IfcUShapeProfileDef

Natural language names
U-Profil - parametrische Definition
UShape Profile Def
Définition de section d'un profil en U
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcUShapeProfileDef
      PositionMODIFIEDInstantiation changed to OPTIONAL.
      FilletRadiusMODIFIEDType changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure.
      EdgeRadiusMODIFIEDType changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure.
      CentreOfGravityInXXDELETED
Semantic definitions at the entity
Entity definition

IfcUShapeProfileDef defines a section profile that provides the defining parameters of a U-shape (channel) section 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.

HISTORY  New entity in IFC2x2.
IFC2x3 CHANGE  All profile origins are now in the center of the bounding box.
IFC4 CHANGE  Type of FilletRadius and EdgeRadius relaxed to allow for zero radius. Trailing attribute CentreOfGravityInX deleted, use respective property in IfcExtendedProfileProperties instead.

Figure 434 illustrates parameters of the U-shape profile definition.

U-shape profile

Position
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.

Figure 434 — U-shape profile

Attribute definitions
#AttributeTypeCardinalityDescription G
4DepthIfcPositiveLengthMeasure Web lengths, see illustration above (= h). X
5FlangeWidthIfcPositiveLengthMeasure Flange lengths, see illustration above (= b). X
6WebThicknessIfcPositiveLengthMeasure Constant wall thickness of web (= ts). X
7FlangeThicknessIfcPositiveLengthMeasure Constant wall thickness of flange (= tg). X
8FilletRadiusIfcNonNegativeLengthMeasure? Fillet radius according the above illustration (= r1).X
9EdgeRadiusIfcNonNegativeLengthMeasure? Edge radius according the above illustration (= r2).X
10FlangeSlopeIfcPlaneAngleMeasure? Slope of flange of the profile.X
Formal Propositions
RuleDescription
ValidFlangeThicknessThe flange thickness shall be smaller than half of the depth.
ValidWebThicknessThe web thickness shall be smaller than the flange width.
Inherited definitions from supertypes
Entity inheritance IfcParameterizedProfileDef IfcProfileDef
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcProfileDef
1ProfileTypeIfcProfileTypeEnum 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
2ProfileNameIfcLabel? 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
HasExternalReferenceIfcExternalReferenceRelationship
@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
HasPropertiesIfcProfileProperties
@ProfileDefinition
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
X
IfcParameterizedProfileDef
3PositionIfcAxis2Placement2D? Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied. X
IfcUShapeProfileDef
4DepthIfcPositiveLengthMeasure Web lengths, see illustration above (= h). X
5FlangeWidthIfcPositiveLengthMeasure Flange lengths, see illustration above (= b). X
6WebThicknessIfcPositiveLengthMeasure Constant wall thickness of web (= ts). X
7FlangeThicknessIfcPositiveLengthMeasure Constant wall thickness of flange (= tg). X
8FilletRadiusIfcNonNegativeLengthMeasure? Fillet radius according the above illustration (= r1).X
9EdgeRadiusIfcNonNegativeLengthMeasure? Edge radius according the above illustration (= r2).X
10FlangeSlopeIfcPlaneAngleMeasure? Slope of flange of the profile.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcProfileDef
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcUShapeProfileDef" type="ifc:IfcUShapeProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>
 <xs:complexType name="IfcUShapeProfileDef">
  <xs:complexContent>
   <xs:extension base="ifc:IfcParameterizedProfileDef">
    <xs:attribute name="Depth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="FlangeWidth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="WebThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="FlangeThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="FilletRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
    <xs:attribute name="EdgeRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
    <xs:attribute name="FlangeSlope" type="ifc:IfcPlaneAngleMeasure" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcUShapeProfileDef
 SUBTYPE OF (IfcParameterizedProfileDef);
  Depth : IfcPositiveLengthMeasure;
  FlangeWidth : IfcPositiveLengthMeasure;
  WebThickness : IfcPositiveLengthMeasure;
  FlangeThickness : IfcPositiveLengthMeasure;
  FilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
  EdgeRadius : OPTIONAL IfcNonNegativeLengthMeasure;
  FlangeSlope : OPTIONAL IfcPlaneAngleMeasure;
 WHERE
  ValidFlangeThickness : FlangeThickness < (Depth / 2.);
  ValidWebThickness : WebThickness < FlangeWidth;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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