DOFs. No Rotation : Restrain only rotational DOFs. Symmetry More prescribed restrains can be specified using the following symmetric conditions. Plane12: Restrain nodes symmetric about the Global X-Y plane. Plane23: Restrain nodes symmetric about the Global Y-Z plane. Plane31: Restrain nodes symmetric about the Global X-Z plane. Anti-Symmetry More prescribed restrains can be specified using the following anti-symmetric conditions. Plane12: Restrain nodes anti-symmetric about the Global X-Y plane. Plane23: Restrain nodes anti-symmetric about the Global Y-Z plane. Plane31: Restrain nodes anti-symmetric about the Global X-Z plane.

Example: Constraining DOF of Beam

In cases where the DOF direction is not normal to GCS, following procedure can be used:

Solid box:

Coordinate = 0,0,0

Length = 200, Width = 200, Height = 200

Auto Mesh Solid: Element Size 40 and set Attribute ID to 1.

1) Model > Node > Change CSys. Refer to Figure 2. Please see left to create proper mesh example of solid box.

2) Click on the "Coordinate System" icon just to the far right. A "Coordinate System" dialog box will appear.

3) In Coordinate System box, confirm "Method" set to 3 Points. Refer to Figure 3.

4) Enter "Name" ie TEST

5) Set "Type" Rectangular

6) Plane 12 refers to x-y

7) Select the origin, Point on Axis 1 (x axis). Point on Plane 12 (plane xy) using nodal snap function. Click Apply. Refer to Figure 4. Preview to see modified coordinate system for 6 selected nodes.

8) Return to the Change Node CSys. As an example, select the 6 nodes shown in Figure 2. and

9) Scroll down to the CSys to TEST.

Boundary: Supports

Function

Call