 | C-Profil - parametrische Definition |
 | CShape Profile Def |
 | Définition de section d'un profil en C |
| Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
|---|---|---|---|---|
| IfcCShapeProfileDef | ||||
| Position | MODIFIED | Instantiation changed to OPTIONAL. | ||
| InternalFilletRadius | MODIFIED | Type changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure. | ||
| CentreOfGravityInX | X | DELETED |
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.
HISTORY New entity in IFC2x2.
IFC2x3 CHANGE All profile origins are now in the center of the bounding box.
IFC4 CHANGE Type of InternalFilletRadius relaxed to allow for zero radius. Trailing attribute CentreOfGravityInX deleted, use respective property in IfcExtendedProfileProperties instead.
Figure 416 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.
Figure 416 — C-shape profile |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 4 | Depth | IfcPositiveLengthMeasure | Profile depth, see illustration above (= h). | X | |
| 5 | Width | IfcPositiveLengthMeasure | Profile width, see illustration above (= b). | X | |
| 6 | WallThickness | IfcPositiveLengthMeasure | Constant wall thickness of profile (= ts). | X | |
| 7 | Girth | IfcPositiveLengthMeasure | Lengths of girth, see illustration above (= c). | X | |
| 8 | InternalFilletRadius | IfcNonNegativeLengthMeasure | ? | Internal fillet radius according the above illustration (= r1). | X |
| Rule | 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. |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| IfcProfileDef | |||||
| 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. | X | |
| 2 | ProfileName | 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. | X |
| HasExternalReference | IfcExternalReferenceRelationship @RelatedResourceObjects | S[0:?] | Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
IFC4 CHANGE New inverse attribute | X | |
| HasProperties | IfcProfileProperties @ProfileDefinition | S[0:?] | Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute | X | |
| IfcParameterizedProfileDef | |||||
| 3 | Position | IfcAxis2Placement2D | ? | Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied. | X |
| IfcCShapeProfileDef | |||||
| 4 | Depth | IfcPositiveLengthMeasure | Profile depth, see illustration above (= h). | X | |
| 5 | Width | IfcPositiveLengthMeasure | Profile width, see illustration above (= b). | X | |
| 6 | WallThickness | IfcPositiveLengthMeasure | Constant wall thickness of profile (= ts). | X | |
| 7 | Girth | IfcPositiveLengthMeasure | Lengths of girth, see illustration above (= c). | X | |
| 8 | InternalFilletRadius | IfcNonNegativeLengthMeasure | ? | Internal fillet radius according the above illustration (= r1). | X |
| # | Concept | Template | Model View |
|---|---|---|---|
| IfcProfileDef | |||
| Property Sets for Objects | Property Sets for Objects | General Usage | |
<xs:element name="IfcCShapeProfileDef" type="ifc:IfcCShapeProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>
<xs:complexType name="IfcCShapeProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcParameterizedProfileDef">
<xs:attribute name="Depth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="Width" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="Girth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="InternalFilletRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
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;
EXPRESS-G diagram
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