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 IfcExtendedProfileProperties, if provided, is negative.
8.15.3.5.2 Entity inheritance
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. |
|
| 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. |
| Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes | |||
| 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). |
8.15.3.5.4 Formal propositions
| Name | Description |
|---|---|
| ValidGirth |
The girth shall be smaller than half of the depth. |
|
|
| ValidInternalFilletRadius |
If the value for InternalFilletRadius is given, it shall be small enough to fit into the inner space. |
|
|
| ValidWallThickness |
The WallThickness shall be smaller than half of the Width and half of the Depth. |
|
|
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: |
|
| Click to show 1 hidden inherited concepts Click to hide 1 inherited concepts | |||
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;