IfcCircleHollowProfileDef

BACnet MVD

#### IfcCircleHollowProfileDef

Natural language names

| Kreisprofil - hohl - parametrische Definition
| Circle Hollow Profile Def
| Définition de profil circulaire épais

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcCircleHollowProfileDef |  |  |  |
Position |  |  | MODIFIED | Instantiation 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 360 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:

- 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. 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.

Figure 360 — Circle hollow profile

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
5 | WallThickness | IfcPositiveLengthMeasure |  | Thickness of the material, it is the difference between the outer and inner radius. | X | X

Formal Propositions

Rule | Description
--- | ---
WR1 | The wall thickness shall be smaller then the radius.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
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 | 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 | 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 | X
IfcCircleProfileDef
4 | Radius | IfcPositiveLengthMeasure |  | The radius of the circle. | X | X
IfcCircleHollowProfileDef
5 | WallThickness | IfcPositiveLengthMeasure |  | Thickness of the material, it is the difference between the outer and inner radius. | X | X

##### Examples

- Beam varying profiles

##### Formal representations

XML Specification
`<xs:element name="IfcCircleHollowProfileDef" type="ifc:IfcCircleHollowProfileDef" substitutionGroup="ifc:IfcCircleProfileDef" nillable="true"/>
<xs:complexType name="IfcCircleHollowProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcCircleProfileDef">
<xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCircleHollowProfileDef
SUBTYPE OF (IfcCircleProfileDef);
WallThickness : IfcPositiveLengthMeasure;
WHERE
WR1 : WallThickness < SELF\IfcCircleProfileDef.Radius;
END_ENTITY;

EXPRESS-G diagram

`

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