Drag chain element library | ||||||||
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ProductsAbaqus/Standard
Element types
- DRAG2D
Two-dimensional drag chain, for use in cases where only horizontal motion is being studied
- DRAG3D
Three-dimensional drag chain
Active degrees of freedom
DRAG2D: 1, 2
DRAG3D: At the first node: 1, 2, 3. At the second node: 1, 2, 3, 4, 5, 6.
Additional solution variables
None.
Nodal coordinates required
DRAG2D: (X, Y) coordinates of the pipeline attachment node in the horizontal plane.
DRAG3D: (X, Y, Z) coordinates of both nodes.
Element property definition
Input File Usage
Use the following option to define the horizontal length at slip and the friction limit:
DRAG CHAIN
Use the following option to define the seabed for DRAG3D elements:
RIGID SURFACE
The rigid surface must be flat and parallel to the global (X, Y) plane.
Element-based loading
None.
Element output
- S11
The horizontal component of force supported by the drag chain in the plane parallel to the seabed.
- S12
The vertical component of force in the drag chain for DRAG3D elements.
- E11
The horizontal length of the drag chain for DRAG2D elements. The length of chain on the seabed floor (not suspended) for DRAG3D elements.
- E12
The orientation of the drag chain (angle from the global X-axis).
Nodes associated with the element
DRAG2D: One node at the position where the chain attaches to the pipe.
DRAG3D: Two nodes. The first node is the node where the chain attaches to the pipe; the second node is the “reference node” of the rigid body containing the rigid surface that defines the seabed.