# zone gridpoint force-reaction command

Syntax

zone gridpoint force-reaction <keyword> <range>

Primary keywords:

For each gridpoint in the range, in each of the the specified degree-of-freedoms, checks if the gridpoint is fixed in that direction. If it is, then the fixity condition is removed and an applied force is created (as with zone gridpoint fix force-applied) that is equal and opposite to the reaction force present. Assuming the model was in equilibrium, the gridpoint will have removed the fixity condition and still be in equilibrium.

all

Create reaction forces in all degrees-of-freedom. This is the default value.

x

Create reaction forces in the local $$x$$-direction only.

y

Create reaction forces in the local $$y$$-direction only.

z

Create reaction forces in the local $$z$$-direction only.