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Friday, March 19, 2010

Adjusting Joist Seat Depth Separately on Each End - The Revit Clinic

Repost: http://revitclinic.typepad.com/my_weblog/2010/03/adjusting-joist-seat-depth-separately-on-each-end.html

I had a support request recently where we discussed how to adjust the web joist families so the seat depth could be modified separately on each end (by default both ends are controlled together with one parameter). I thought it was a valuable topic to write a post on.

For my example, I will use the LH-Series Bar Joist. If you open up that family and switch to the Back elevation view, you should see the existing Seat Depth dimension and its associated reference plane:

Seat depth 01

The first step would be to delete this dimension and reference plane.

Next, select one of the seat extrusions on either end.

Seat depth 02

Go to Modify Extrusion > Clipboard > Cut, and then Modify > Clipboard > Paste Aligned > Same Place. This will break the existing constraints for the extrusion.

There are a couple of constraints you will then need to add. Go to Modify > Edit > Align to activate the align tool to set the following constraints:

1. Select the reference plane on one end of the extrusion. Then select the edge of the extrusion. Lock this alignment.

Seat depth 03


2. Select the reference plane on the other end of the extrusion. Then select the edge of the extrusion. Lock this alignment.

Seat depth 04


3. Select the edge of the member above. Then select the edge of the extrusion that coincides with it. Lock this alignment.

Seat depth 05


Now, you'll need to add a new depth parameter. Place an Aligned Dimension from the top to bottom:

Seat depth 06


With the dimension selected, go to the Options bar, select the Label pulldown and choose . Name the parameter as desired:

Seat depth 07


Now follow these steps for the other side - but choose a different name for the parameter - and you should be able to control them separately.


Source: Adjusting Joist Seat Depth Separately on Each End - The Revit Clinic


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