8.15.3.6 IfcCenterLineProfileDef

8.15.3.6.1 Semantic definition

The profile IfcCenterLineProfileDef defines an arbitrary two-dimensional open, not self intersecting profile for the use within the swept solid geometry. It is given by an area defined by applying a constant thickness to a centerline, generating an area from which the solid can be constructed.

Among else, IfcCenterLineProfileDef is used to model cold-formed steel or aluminium sections (Sigma, Zeta, Omega, and similar sections which are not covered by subtypes of IfcParameterizedProfileDef). However, since IfcCenterLineProfileDef does not provide shape parameters except for the thickness, there is generally a need to further specify the profile definition by means of

• the name,
• external reference to a document or library,
• profile properties,

or a combination of them. See IfcProfileDef for guidance on external references for profiles.

Informal Propositions

1. The Curve has to be an open curve.
2. The Curve has to be a non-intersecting curve.

Figure 8.15.3.6.A illustrates the center line profile definition. The Curve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface that uses the profile definition. It is the xy plane of:

• IfcSweptSurface.Position

The Curve attribute defines a two dimensional open bounded curve. The Thickness attribute defines a constant thickness along the curve.

8.15.3.6.2 Entity inheritance

1. • IfcProfileDef
2. • IfcArbitraryOpenProfileDef
   • IfcArbitraryClosedProfileDef
   • IfcCompositeProfileDef
   • IfcDerivedProfileDef
   • IfcOpenCrossProfileDef
   • IfcParameterizedProfileDef
3. • IfcCenterLineProfileDef

8.15.3.6.3 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.
IfcArbitraryOpenProfileDef (1)
3	Curve	IfcBoundedCurve	Open bounded curve defining the profile.
Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes
IfcCenterLineProfileDef (1)
4	Thickness	IfcPositiveLengthMeasure	Constant thickness applied along the center line.

8.15.3.6.4 Property sets

• 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

8.15.3.6.5 Concept usage

Concept	Usage	Description
IfcProfileDef (1)
Property Sets for Profiles	General	This concept can be applied to the following resources: Pset_ProfileMechanical
Click to show 1 hidden inherited concepts Click to hide 1 inherited concepts

8.15.3.6.6 Formal representation

ENTITY IfcCenterLineProfileDef
 SUBTYPE OF (IfcArbitraryOpenProfileDef);
	Thickness : IfcPositiveLengthMeasure;
END_ENTITY;

8.15.3.6.7 References

• IfcArbitraryOpenProfileDef