The Rocscience International Conference 2021 Proceedings are now available. Read Now
 

Search Results

Add Restraints/Displacements

Displacement, Restraint, or Free Restraint boundary conditions can be applied to surfaces, edges, or points using the menu/toolbar options or by convenient right-click shortcut, which opens the Add Restraint dialog. These boundary conditions can either be XYZ restraints (zero displacement) or fixed (non-zero) displacements.

To apply restraints or displacements to a face (surface), edge, or point:

  1. Select the Restraints Restraints workflow tab workflow tab.
  2. Based on the type of boundary on which you are applying the boundary condition, select Faces Selection Faces Selection icon , Edges Selection Edges Selection icon , or Vertices Selection Vertices selection icon as the Selection Mode.
  3. Select the face(s), edge(s), or vertice(s) on which to apply the restraint/displacement.
  4. Select to expand the Add Restraints/Displacements Add Restraints/Displacements icon sub-menu from the Restraints menu and choose the type of restraint to apply, or to apply the restraint directly from the toolbar (Restrain X, Restrain Y, etc.). In a multi-stage model, displacements may be staged. More information on staging displacements can be found below.
  5. TIP: with the face(s), edge(s), or vertices selected, you can also right-click on the viewing screen and select the restraint type from the Restraints sub-menu.

  6. When you have selected the type of restraint to be applied, select Apply. The restraint option you selected in Step 4 will be applied to the boundary selected in Step 3. Fixed restraints will be displayed in the viewport as pins, coloured to match the axis of the direction in which it is fixed. Displacements will be displayed in the viewport as arrows with values.

Restrain Type

The Restrain Types available in the Add Restraint dialog in RS3 are:

  • Restrain X
  • Restrain Y
  • Restrain Z
  • Restrain XY
  • Restrain YZ
  • Restrain XZ
  • Restrain XYZ
  • Free Restraints (Free XYZ)
  • Displacements

RESTRAIN X

The Restrain X Restrain X icon option is used to apply zero x-displacement boundary conditions. The nodes will be free to move in the y- and z-directions. The x-displacement will be fixed at zero throughout the analysis.

Nodes restrained in the x-direction are indicated by the "pin" symbol in the x-direction, coloured to match the x-axis (red), when Restraints are displayed.

RESTRAIN Y

The Restrain Y Restrain Y icon option is used to apply zero y-displacement boundary conditions. The nodes will be free to move in the x- and z-directions. The y-displacement will be fixed at zero throughout the analysis.

Nodes restrained in the y-direction are indicated by the "pin" symbol in the y-direction, coloured to match the y-axis (green), when Restraints are displayed.

RESTRAIN Z

The Restrain Z Restrain Z icon option is used to apply zero z-displacement boundary conditions. The nodes will be free to move in the x- and y-directions. The z-displacement will be fixed at zero throughout the analysis.

Nodes restrained in the z-direction are indicated by the "pin" symbol in the z-direction, coloured to match the z-axis (blue), when Restraints are displayed.

RESTRAIN XY

The Restrain XY Restrain XY icon option is used to apply pinned boundary conditions.

The nodes will not be free to move in the x- and y-directions, and will maintain zero displacement throughout the analysis.

Nodes restrained in the x- and y-directions are indicated by two "pin" symbols: a red "pin" in the x-direction and a green "pin" in the y-direction, when Restraints are displayed.

RESTRAIN YZ

The Restrain YZ Restrain YZ icon option is used to apply pinned boundary conditions.

The nodes will not be free to move in the y- and z-directions, and will maintain zero displacement throughout the analysis.

Nodes restrained in the y- and z-directions are indicated by two "pin" symbols: a green "pin" in the y-direction and a blue "pin" in the z-direction, when Restraints are displayed.

RESTRAIN XZ

The Restrain XZ Restrain XZ icon option is used to apply pinned boundary conditions.

The nodes will not be free to move in the x- and z-directions, and will maintain zero displacement throughout the analysis.

Nodes restrained in the x- and z-directions are indicated by two "pin" symbols: a red "pin" in the x-direction and a blue "pin" in the z-direction, when Restraints are displayed.

RESTRAIN XYZ

The Restrain XYZ Restrain XYZ icon option is used to apply pinned boundary conditions.

The nodes will not be free to move in the x- , y-, and z-directions, and will maintain zero displacement throughout the analysis.

Nodes restrained in the x-, y-, and z-directions are indicated by three "pin" symbols: a red "pin" in the x-direction, a green "pin" in the y-direction , and a blue "pin" in the z-direction, when Restraints are displayed.

FREE RESTRAINTS (FREE XYZ)

The Free Restraints Free Restraints icon (or Free XYZ) option is used to free any nodes that are restrained in the x-, y-, and z-directions. It also is used to ensure that all selected nodes will be free to move in the x-, y-, and z-directions. For example, if you are modeling a surface excavation, in most cases you will need to apply a Free boundary condition to all segments of the external boundary representing the ground surface.

The Free Restraints option can also be used to remove non-zero displacement boundary conditions that have been specified.

No symbol appears at nodes that are Free, since they are completely free to move with no restraints.

DISPLACEMENTS

The Displacements Displacements icon option is used to specify a non-zero, fixed displacement as a boundary condition for the stress analysis. A non-zero displacement boundary condition is similar to a zero displacement boundary condition. Rather than specifying that the displacement at a node is fixed and equal to zero, it is specified that the displacement at a node is fixed and equal to some non-zero value. The Displacement option can be used for back-analysis scenarios, in which boundary displacements are known, and the resulting stress state is to be determined.

To use this option, in the Add Restraint dialog, select the desired displacement for the x-, y-, and z-directions. The displacement in each direction may be Free, Displaced, or Fixed. A Free displacement will allow nodes to move freely in the specified direction. A Displaced displacement will fix the nodes at the desired value. A Fixed displacement will fix the nodes with a displacement equal to zero, with the nodes not free to move in the specified direction.

Staging

In a multi-stage model, the Staging options allow you to specify the stage at which the displacements will be installed and the stage at which the displacements will be removed. Displacements can be staged by selecting the Stage Values checkbox. Select the Add Stage Ad Stage icon button for each stage, enter the Type of displacement (Free, Displaced, or Fixed) to be used in the x-, y-, and z-directions and the value of the displacement for each stage.

If you do not stage the displacement on a multi-stage model, then the displacement will be applied with the same value at all stages.

Different stage values for X, Y and Z directions

If necessary, the displacements can be staged independently by selecting the Different stage values for X, Y and Z directions checkbox. If this checkbox is selected, you will be able to specify the Type and Value of the displacement in the x-, y-, and z-directions independently for each stage.

If your displacement is staged, it is a good idea to cycle through the Stage Tabs after adding the displacement boundary condition, to verify that the displacement(s) are applied at the correct stages and that the values are correct. If not, then repeat Steps 1 to 5 (above) or select and edit the displacement using the Properties Pane, and make sure that the correct Type and Values have been applied at the correct stages.

Account Icon - click here to log in or out of your account Shopping Cart icon Click here to search our site Click here to close Learning Tech Support Documentation Info Chevron Delete Back to Top View More" PDF File Calendar Location Language Fees Video Click here to visit Rocscience's LinkedIn page Click here to visit Rocscience's YouTube page Click here to visit Rocscience's Twitter page Click here to visit Rocscience's Facebook page Click here to visit Rocscience's Instagram page Bookmark Network Scroll down for more Checkmark Download Print Back to top Single User Multiple Users CPillar Dips EX3 RocFall RocPlane RocSupport RocTopple RS2 RS3 RSData RSPile Settle3 Slide2 Slide3 SWedge UnWedge Commercial License Education License Trial License Shop safe & secure Money-back guarantee