IFC (IFC4X3) development IfcArbitraryOpenProfileDef Semantic definition

The open profile IfcArbitraryOpenProfileDef defines an arbitrary two-dimensional open profile for the use within the swept surface geometry. It is given by an open boundary from which the surface can be constructed.

Informal Propositions:

  1. The Curve has to be an open curve.

Figure illustrates the arbitrary open 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:

The Curve attribute defines a two dimensional open bounded curve.

arbitrary profile without boundaries
Figure — Arbitrary open profile Entity inheritance 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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IfcArbitraryOpenProfileDef (1)
3 Curve IfcBoundedCurve

Open bounded curve defining the profile.

Table Formal propositions

Name Description

The profile type is a .CURVE., an open profile can only be used to define a swept surface.

 (SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE)

The dimensionality of the curve shall be 2.

Curve.Dim = 2
Table 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 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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Table Formal representation

ENTITY IfcArbitraryOpenProfileDef
 SUBTYPE OF (IfcProfileDef);
	Curve : IfcBoundedCurve;
 (SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
	WR12 : Curve.Dim = 2;
END_ENTITY; References

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