8.15.3.5 IfcCShapeProfileDef

8.15.3.5.1 Semantic definition

IfcCShapeProfileDef defines a section profile that provides the defining parameters of a C-shaped section to be used by the swept area solid. This section is typically produced by cold forming steel. 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.

Figure 8.15.3.5.A illustrates parameters of the C-shape 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. The parameterized profile is defined by a set of parameter attributes. In the illustrated example, the 'CentreOfGravityInX' property in IfcProfileProperties, if provided, is negative.

Figure 8.15.3.5.A — C-shape profile

8.15.3.5.2 Entity inheritance

- IfcProfileDef

8.15.3.5.3 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.
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IfcCShapeProfileDef (5)
4	Depth	IfcPositiveLengthMeasure	Profile depth, see illustration above (= h).
5	Width	IfcPositiveLengthMeasure	Profile width, see illustration above (= b).
6	WallThickness	IfcPositiveLengthMeasure	Constant wall thickness of profile (= ts).
7	Girth	IfcPositiveLengthMeasure	Lengths of girth, see illustration above (= c).
8	InternalFilletRadius	OPTIONAL IfcNonNegativeLengthMeasure	Internal fillet radius according the above illustration (= r1).

Table 8.15.3.5.B

8.15.3.5.4 Formal propositions

Name	Description
ValidGirth	The girth shall be smaller than half of the depth.
`Girth < (Depth / 2.)`
ValidInternalFilletRadius	If the value for InternalFilletRadius is given, it shall be small enough to fit into the inner space.
`NOT(EXISTS(InternalFilletRadius)) OR ((InternalFilletRadius <= Width/2. - WallThickness) AND (InternalFilletRadius <= Depth/2. - WallThickness))`
ValidWallThickness	The WallThickness shall be smaller than half of the Width and half of the Depth.
`(WallThickness < Width/2.) AND (WallThickness < Depth/2.)`

Table 8.15.3.5.C

8.15.3.5.5 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

8.15.3.5.6 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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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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Table 8.15.3.5.D

8.15.3.5.7 Formal representation

ENTITY IfcCShapeProfileDef
 SUBTYPE OF (IfcParameterizedProfileDef);
	Depth : IfcPositiveLengthMeasure;
	Width : IfcPositiveLengthMeasure;
	WallThickness : IfcPositiveLengthMeasure;
	Girth : IfcPositiveLengthMeasure;
	InternalFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
 WHERE
	ValidGirth : Girth < (Depth / 2.);
	ValidInternalFilletRadius : NOT(EXISTS(InternalFilletRadius)) OR
((InternalFilletRadius <= Width/2. - WallThickness) AND (InternalFilletRadius <= Depth/2. - WallThickness));
	ValidWallThickness : (WallThickness < Width/2.) AND (WallThickness < Depth/2.);
END_ENTITY;

8.15.3.5.8 References

IfcParameterizedProfileDef