Dummy Dynamic Step to recover Beam’s rotational DOF’s inside EQUATION.

disladisla
Hi,

No rotational degrees of freedom are allowed in nodes of MPC’s in which no knot was created. For that reason, Equation doesn’t work with rotational DOFs of beams.
Some posts ago I suggested a way to induce knots on beams, but it has the drawback that creation of dummy elements is required.
There is another option which doesn’t need them based on this comment on the manual:

- A node leads to a knot if a rotation or a moment is applied in the node (only for dynamic calculations).

One needs to create a first Dummy Dynamic Step imposing a zero rotation on the nodes of interest. Then the knot is created, which is later available for the next Static Step.

Comments

  • disladisla
    Example attached.
    Mecway warning about “Rotational DOF do not apply to beam or shell elements with the ccx solver” is sorted out.
    Hopefully Victor finds a way to implement this.

  • VictorVictor
    Wow. I never knew there was any way to get rotational DOFs in equations! It's a bit of a pity that you have to keep one unused to put the dummy constraint on so it probably can't really be done automatically, but excellent discovery nonetheless!
  • disladisla
    It's a bit of a pity that you have to keep one unused to put the dummy constraint on


    That's the one the user wants to release.
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