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)|
|$masterNodeTag||integer tag identifying the master node|
|$slaveNodeTag1 $slaveNodeTag2 ...||integar tags identifying the slave 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).
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