How we can apply moment release in nonlinearbeamcolumn element for 3d steel building (uniaxialmaterial hardening)in opensees?

10 January 2024 1 8K Report

My 3d building( 3 storey 6 bay 4 bay) showing very high stiffness and it is a combination of MRF and gravity frames. In place of gravity frames i want to release moment how can i achieve that.

Luis Claudio Pérez Tato

You can duplicate the node at the released end and impose equal displacements/rotations between the new node and the previous one, except for the released DOF.

If the member is not parallel to the coordinate axes, the previous solution doesn't work. In that case, you'll need to put a zero length element between the nodes with the adequate orientation and stiffness in each DOF.

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