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8.19.3.3 IfcBoundaryFaceCondition

8.19.3.3.1 Semantic definition

Describes linearly elastic support conditions or connection conditions.

Applicability:

  • Surface supports and connections.
New entity in IFC2x2. IFC 2x4 change: Attributes LinearStiffnessX/Y/Z renamed to TranslationalStiffnessX/Y/Z. 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 representing infinite stiffness is no longer valid and must not be used.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.

8.19.3.3.2 Entity inheritance

8.19.3.3.3 Attributes

# Attribute Type Description
IfcBoundaryCondition (1)
1 Name OPTIONAL IfcLabel

Optionally defines a name for this boundary condition.
Click to show 1 hidden inherited attributes Click to hide 1 inherited attributes
IfcBoundaryFaceCondition (3)
2 TranslationalStiffnessByAreaX OPTIONAL IfcModulusOfSubgradeReactionSelect

Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object.
3 TranslationalStiffnessByAreaY OPTIONAL IfcModulusOfSubgradeReactionSelect

Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object.
4 TranslationalStiffnessByAreaZ OPTIONAL IfcModulusOfSubgradeReactionSelect

Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object.
Table 8.19.3.3.A

8.19.3.3.4 Formal representation 

ENTITY IfcBoundaryFaceCondition
 SUBTYPE OF (IfcBoundaryCondition);
	TranslationalStiffnessByAreaX : OPTIONAL IfcModulusOfSubgradeReactionSelect;
	TranslationalStiffnessByAreaY : OPTIONAL IfcModulusOfSubgradeReactionSelect;
	TranslationalStiffnessByAreaZ : OPTIONAL IfcModulusOfSubgradeReactionSelect;
END_ENTITY;

8.19.3.3.5 References

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8.19.3.3.6 Changelog

8.19.3.3.6.1 IFC4