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Add Elevation Load

Elevation distributed loads, which vary linearly between two points of different elevation (i.e. the z-coordinate of each point differs) along a boundary, can be applied to edges or faces with the Add Loads option and specifying Elevation Load as the Load Type. The load distribution is treated as triangular (zero at one end) or trapezoidal (different non-zero values at each end) based on the user-specified Top Magnitude/Delta and the elevation of the boundaries.

Elevation Distributed Load on vertical slope face

To apply an Elevation distributed load by projecting a region onto geometry:

  1. Select the Loading & Support Loading and Support Tab workflow tab.
  2. Select Add Loads Add Load Icon from the toolbar or the Loading menu.
  3. You will see the Add Load dialog. In this dialog:
      • select the Load Type = Elevation Load
      • enter the Top Magnitude / Delta of the load
      • specify the load Orientation (e.g. Normal, Local +x, Local +y, Local +z, Vector (x,y,z), or Trend/Plunge)
      • specify location and orientation of the load region

    See below for details about the load magnitude and orientation.

  4. When finished specifying the load properties and the preview of the applied load, select OK. The Elevation distributed load will be applied to the selected face(s), as indicated by the display of red arrows and the magnitude.
  5. Check the direction of the arrows and the magnitude, to make sure that this is the load you wished to apply. If there is a mistake, you can select Undo and repeat the above steps to apply the correct load, or select and edit the load using the Properties Pane to change the load parameters.

To apply an Elevation distributed load to a face:

  1. Select the Loading & Support Loading and Support Tab workflow tab.
  2. Select Faces Selection Front Face Box Icon as the Selection Mode.
  3. Select face(s) on which to apply the load.
  4. Select Add Loads Selected Add Load Icon from the toolbar or the Loading menu. TIP: with the face(s) selected, you can also right-click on the viewing screen and select Add Loads from the Loading sub-me
  5. You will see the Add Load dialog. In this dialog:
    • select the Load Type = Elevation Load
    • enter the Top Magnitude / Delta of the load
    • specify the load Orientation (e.g. Normal, Local +x, Local +y, Local +z, Vector (x,y,z), or Trend/Plunge)
  6. See below for details about the load magnitude and orientation.

  7. When finished specifying the load properties and the preview of the applied load, select OK. The Elevation distributed load will be applied to the selected face(s), as indicated by the display of red arrows and the magnitude.
  8. Check the direction of the arrows and the magnitude, to make sure that this is the load you wished to apply. If there is a mistake, you can select Undo and repeat the above steps to apply the correct load, or select and edit the load using the Properties Pane to change the load parameters.

To apply an Elevation Load to an edge (line load) repeat the Steps 1 to 7, but use Edges Selection Box Edges Icon to select the edge(s) on which to apply the load.

Top Magnitude / Delta of Load

The Top Magnitude is the magnitude of the load that will be applied at the top, or highest point, of the selected boundary (edge or face). The Delta is the change in the load magnitude per unit decrease in elevation. NOTE:

  • Delta = 0 means that the magnitude of the load does not change with a decrease in elevation (z-coordinate). This type of Elevation Load is equivalent to a Uniform Load.
  • Delta > 0 means that the magnitude of the load increases as the elevation of the boundary decreases (i.e. the load magnitude at the bottom of the boundary is greater than the Top Magnitude).
  • Delta < 0 means that the magnitude of the load decreases as the elevation of the boundary decreases (i.e. the load magnitude at the bottom of the boundary is less than the Top Magnitude).

Load Magnitude

A distributed load magnitude is generally entered as a positive value. The direction of load application is specified by selecting an appropriate Orientation method (see below) in the Add Load dialog. If a negative load magnitude is entered, the direction of the applied load will be reversed.

NOTE: if Delta < 0 and the absolute value of Delta multiplied by the change in elevation is greater than the Top Magnitude (i.e. |Delta * change in elevation| > Top Magnitude), then the load at the bottom of the boundary will be in the reverse direction to the load at the top of the boundary.

Load Orientation

For details about defining the load Orientation, see the Uniform Load topic, as the same information applies to both Uniform and Elevation loads.

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