RigidDiaphragm command

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This command is used to construct a number of Multi-Point Constraint (MP_Constraint) objects. These objects will constrain certain degrees-of-freedom at the listed constrained nodes to move as if in a rigid plane with the retained node.

rigidDiaphragm $perpDirn $rNodeTag $cNodeTag1 $cNodeTag2 ...

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$perpDirn	direction perpendicular to the rigid plane (i.e. direction 3 corresponds to the 1-2 plane)
$rNodeTag	integer tag identifying the retained node
$cNodeTag1 $cNodeTag2 ...	integer tags identifying the constrained nodes

NOTE: The constraint object is constructed assuming small rotations.

NOTE: The rigidDiaphragm command works only for problems in three dimensions with six-degrees-of-freedom at the nodes (ndf = 6).

EXAMPLE:

rigidDiaphragm 2 2 4 5 6; constrain nodes 4,5,6 to move as if in the same x-z plane as node 2.

Code Developed by: fmk