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8.19.3.4 IfcBoundaryNodeCondition

8.19.3.4.1 Semantic definition

Describes linearly elastic support conditions or connection conditions.

Applicability:

  • Point 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 representing infinite stiffness is no longer valid and must not be used.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.

8.19.3.4.2 Entity inheritance

8.19.3.4.3 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
IfcBoundaryNodeCondition (6)
2 TranslationalStiffnessX OPTIONAL IfcTranslationalStiffnessSelect

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

3 TranslationalStiffnessY OPTIONAL IfcTranslationalStiffnessSelect

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

4 TranslationalStiffnessZ OPTIONAL IfcTranslationalStiffnessSelect

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

5 RotationalStiffnessX OPTIONAL IfcRotationalStiffnessSelect

Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object.

6 RotationalStiffnessY OPTIONAL IfcRotationalStiffnessSelect

Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object.

7 RotationalStiffnessZ OPTIONAL IfcRotationalStiffnessSelect

Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object.

Table 8.19.3.4.B

8.19.3.4.4 Examples

8.19.3.4.5 Formal representation

ENTITY IfcBoundaryNodeCondition
 SUPERTYPE OF (ONEOF
	(IfcBoundaryNodeConditionWarping))
 SUBTYPE OF (IfcBoundaryCondition);
	TranslationalStiffnessX : OPTIONAL IfcTranslationalStiffnessSelect;
	TranslationalStiffnessY : OPTIONAL IfcTranslationalStiffnessSelect;
	TranslationalStiffnessZ : OPTIONAL IfcTranslationalStiffnessSelect;
	RotationalStiffnessX : OPTIONAL IfcRotationalStiffnessSelect;
	RotationalStiffnessY : OPTIONAL IfcRotationalStiffnessSelect;
	RotationalStiffnessZ : OPTIONAL IfcRotationalStiffnessSelect;
END_ENTITY;

8.19.3.4.6 References

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8.19.3.4.7 Changelog

8.19.3.4.7.1 IFC4