peteroznewman
Subscriber
One place where the stiffness of your model is too high is the bottom of the columns. The model has a boundary condition on the bottom of the column that is infinitely stiff. The real column bottom goes into a base providing flexibility to the bottom of the column. You can add flexibility to the model by introducing a rotational spring between the bottom of a column and a rigid body to represent the base. The displacement is then applied to the base.
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