Member forces can be applied to members after they have been placed.
Depending on the release definition there may be a variety of forces and moments that can be applied.
When you switch on the local coordinate axes in the visibility graphics overrides, positive axis ends in the “end” node. The opposite side is the “start” node.
Also note that there may be an offset between the section and the neutral axis of the member as per the z orientation and the y orientation. The analysis will therefore not be perfectly correct based on classical solutions, but within some tolerance that will have the solution fall within your chosen factor of safety.
A fixed end means that there is basically a weld on the end. It is not possible therefore to apply other forces or moments.
With a pinned element, you can apply a moments about the x-axis, y-axis and z-axis, the degree of freedom being dependent on the release definition.
A bending moment connection seems to exclude the z-axis as a degree of freedom.
User Defined seems to free up all possibilities regardless of the release definition.
To enter values for the forces and moments, First uncheck all the fields then edit the values.
Unfortunately, it is not possible to see the values once you apply them. I created a Revit Idea that you can vote for.
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