IfcBoundaryNodeConditionWarping

BACnet MVD

#### IfcBoundaryNodeConditionWarping

Natural language names

| Randbedingung an einem Knoten mit Wölbung
| Boundary Node Condition Warping

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcBoundaryNodeConditionWarping |  |  |  |
TranslationalStiffnessX |  |  | MODIFIED | Name changed from LinearStiffnessX to TranslationalStiffnessX. Type changed from IfcLinearStiffnessMeasure to IfcTranslationalStiffnessSelect.
TranslationalStiffnessY |  |  | MODIFIED | Name changed from LinearStiffnessY to TranslationalStiffnessY. Type changed from IfcLinearStiffnessMeasure to IfcTranslationalStiffnessSelect.
TranslationalStiffnessZ |  |  | MODIFIED | Name changed from LinearStiffnessZ to TranslationalStiffnessZ. Type changed from IfcLinearStiffnessMeasure to IfcTranslationalStiffnessSelect.
RotationalStiffnessX |  |  | MODIFIED | Type changed from IfcRotationalStiffnessMeasure to IfcRotationalStiffnessSelect.
RotationalStiffnessY |  |  | MODIFIED | Type changed from IfcRotationalStiffnessMeasure to IfcRotationalStiffnessSelect.
RotationalStiffnessZ |  |  | MODIFIED | Type changed from IfcRotationalStiffnessMeasure to IfcRotationalStiffnessSelect.
WarpingStiffness |  |  | MODIFIED | Type changed from IfcWarpingMomentMeasure to IfcWarpingStiffnessSelect.

##### Semantic definitions at the entity

Entity definition

Describes linearly elastic support conditions or connection conditions, including linearly elastic warping restraints.

Applicability:

- Point supports and connections.

> HISTORY New entity in IFC2x2.

> IFC4 CHANGE All attribute data types changed from numeric to SELECT between Boolean and numeric. Stiffnesses may now also be negative, for example to capture destabilizing effects in boundary conditions. The IFC2x3 convention of -1. representing infinite stiffness is no longer valid and must not be used. Infinite stiffness, i.e. fixed supports, are now modeled by the Boolean value TRUE.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
8 | WarpingStiffness | IfcWarpingStiffnessSelect | ? | Defines the warping stiffness value. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcBoundaryCondition
1 | Name | IfcLabel | ? | Optionally defines a name for this boundary condition. |  | X
IfcBoundaryNodeCondition
2 | TranslationalStiffnessX | IfcTranslationalStiffnessSelect | ? | Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object. |  | X
3 | TranslationalStiffnessY | IfcTranslationalStiffnessSelect | ? | Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object. |  | X
4 | TranslationalStiffnessZ | IfcTranslationalStiffnessSelect | ? | Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object. |  | X
5 | RotationalStiffnessX | IfcRotationalStiffnessSelect | ? | Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object. |  | X
6 | RotationalStiffnessY | IfcRotationalStiffnessSelect | ? | Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object. |  | X
7 | RotationalStiffnessZ | IfcRotationalStiffnessSelect | ? | Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object. |  | X
IfcBoundaryNodeConditionWarping
8 | WarpingStiffness | IfcWarpingStiffnessSelect | ? | Defines the warping stiffness value. |  | X

##### Formal representations

XML Specification
`<xs:element name="IfcBoundaryNodeConditionWarping" type="ifc:IfcBoundaryNodeConditionWarping" substitutionGroup="ifc:IfcBoundaryNodeCondition" nillable="true"/>
<xs:complexType name="IfcBoundaryNodeConditionWarping">
<xs:complexContent>
<xs:extension base="ifc:IfcBoundaryNodeCondition">
<xs:sequence>
<xs:element name="WarpingStiffness" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcWarpingStiffnessSelect"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcBoundaryNodeConditionWarping
SUBTYPE OF (IfcBoundaryNodeCondition);
WarpingStiffness : OPTIONAL IfcWarpingStiffnessSelect;
END_ENTITY;

EXPRESS-G diagram

`

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