IFC 4.3.0.1 (IFC4X3) development

8.15.3.7 IfcCircleHollowProfileDef

8.15.3.7.1 Semantic definition

IfcCircleHollowProfileDef defines a section profile that provides the defining parameters of a circular hollow section (tube) to be used by the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration.The centre of the position coordinate system is in the profile's centre of the bounding box (for symmetric profiles identical with the centre of gravity).

Figure 8.15.3.7.A illustrates parameters of the circular hollow profile definition. The parameterized profile defines its own position coordinate system. The underlying coordinate system is defined by the swept area solid that uses the profile definition. It is the xy plane of:

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 parameterized profile is defined by a set of parameter attributes.

CHS-shape profile
Figure 8.15.3.7.A — Circle hollow profile

8.15.3.7.2 Entity inheritance

8.15.3.7.3 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.

IfcCircleProfileDef (1)
4 Radius IfcPositiveLengthMeasure

The radius of the circle.

Click to show 6 hidden inherited attributes Click to hide 6 inherited attributes
IfcCircleHollowProfileDef (1)
5 WallThickness IfcPositiveLengthMeasure

Thickness of the material, it is the difference between the outer and inner radius.

Table 8.15.3.7.B

8.15.3.7.4 Formal propositions

Name Description
WR1

The wall thickness shall be smaller then the radius.

WallThickness < SELF\IfcCircleProfileDef.Radius
Table 8.15.3.7.C

8.15.3.7.5 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

8.15.3.7.6 Concept usage

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

This concept can be applied to the following resources:

Click to show 1 hidden inherited concepts Click to hide 1 inherited concepts
Table 8.15.3.7.D

8.15.3.7.7 Formal representation

ENTITY IfcCircleHollowProfileDef
 SUBTYPE OF (IfcCircleProfileDef);
	WallThickness : IfcPositiveLengthMeasure;
 WHERE
	WR1 : WallThickness < SELF\IfcCircleProfileDef.Radius;
END_ENTITY;

8.15.3.7.8 References

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