IFC 4.3.0.0 (IFC4X3) final

8.15.3.1 IfcArbitraryClosedProfileDef

8.15.3.1.1 Semantic definition

The closed profile IfcArbitraryClosedProfileDef defines an arbitrary two-dimensional profile for the use within the swept surface geometry, the swept area solid or a sectioned spine. It is given by an outer boundary from which the surface or solid can be constructed.

Informal Propositions:

  1. The OuterCurve has to be a closed curve.
  2. The OuterCurve shall not intersect.

Figure 8.15.3.1.A illustrates the arbitrary closed profile definition. The OuterCurve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. The OuterCurve attribute defines a two dimensional closed bounded curve.

arbitrary profile without boundaries
Figure 8.15.3.1.A — Arbitrary closed profile

8.15.3.1.2 Entity inheritance

8.15.3.1.3 Attributes

# Attribute Type Description
IfcProfileDef (4)
1 ProfileType IfcProfileTypeEnum

Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid.
2 ProfileName OPTIONAL IfcLabel

Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference.
HasExternalReference SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects

Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition

Additional properties of the profile, for example mechanical properties.
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IfcArbitraryClosedProfileDef (1)
3 OuterCurve IfcCurve

Bounded curve, defining the outer boundaries of the arbitrary profile.
Table 8.15.3.1.C

8.15.3.1.4 Formal propositions

Name Description
WR1

The curve used for the outer curve definition shall have the dimensionality of 2.

 
OuterCurve.Dim = 2
WR2

The outer curve shall not be of type IfcLine as IfcLine is not a closed curve.

 
NOT('IFC4X3.IFCLINE' IN TYPEOF(OuterCurve))
WR3

The outer curve shall not be of type IfcOffsetCurve2D as it should not be defined as an offset of another curve.

 
NOT('IFC4X3.IFCOFFSETCURVE2D' IN TYPEOF(OuterCurve))
Table 8.15.3.1.D

8.15.3.1.5 Property sets

  • Pset_ProfileArbitraryDoubleT
    • OverallWidth
    • LeftFlangeWidth
    • RightFlangeWidth
    • OverallDepth
    • FlangeDepth
    • FlangeDraft
    • FlangeChamfer
    • FlangeBaseFillet
    • FlangeTopFillet
    • StemBaseWidth
    • StemTopWidth
    • StemBaseChamfer
    • StemTopChamfer
    • StemBaseFillet
    • StemTopFillet
  • Pset_ProfileMechanical
    • MassPerLength
    • CrossSectionArea
    • Perimeter
    • MinimumPlateThickness
    • MaximumPlateThickness
    • CentreOfGravityInX
    • CentreOfGravityInY
    • ShearCentreZ
    • ShearCentreY
    • MomentOfInertiaY
    • MomentOfInertiaZ
    • MomentOfInertiaYZ
    • TorsionalConstantX
    • WarpingConstant
    • ShearDeformationAreaZ
    • ShearDeformationAreaY
    • MaximumSectionModulusY
    • MinimumSectionModulusY
    • MaximumSectionModulusZ
    • MinimumSectionModulusZ
    • TorsionalSectionModulus
    • ShearAreaZ
    • ShearAreaY
    • PlasticShapeFactorY
    • PlasticShapeFactorZ

8.15.3.1.6 Concept usage

Concept Usage Description
IfcProfileDef (1)
Property Sets for Profiles General

This concept can be applied to the following resources:
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IfcArbitraryClosedProfileDef (1)
Property Sets for Profiles General

This concept can be applied to the following resources:
Table 8.15.3.1.E

8.15.3.1.7 Examples

8.15.3.1.8 Formal representation 

ENTITY IfcArbitraryClosedProfileDef
 SUPERTYPE OF (ONEOF
	(IfcArbitraryProfileDefWithVoids))
 SUBTYPE OF (IfcProfileDef);
	OuterCurve : IfcCurve;
 WHERE
	WR1 : OuterCurve.Dim = 2;
	WR2 : NOT('IFC4X3.IFCLINE' IN TYPEOF(OuterCurve));
	WR3 : NOT('IFC4X3.IFCOFFSETCURVE2D' IN TYPEOF(OuterCurve));
END_ENTITY;

8.15.3.1.9 References