PROPERTY LOADS PRESSURE [lname] [lnumb] part [opart] pres [dof]

          

This command is used to apply distributed loads.

lname = name of the loading, used for later references.

lnumb = loadcase number (integer, default=1).

part = part to be loaded, line, surface or set .

opart = optional part of next higher order from loaded part, which contains the elements to be loaded. Only required when there is ambiguity over which elements are to be loaded. See note 2.

pres = size of pressure load.

dof = direction of pressure load. 0 or NORMAL = normal to element face/edge (default) 1 or X = global x 2 or Y = global y 3 or Z = global z

The PROPERTY LOADS PRESSURE command applies a distributed load on all elements on a part of a structure. The distributed load can either be applied on a line or on a surface. In both cases there are two possibilities:

a line with elements = line load on beams; for the `NORMAL' direction a positive pressure acts in the negative z direction of the beam local axis.

a line without elements = line load on one side of a surface e.g. axi-symmetric

(edge of a surface) elements, for the `NORMAL' direction a positive pressure acts in the plane of the elements in the inward direction.

a surface with elements = distributed load on shell elements, for the 'NORMAL' direction a positive pressure acts in the direction of the surface normal.

a surface without elements = distributed load on one face of body elements, for the `NORMAL' direction (face of a body) a positive pressure acts in the direction of the inward normal to the body.

Notes:

1.

Loadcase numbers
The loadcase number is only used by the pre-interface programs to group loads together. If no number is given the default is 1.

2.

Ambiguous loading
Ambiguity over which elements are loaded will only arise when the part that is loaded is attached to more than one other part, (for example where a load is applied to a line which is attached to two surfaces). Any ambiguity about which elements will be loaded can be resolved by specifying the part containing the elements to be loaded in the definition of the load.
The command is restricted to only allow certain combinations of parts i.e. point/line, line/surface and surface/body. In the case of sets, a similar relationship is required between the parts in the set.
If the load is to be applied to several of the parts sharing the loaded part, the command should be repeated for each part containing elements.
If the second (optional) part is not given then the load is applied to the part with the lower entity number.

3.

`NORMAL' loads on lines
Most of the interfaces do not support a `NORMAL' load on beam elements, instead it is necessary to specify the required direction (dof).

Examples:

1.

PROPERTY LOADS PRESSURE LO1 1 L1 5.23 X

Create and apply pressure load name LO1 in loadcase 1 to line L1 with value 5.23 in the x-direction.

2.

PROPERTY LOADS PRESSURE LO2 2 S2 10.0 NORM

Create and apply a pressure load LO2 in loadcase 2 to surface S2, value 10.0, normal to the surface.

3.

PROPERTY LOADS PRESSURE L111 S3 123 0

Create and apply a pressure load on line l111. The elements in surface S3 and connected to line l111 will be loaded, with the direction of loading being in the plane of surface S3. If line L111 is not connected to surface S3 an error message will be generated.

See also the following commands

'LABEL GEOMETRY LOADS'
'LABEL MESH LOADS'
'UTILITY DELETE LOADS'
'UTILITY TABULATE GEOMETRY LOADS'