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This command is used to construct a number of Multi-Point Constraint (MP_Constraint) objects. These objects will constraint certain degrees-of-freedom at the listed slave nodes to move as if in a rigid plane with the master node.
rigidDiaphragm $perpDirn $masterNodeTag $slaveNodeTag1 $slaveNodeTag2 ...
$perpDirn |
direction perpendicular to the rigid plane (i.e. direction 3 corresponds to the 1-2 plane) The rigid plane can be the 1-2, 1-3 or 2-3 plane |
$masterNodeTag |
integer tag identifying the master node |
$slaveNodeTag1 $slaveNodeTag2 ... |
nodes that are to be constrained to the master node |
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.
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