Beam element line pressure load possible error.

GermanGerman
I think there is a problem with beam line pressure load.
In the attached model the solution is all zeros, but nodes rotations should not be zero.
stiffness matrix is ok but load vector is all zeros but it shold be
0.
0.
-16666.666666667
0.
0.
16666.666666667

so solution shoud be
0.
0.
-0.0396825396825
0.
0.
0.0396825396825

Reaction forces are OK, so I think that there is a problem with nodal equivalent forces calculation, equivalent moments are missing.

Comments

  • VictorVictor
    You're right, line pressure doesn't include the bending moments so you have to refine the mesh for them to appear due to the forces on nodes along the span.

    The same is true for pressure on shells.

    Would you say this is an important omission?
  • GermanGerman
    Why moments are not included in load?
  • VictorVictor
    Not particular reason. It just didn't seem important at the time.
  • GermanGerman
    It is important if somebody wants to modle a frame structure without refining each beam.
    If there are only nodal loads it is not necesary to refine, and it would be fine if this can work with line pressure loads too.
  • VictorVictor
    I see. I've added it to my list but not sure when I'll get to it.
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