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 $direction $rNodeTag $cNodeTag1 $cNodeTag2 ...

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$direction	3D models - direction perpendicular to the rigid plane, e.g., direction 3 (Z) corresponds to the 1-2 (X-Y) plane); 2D models - direction of diaphragm motion, e.g., direction 1 (X) corresponds to motion constrained in the X direction)
$rNodeTag	integer tag identifying the retained node
$cNodeTag1 $cNodeTag2 ...	integer tags identifying the constrained nodes

NOTE: The constraint object is constructed assuming small rotations for 3D models.

EXAMPLE:

3D:

rigidDiaphragm 2 2 4 5 6; constrain nodes 4,5,6 to move as if in the same X-Z plane as node 2

2D:

rigidDiaphragm 1 5 1 3 4 7; constrain nodes 1,3,4,7 to have the same X displacement as node 5

Code Developed by: fmk