IfcBoundaryEdgeCondition

Item	Change	Description
IFC2x3 to IFC4
IfcBoundaryEdgeCondition
TranslationalStiffnessByLengthX	MODIFIED	Name changed from LinearStiffnessByLengthX to TranslationalStiffnessByLengthX. Type changed from IfcModulusOfLinearSubgradeReactionMeasure to IfcModulusOfTranslationalSubgradeReactionSelect.
TranslationalStiffnessByLengthY	MODIFIED	Name changed from LinearStiffnessByLengthY to TranslationalStiffnessByLengthY. Type changed from IfcModulusOfLinearSubgradeReactionMeasure to IfcModulusOfTranslationalSubgradeReactionSelect.
TranslationalStiffnessByLengthZ	MODIFIED	Name changed from LinearStiffnessByLengthZ to TranslationalStiffnessByLengthZ. Type changed from IfcModulusOfLinearSubgradeReactionMeasure to IfcModulusOfTranslationalSubgradeReactionSelect.
RotationalStiffnessByLengthX	MODIFIED	Type changed from IfcModulusOfRotationalSubgradeReactionMeasure to IfcModulusOfRotationalSubgradeReactionSelect.
RotationalStiffnessByLengthY	MODIFIED	Type changed from IfcModulusOfRotationalSubgradeReactionMeasure to IfcModulusOfRotationalSubgradeReactionSelect.
RotationalStiffnessByLengthZ	MODIFIED	Type changed from IfcModulusOfRotationalSubgradeReactionMeasure to IfcModulusOfRotationalSubgradeReactionSelect.

Semantic definitions at the entity

Entity definition

Describes linearly elastic support conditions or connection conditions.

Applicability:

Curve 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 representing infinite stiffness is no longer valid and must not be used.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	TranslationalStiffnessByLengthX	IfcModulusOfTranslationalSubgradeReactionSelect	[0:1]	Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.	X
3	TranslationalStiffnessByLengthY	IfcModulusOfTranslationalSubgradeReactionSelect	[0:1]	Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.	X
4	TranslationalStiffnessByLengthZ	IfcModulusOfTranslationalSubgradeReactionSelect	[0:1]	Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.	X
5	RotationalStiffnessByLengthX	IfcModulusOfRotationalSubgradeReactionSelect	[0:1]	Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.	X
6	RotationalStiffnessByLengthY	IfcModulusOfRotationalSubgradeReactionSelect	[0:1]	Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.	X
7	RotationalStiffnessByLengthZ	IfcModulusOfRotationalSubgradeReactionSelect	[0:1]	Rotational stiffness value about the z-axis 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
IfcBoundaryEdgeCondition
2	TranslationalStiffnessByLengthX	IfcModulusOfTranslationalSubgradeReactionSelect	[0:1]	Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.	X
3	TranslationalStiffnessByLengthY	IfcModulusOfTranslationalSubgradeReactionSelect	[0:1]	Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.	X
4	TranslationalStiffnessByLengthZ	IfcModulusOfTranslationalSubgradeReactionSelect	[0:1]	Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.	X
5	RotationalStiffnessByLengthX	IfcModulusOfRotationalSubgradeReactionSelect	[0:1]	Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.	X
6	RotationalStiffnessByLengthY	IfcModulusOfRotationalSubgradeReactionSelect	[0:1]	Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.	X
7	RotationalStiffnessByLengthZ	IfcModulusOfRotationalSubgradeReactionSelect	[0:1]	Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object.	X

Formal representations

XSD Specification

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

 <xs:complexType name="IfcBoundaryEdgeCondition">

  <xs:complexContent>

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

    <xs:sequence>

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

      <xs:complexType>

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

      </xs:complexType>

     </xs:element>

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

      <xs:complexType>

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

      </xs:complexType>

     </xs:element>

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

      <xs:complexType>

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

      </xs:complexType>

     </xs:element>

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

      <xs:complexType>

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

      </xs:complexType>

     </xs:element>

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

      <xs:complexType>

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

      </xs:complexType>

     </xs:element>

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

      <xs:complexType>

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

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcBoundaryEdgeCondition

 SUBTYPE OF (IfcBoundaryCondition);

  TranslationalStiffnessByLengthX : OPTIONAL IfcModulusOfTranslationalSubgradeReactionSelect;

  TranslationalStiffnessByLengthY : OPTIONAL IfcModulusOfTranslationalSubgradeReactionSelect;

  TranslationalStiffnessByLengthZ : OPTIONAL IfcModulusOfTranslationalSubgradeReactionSelect;

  RotationalStiffnessByLengthX : OPTIONAL IfcModulusOfRotationalSubgradeReactionSelect;

  RotationalStiffnessByLengthY : OPTIONAL IfcModulusOfRotationalSubgradeReactionSelect;

  RotationalStiffnessByLengthZ : OPTIONAL IfcModulusOfRotationalSubgradeReactionSelect;

END_ENTITY;

 EXPRESS-G diagram

	Randbedingung an einer Kante
	Boundary Edge Condition
	Condition d'arête limite