#### IfcAsymmetricIShapeProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The IfcAsymmetricIShapeProfileDef defines a section profile that provides the defining parameters of an asymmetric I-shaped section to be used by the swept area solid. The bottom flange is always wider than the top flange. 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 profiles centre of the gravity bounding box.

The centre of gravity, if given, is located in x direction within the center of the bounding box, and in y-direction along the negative y axis, the offset value is given by the offset parameter CentreOfGravityInY.

> NOTE: The inherited attributes are used to define:
> - OverallWidth -- BottomFlangeWidth
> - FlangeThickness -- BottomFlangeThickness
> - FilletRadius -- BottomFlangeFilletRadius.

> HISTORY New entity in Release IFC2x Edition 2.
> IFC2x Edition 3 CHANGE All profile origins are now in the center of the bounding box. The attribute CentreOfGravityInY has been made OPTIONAL. Upward compatibility for file based exchange is guaranteed.

Illustration:

| 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. Explicit coordinate offsets are used to define cardinal points (e.g. upper-left bound). Parameter The parameterized profile is defined by a set of parameter attributes, see attribute definition below.

Table: Parameters of asymmetric I-shaped section definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
9 | TopFlangeWidth | IfcPositiveLengthMeasure | [1:1] | Extent of the top flange, defined parallel to the x axis of the position coordinate system. | X
10 | TopFlangeThickness | - |  | This attribute is out of scope for this model view definition and shall not be set. |
11 | TopFlangeFilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
12 | CentreOfGravityInY | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcProfileDef
1 | ProfileType | IfcProfileTypeEnum | [1:1] | 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 | - |  | This attribute is out of scope for this model view definition and shall not be set. |
IfcParameterizedProfileDef
3 | Position | IfcAxis2Placement2D | [1:1] | Position coordinate system of the parameterized profile definition. | X
IfcIShapeProfileDef
4 | OverallWidth | IfcPositiveLengthMeasure | [1:1] | Total extent of the width, defined parallel to the x axis of the position coordinate system. | X
5 | OverallDepth | IfcPositiveLengthMeasure | [1:1] | Total extent of the depth, defined parallel to the y axis of the position coordinate system. | X
6 | WebThickness | IfcPositiveLengthMeasure | [1:1] | Thickness of the web of the I-shape. The web is centred on the x-axis and the y-axis of the position coordinate system. | X
7 | FlangeThickness | IfcPositiveLengthMeasure | [1:1] | Flange thickness of the I-shape. Both, the upper and the lower flanges have the same thickness and they are centred on the y-axis of the position coordinate system. | X
8 | FilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
IfcAsymmetricIShapeProfileDef
9 | TopFlangeWidth | IfcPositiveLengthMeasure | [1:1] | Extent of the top flange, defined parallel to the x axis of the position coordinate system. | X
10 | TopFlangeThickness | - |  | This attribute is out of scope for this model view definition and shall not be set. |
11 | TopFlangeFilletRadius | - |  | This attribute is out of scope for this model view definition and shall not be set. |
12 | CentreOfGravityInY | - |  | This attribute is out of scope for this model view definition and shall not be set. |

##### Formal representations

XSD Specification
`<xs:element name="IfcAsymmetricIShapeProfileDef" type="ifc:IfcAsymmetricIShapeProfileDef" substitutionGroup="ifc:IfcIShapeProfileDef" nillable="true"/>
<xs:complexType name="IfcAsymmetricIShapeProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcIShapeProfileDef">
<xs:attribute name="TopFlangeWidth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcAsymmetricIShapeProfileDef
SUBTYPE OF (IfcIShapeProfileDef);
TopFlangeWidth : IfcPositiveLengthMeasure;
TopFlangeThickness : OPTIONAL IfcStrippedOptional;
TopFlangeFilletRadius : OPTIONAL IfcStrippedOptional;
CentreOfGravityInY : OPTIONAL IfcStrippedOptional;
END_ENTITY;

EXPRESS-G diagram

`

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