PRETENS

Bulk Data Entry Defines 1D or 3D pre-tensioned bolt section.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PRETENS SID EID SURFID NTYP G1/X1/ CID G2 / X2 G3 / X3 SPNTID

Examples

1D pre-tensioned bolt:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PRETENS 2 5
3D pre-tensioned bolt:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PRETENS 3 4

Definitions

Field Contents SI Unit Example
SID Unique section identification number.
EID Element identification number of a bar, beam or rod element for defining 1D pre-tensioned bolt.

(Integer > 0 for 1D pre-tensioned bolt, or blank for 3D pre-tensioned bolt)
SURFID Identifier of SURF card which defines cutting section of 3D pre-tensioned bolt.

(Integer > 0 for 3D pre-tensioned bolt, or blank for 1D pre-tensioned bolt) 2
NTYP Type of determination of normal to the pretension section. 3
AUTO
Automatic determination based on the configuration of the pretension section.
GRIDS
Use G1, G2, G3 to define the plane of pretension - normal to this plane defines the pretension direction.
VECTOR
Use the vector X1, X2, X3 to define pretension direction.
CID
Use prescribed coordinate system.
blank (Default)
G1, G2, G3 Three grid identifiers that define the plane where it's normal is the direction of the bolt.

Default = blank (Integer > 0). When requested, all three nodes must be specified.
X1, X2, X3 Coordinates, in basic system, of the vector that defines direction of pretension.

Default = blank (Real). The length of the vector must be non-zero.
CID Identifier of a coordinate system that defines direction of pretension.

For rectangular system, the local x-axis defines the pretension direction.

For cylindrical and spherical systems, the local z-axis defines the pretension direction.

Default = blank (Integer > 0).
SPNTID SPOINT that defines the DOF containing the pretension deformation and load.

Default is not to output the pretension deformation in results files.

Comments

  1. Each 1D pretension section defines only one element.
  2. A surface defined by SURFID should be constructed by solid elements on the same side of the surface.
  3. The default direction of pretension is defined automatically from the configuration of the pretension section.
    • For 1D elements, it is along the axis of the respective 1D element.
    • For 3D pretension, it is defined as the average normal to the respective SURFace (average of respective element normals).