IfcRectangleHollowProfileDef

BACnet MVD

#### IfcRectangleHollowProfileDef

Natural language names

| Rechteckprofil hohl - parametrische Definition
| Rectangle Hollow Profile Def

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcRectangleHollowProfileDef |  |  |  |
Position |  |  | MODIFIED | Instantiation changed to OPTIONAL.
InnerFilletRadius |  |  | MODIFIED | Type changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure.
OuterFilletRadius |  |  | MODIFIED | Type changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure.

##### Semantic definitions at the entity

Entity definition

IfcRectangleHollowProfileDef defines a section profile that provides the defining parameters of a rectangular (or square) hollow section to be used by the swept surface geometry or the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. A square hollow section can be defined by equal values for h and b. The centre of the position coordinate system is in the profiles centre of the bounding box (for symmetric profiles identical with the centre of gravity). Normally, the longer sides are parallel to the y-axis, the shorter sides parallel to the x-axis.

> HISTORY New entity in IFC2x2.

> IFC4 CHANGE Types of InnerFilletRadius and OuterFilletRadius relaxed to allow for zero values.

Figure 372 illustrates parameters of a rectangular or square hollow profile definition.

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 372 — Rectangle hollow profile

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
6 | WallThickness | IfcPositiveLengthMeasure |  | Thickness of the material. | X | X
7 | InnerFilletRadius | IfcNonNegativeLengthMeasure | ? | Inner corner radius. | X | X
8 | OuterFilletRadius | IfcNonNegativeLengthMeasure | ? | Outer corner radius. | X | X

Formal Propositions

Rule | Description
--- | ---
ValidWallThickness | The wall thickness shall be smaller than half of the X and Y dimension of the rectangle.
ValidInnerRadius | The inner fillet radius (if given) shall be small enough to fit into the void.
ValidOuterRadius | The outer fillet radius (if given) shall be small enough to fit into the bounding box.

##### 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
IfcRectangleProfileDef
4 | XDim | IfcPositiveLengthMeasure |  | The extent of the rectangle in the direction of the x-axis. | X | X
5 | YDim | IfcPositiveLengthMeasure |  | The extent of the rectangle in the direction of the y-axis. | X | X
IfcRectangleHollowProfileDef
6 | WallThickness | IfcPositiveLengthMeasure |  | Thickness of the material. | X | X
7 | InnerFilletRadius | IfcNonNegativeLengthMeasure | ? | Inner corner radius. | X | X
8 | OuterFilletRadius | IfcNonNegativeLengthMeasure | ? | Outer corner radius. | X | X

##### Formal representations

XML Specification
`<xs:element name="IfcRectangleHollowProfileDef" type="ifc:IfcRectangleHollowProfileDef" substitutionGroup="ifc:IfcRectangleProfileDef" nillable="true"/>
<xs:complexType name="IfcRectangleHollowProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcRectangleProfileDef">
<xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
<xs:attribute name="InnerFilletRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
<xs:attribute name="OuterFilletRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcRectangleHollowProfileDef
SUBTYPE OF (IfcRectangleProfileDef);
WallThickness : IfcPositiveLengthMeasure;
InnerFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
OuterFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
WHERE
ValidWallThickness : (WallThickness < (SELF\IfcRectangleProfileDef.XDim/2.)) AND
(WallThickness < (SELF\IfcRectangleProfileDef.YDim/2.));
ValidInnerRadius : NOT(EXISTS(InnerFilletRadius)) OR
((InnerFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2. - WallThickness)) AND
(InnerFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2. - WallThickness)))
;
ValidOuterRadius : NOT(EXISTS(OuterFilletRadius)) OR
((OuterFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND
(OuterFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)));
END_ENTITY;

EXPRESS-G diagram

`

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