IFC (IFC4X3) development IfcCShapeProfileDef 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 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:

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 IfcExtendedProfileProperties, if provided, is negative.

C-shape profile
Figure — C-shape 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.

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 Formal propositions

Name Description

The girth shall be smaller than half of the depth.

Girth < (Depth / 2.)

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))

The WallThickness shall be smaller than half of the Width and half of the Depth.

(WallThickness < Width/2.) AND (WallThickness < Depth/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 IfcCShapeProfileDef
 SUBTYPE OF (IfcParameterizedProfileDef);
	Depth : IfcPositiveLengthMeasure;
	Width : IfcPositiveLengthMeasure;
	WallThickness : IfcPositiveLengthMeasure;
	Girth : IfcPositiveLengthMeasure;
	InternalFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
	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; References

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  • where rule, ValidGirth
  • where rule, ValidInternalFilletRadius
  • where rule, ValidWallThickness
  • attribute, CentreOfGravityInX
  • where rule, WR1
  • where rule, WR2
  • where rule, WR3
  • attribute InternalFilletRadius type, Changed from "IfcPositiveLengthMeasure" to "IfcNonNegativeLengthMeasure"