IfcBoundaryFaceCondition

Item	Change	Description
IFC2x3 to IFC4
IfcBoundaryFaceCondition
TranslationalStiffnessByAreaX	MODIFIED	Name changed from LinearStiffnessByAreaX to TranslationalStiffnessByAreaX. Type changed from IfcModulusOfSubgradeReactionMeasure to IfcModulusOfSubgradeReactionSelect.
TranslationalStiffnessByAreaY	MODIFIED	Name changed from LinearStiffnessByAreaY to TranslationalStiffnessByAreaY. Type changed from IfcModulusOfSubgradeReactionMeasure to IfcModulusOfSubgradeReactionSelect.
TranslationalStiffnessByAreaZ	MODIFIED	Name changed from LinearStiffnessByAreaZ to TranslationalStiffnessByAreaZ. Type changed from IfcModulusOfSubgradeReactionMeasure to IfcModulusOfSubgradeReactionSelect.

Semantic definitions at the entity

Entity definition

Describes linearly elastic support conditions or connection conditions.

Applicability:

Surface supports and connections.

HISTORY New entity in IFC2x2.
IFC 2x4 change: Attributes LinearStiffnessX/Y/Z renamed to TranslationalStiffnessX/Y/Z.

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 representing infinite stiffness is no longer valid and must not be used.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	C
2	TranslationalStiffnessByAreaX	IfcModulusOfSubgradeReactionSelect	[0:1]	Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.	X
3	TranslationalStiffnessByAreaY	IfcModulusOfSubgradeReactionSelect	[0:1]	Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.	X
4	TranslationalStiffnessByAreaZ	IfcModulusOfSubgradeReactionSelect	[0:1]	Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcBoundaryCondition
1	Name	IfcLabel	[0:1]	Optionally defines a name for this boundary condition.	X
IfcBoundaryFaceCondition
2	TranslationalStiffnessByAreaX	IfcModulusOfSubgradeReactionSelect	[0:1]	Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.	X
3	TranslationalStiffnessByAreaY	IfcModulusOfSubgradeReactionSelect	[0:1]	Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.	X
4	TranslationalStiffnessByAreaZ	IfcModulusOfSubgradeReactionSelect	[0:1]	Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.	X

Formal representations

XSD Specification

 <xs:element name="IfcBoundaryFaceCondition" type="ifc:IfcBoundaryFaceCondition" substitutionGroup="ifc:IfcBoundaryCondition" nillable="true"/>

 <xs:complexType name="IfcBoundaryFaceCondition">

  <xs:complexContent>

   <xs:extension base="ifc:IfcBoundaryCondition">

    <xs:sequence>

     <xs:element name="TranslationalStiffnessByAreaX" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcModulusOfSubgradeReactionSelect"/>

      </xs:complexType>

     </xs:element>

     <xs:element name="TranslationalStiffnessByAreaY" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcModulusOfSubgradeReactionSelect"/>

      </xs:complexType>

     </xs:element>

     <xs:element name="TranslationalStiffnessByAreaZ" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcModulusOfSubgradeReactionSelect"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcBoundaryFaceCondition

 SUBTYPE OF (IfcBoundaryCondition);

  TranslationalStiffnessByAreaX : OPTIONAL IfcModulusOfSubgradeReactionSelect;

  TranslationalStiffnessByAreaY : OPTIONAL IfcModulusOfSubgradeReactionSelect;

  TranslationalStiffnessByAreaZ : OPTIONAL IfcModulusOfSubgradeReactionSelect;

END_ENTITY;

 EXPRESS-G diagram

	Randbedingung an einer Fläche
	Boundary Face Condition
	Condition de face limite