What is the condition of 1D members in common nodes by default?

maysam
maysam Altair Community Member
edited October 2020 in Community Q&A

When you connect 1D members to each other, how's the connections by default (it'll be pinned together or rigid)? and how can I change it?

Thank you in advance.

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2012

    Hi,

    For implicit solutions. e.g. Nastran or Radioss bulk, the default is the connection of all DOF's.

    This is determined by the PIN flags. Look in 1D->Bars->Pins a=, pins b=

    pins = a or pins = b means (e.g. for BEAM):

    'Pin flags for beam ends A and B respectively. Used to remove connections between the grid point and selected degrees-of-freedom of the beam. The degrees-of-freedom are defined in the element’s coordinate system and the pin flags are applied at the offset ends of the beam. The beam must have stiffness associated with the PA and PB degrees-of-freedom to be released by the pin flags. For example, if PA=4, the PBEAM entry must have a non-zero value for J, the torsion stiffness.

    Regards,

    Mario

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