Natural language names
Kreisprofil - hohl - parametrische Definition
Circle Hollow Profile Def
Définition de profil circulaire épais
Change log
      PositionMODIFIEDInstantiation changed to OPTIONAL.
Semantic definitions at the entity
Entity definition

IfcCircleHollowProfileDef defines a section profile that provides the defining parameters of a circular hollow section (tube) 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 (for symmetric profiles identical with the centre of gravity).

HISTORY  New entity in IFC2x2.

Figure 433 illustrates parameters of the circular hollow 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. Explicit coordinate offsets are used to define cardinal points (for example, upper-left bound). The parameterized profile is defined by a set of parameter attributes.

CHS-shape profile

Figure 433 — Circle hollow profile

Attribute definitions
#AttributeTypeCardinalityDescription G
5WallThicknessIfcPositiveLengthMeasure Thickness of the material, it is the difference between the outer and inner radius.X
Formal Propositions
WR1The wall thickness shall be smaller then the radius.
Inherited definitions from supertypes
Entity inheritance IfcCircleProfileDef IfcParameterizedProfileDef IfcProfileDef
Attribute inheritance
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
S[0:?]Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
IFC4 CHANGE New inverse attribute
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
3PositionIfcAxis2Placement2D? Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied. X
4RadiusIfcPositiveLengthMeasure The radius of the circle.X
5WallThicknessIfcPositiveLengthMeasure Thickness of the material, it is the difference between the outer and inner radius.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcCircleHollowProfileDef" type="ifc:IfcCircleHollowProfileDef" substitutionGroup="ifc:IfcCircleProfileDef" nillable="true"/>
 <xs:complexType name="IfcCircleHollowProfileDef">
   <xs:extension base="ifc:IfcCircleProfileDef">
    <xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
EXPRESS Specification
ENTITY IfcCircleHollowProfileDef
 SUBTYPE OF (IfcCircleProfileDef);
  WallThickness : IfcPositiveLengthMeasure;
  WR1 : WallThickness < SELF\IfcCircleProfileDef.Radius;

Link to EXPRESS-G diagram EXPRESS-G diagram

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