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:

IfcSweptAreaSolid.Position

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.

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. IFC4-CHANGE New inverse attribute
	HasProperties	SET [0:?] OF IfcProfileProperties FOR ProfileDefinition	Additional properties of the profile, for example mechanical properties. IFC4-CHANGE New inverse attribute
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
IfcCircleHollowProfileDef (1)
5	WallThickness	IfcPositiveLengthMeasure	Thickness of the material, it is the difference between the outer and inner radius.

Table 8.15.3.7.C

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.D

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: Pset_ProfileMechanical
Click to show 1 hidden inherited concepts

Concept

Usage

Description

IfcProfileDef (1)

Click to show 1 hidden inherited concepts

Table 8.15.3.7.E

8.15.3.7.7 Examples

Figure 8.15.3.7.B

Beam Varying Profiles

8.15.3.7.8 Formal representation

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

8.15.3.7.9 References

IfcCircleProfileDef

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