Creating a Deck Longitudinal Stiffener

This task explains creation of a deck longitudinal stiffener with limits.  The image below shows longitudinal stiffeners (highlighted) placed on a deck.





1. With your document open, click the Stiffener button to open the Stiffener dialog box. If you select the plate on which you want to place the stiffener before you open the dialog box it will be pre-selected. You can change the selection by clicking in the Plate field and selecting a plate in the specifications tree, or in the viewer.

  2. Category: Select a category by clicking the down arrow in the Category field. The last 10 categories you selected will be displayed. If deck longitudinal stiffener is not displayed then click More to display the Class Browser and make your selection.
  3. Name: The application can assign a name to the object you are creating using the object naming function if you check the Automatic checkbox. If you want to assign your own name then uncheck the box and enter a name.
  4. Support: Select a support. Click in the Support field if it is not selected, then select a support. The support will define a 'trace' on the plate, which the stiffener will follow when it is placed. You can select any of the following:
  • Plane
  • A surface that intersects the plate - you can create your own surface if you need to
  • Grid

The stiffener is placed when you select a support. The image below shows stiffeners that have been placed on a deck.

You can also select a support by displaying the Plane Systems dialog box. Right click on the Support field to display the Plane Systems dialog box. Select a system or sub-system by clicking on the arrow, and then select a plane, or you can key in the plane in the Key in Planes field. In the image below the user has keyed in LONG.5+100. +100 is the offset, as explained in Step 5.

Click the button next to the Support field to display the Elements List. You can use the list to delete or replace supports that you have added. To replace, select the support, click the Replace button, then select the new support.

  5. Offset: Enter a value in the Offset field if you need it. This is the value by which the stiffener will be offset from the support you selected. The value is expressed in the units selected in your workbench. Enter a negative (-) sign in front of the value to offset it in the opposite direction.
  6. Limits: By default, stiffeners are placed from end to end of the plate you selected. If you need to resize a stiffener, you have to define the limits.

Under Limits, in the Name field, select Start and select a starting limit. You can select a plane, plate, another stiffener or a surface. The stiffener is limited as soon as you make your selection.

Use the same method to define the End. The images below show a stiffener that has not been limited, and one that has been limited at the end.

Under Offset, you can define the offset value of each stiffener limit.

  7. Invert Stiffener: The Invert Stiffener button becomes available when you have defined one limit - start or end. Clicking this button inverts the stiffener limit in a toggling action. The image below shows the effect of the Invert Stiffener function on the stiffener that was limited in the previous step.

  8. Angle: To place the web of a stiffener at an angle, make sure the support object you select (plane, surface) is at an angle, and select the Along Plane option. The stiffener is placed at that angle. The default angle is the last one used.

NOTE: When creating a stiffener using a curve as a support, the Along Plane angle has no effect. Use the Normal to Plate option.