Tie
Multipoint Constraint Implemented As Element
Number of Nodes: varies
Number of DoFs: varies
Syntax
element Tie (1) (2) (3) [(4) (5) (6)...]
# (1) int, unique element tag
# (2) double, right hand side of the constraint equation, the constraint is homogeneous if this parameter is zero
# (3) double, penalty number, a relatively large number
# (4) int, node tag
# (5) int, dof tag
# (6) double, weight
Example
Each Tie
element can have multiple DoFs included. For example, to define the following constraint,
where and are horizontal displacement of node 2
and vertical displacement of node 4
in a 2D model, then
element Tie 1 9. 1E8 2 1 5. 4 2 6.
In the above command, a large number 1E8
is used as penalty.
The Tie
element does not care about the geometric implication. The tied DoFs can be of different types.
To tie a node to a line, consider the TranslationConnector
element.
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