RigidDiaphragm command: Difference between revisions
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This command is used to construct a number of Multi-Point Constraint (MP_Constraint) objects. These objects will | 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. | ||
{| | {| | ||
| style="background:yellow; color:black; width:800px" | '''rigidDiaphragm $perpDirn $ | | style="background:yellow; color:black; width:800px" | '''rigidDiaphragm $perpDirn $rNodeTag $cNodeTag1 $cNodeTag2 ...''' | ||
|} | |} | ||
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| style="width:150px" | '''$perpDirn ''' || direction perpendicular to the rigid plane (i.e. direction 3 corresponds to the 1-2 plane) | | style="width:150px" | '''$perpDirn ''' || direction perpendicular to the rigid plane (i.e. direction 3 corresponds to the 1-2 plane) | ||
|- | |- | ||
| '''$ | | '''$rNodeTag ''' || integer tag identifying the retained node | ||
|- | |- | ||
| '''$ | | '''$cNodeTag1 $cNodeTag2 ... ''' || integer tags identifying the constrained nodes | ||
|} | |} | ||
Revision as of 15:43, 13 June 2020
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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 ... |
| $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