8.15.3.11 IfcEllipseProfileDef

8.15.3.11.1 Semantic definition

IfcEllipseProfileDef defines an ellipse as the profile definition used by the swept surface geometry or the swept area solid. It is given by its semi axis attributes and placed within the 2D position coordinate system, established by the Position attribute.

Figure 8.15.3.11.A illustrates parameters for the ellipse profile definition. The parameterized profile defines its own position 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:

• IfcSweptSurface.Position
• IfcSweptAreaSolid.Position

Or in case of sectioned spines it is the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. By using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile. Explicit coordinate offsets are used to define cardinal points (for example, upper-left bound). The location of the position coordinate system defines the center of the ellipse. The SemiAxis1 attribute defines the first radius of the ellipse in the direction of the X axis, the SemiAxis2 attribute defines the second radius of the ellipse in the direction of the Y axis.

8.15.3.11.2 Entity inheritance

1. • IfcProfileDef
2. • IfcParameterizedProfileDef
   • IfcArbitraryClosedProfileDef
   • IfcArbitraryOpenProfileDef
   • IfcCompositeProfileDef
   • IfcDerivedProfileDef
   • IfcOpenCrossProfileDef
3. • IfcEllipseProfileDef
   • IfcAsymmetricIShapeProfileDef
   • IfcCShapeProfileDef
   • IfcCircleProfileDef
   • IfcIShapeProfileDef
   • IfcLShapeProfileDef
   • IfcRectangleProfileDef
   • IfcTShapeProfileDef
   • IfcTrapeziumProfileDef
   • IfcUShapeProfileDef
   • IfcZShapeProfileDef

8.15.3.11.3 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.
IfcParameterizedProfileDef (1)
3	Position	OPTIONAL IfcAxis2Placement2D	Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.
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IfcEllipseProfileDef (2)
4	SemiAxis1	IfcPositiveLengthMeasure	The first radius of the ellipse. It is measured along the direction of Position.P[1].
5	SemiAxis2	IfcPositiveLengthMeasure	The second radius of the ellipse. It is measured along the direction of Position.P[2].

8.15.3.11.4 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

8.15.3.11.5 Concept usage

Concept	Usage	Description
IfcProfileDef (1)
Property Sets for Profiles	General	This concept can be applied to the following resources: Pset_ProfileMechanical
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8.15.3.11.6 Formal representation

ENTITY IfcEllipseProfileDef
 SUBTYPE OF (IfcParameterizedProfileDef);
	SemiAxis1 : IfcPositiveLengthMeasure;
	SemiAxis2 : IfcPositiveLengthMeasure;
END_ENTITY;

8.15.3.11.7 References

• IfcParameterizedProfileDef