The rod cross-section is dedicated mostly to tension elements. It can be found in the library of profiles; nevertheless, its applicability is limited to two manufacturing operations only: the connecting plate and the gusset plate.
Here are the main dimensions when using the operation Connecting plate - Notched plate - rectangle:
And here, when you use Gusset plate:
In both cases, the profile is not meshed by shell elements like all others; therefore the software does not present results on them. The check of such a member has to be done in the 3D global analysis model. Despite this, the adjacent welds are checked as usual.
See more in the following video: