Structural usage Automatic issue

[Ajay_J_S]

Hi all. I came across this issue, I don't know whether this is a bug or issue or something else. As per the instructions given on Autodesk help page:https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-20636739-8508-4EF1-AE8F-607E921B84BC , when I draw the beam on top or inside the Structural wall, the structural usage automatically assigns Girder which is absolutely correct, but when I do Pick lines and select the walls centerline or edges the automatic goes to other instead of Girder. I have enclosed a video for more detail below. Appreciate if someone helps

@revit

[jay_colcombe]

In this scenario when you are manually drawing the Beam it is not using another Revit Element to define how it is interacting but more the points of reference of that object so ultimately it chooses the highest hierarchy level as there is no directly interaction.

Whereas in the second beam placement you are now using another element to define placement and interaction so then uses the default Revit methodology as set in the Table.

Help | About the Structural Usage of Beams | Autodesk

[Ajay_J_S]

Hi not understood your answer. Could you please elaborate in detail! Appreciate your help

[jay_colcombe · Accepted solution]

Your First Beam was drawn independently and you determined the length of the beam using the Wall End Points for placement only!

The second beam was created using the Wall as a placement guide so the length was determined by the Wall directly so has as direct relationship to the wall!

It could be simple as the End points are for multiple walls it cannot considerate it as Primary?

[jay_colcombe · Accepted solution]

Looking into this further it is as simple as when the Beam is placed using the Wall it does not have a dedicated Start and End point so is deemed not fully supported at its ends so is defined as Other where picking points does as and then can use the Table.

Typical example below, even though the short beam is on the wall it is not supported at both ends so cannot be deemed a Primary member but more of a cantilever.  Where the other Beam is supported at both ends so can be considered a Primary Beam using the Table for Automatic Structural Usage