IFC 4.3.0.1 (IFC4X3) development

7.10.3.2 IfcRelConnectsStructuralMember

7.10.3.2.1 Semantic definition

The entity IfcRelConnectsStructuralMember defines all needed properties describing the connection between structural members and structural connection objects (nodes or supports).

Use Definition

Point Connection Instances of the entity IfcRelConnectsStructuralMember shall be used to describe a connection between an instance of IfcStructuralPointConnection and either an instance of IfcStructuralCurveMember or IfcStructuralSurfaceMember. The RelatedStructuralConnection for point connections has to be of type IfcStructuralPointConnection.

Curve Connection Instances of the entity IfcRelConnectsStructuralMember shall be used to describe a connection between an instance of IfcStructuralCurveConnection and an instance of either IfcStructuralCurveMember or IfcStructuralSurfaceMember. The RelatedStructuralConnection for curve connections has to be of type IfcStructuralCurveConnection.

Surface Connection Instances of the entity IfcRelConnectsStructuralMember shall be used to describe a connection between an instance of IfcStructuralSurfaceConnection and an instance of IfcStructuralSurfaceMember. The RelatedStructuralConnection for curve connections has to be of type IfcStructuralSurfaceConnection.

Coordinate System for Applied Conditions All values defined by AppliedCondition or AdditionalConditions are given within the coordinate system provided by ConditionCoordinateSystem, which is defined relative to the local coordinate system of the structural member. If the ConditionCoordinateSystem is not defined, the local coordinate system of the structural member is used instead.

Supported Length Optionally a supported length can be given, which specifies the length (or width) of the physical connection along a curve connection.

Figure 7.10.3.2.A illustrates the appropriate definition of support lengths.

supported length
Figure 7.10.3.2.A — Structural member support lengths

7.10.3.2.2 Entity inheritance

7.10.3.2.3 Attributes

# Attribute Type Description
IfcRoot (4)
1 GlobalId IfcGloballyUniqueId

Assignment of a globally unique identifier within the entire software world.

2 OwnerHistory OPTIONAL IfcOwnerHistory

Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,

3 Name OPTIONAL IfcLabel

Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.

4 Description OPTIONAL IfcText

Optional description, provided for exchanging informative comments.

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IfcRelConnectsStructuralMember (6)
5 RelatingStructuralMember IfcStructuralMember

Reference to an instance of IfcStructuralMember (or its subclasses) which is connected to the specified structural connection.

6 RelatedStructuralConnection IfcStructuralConnection

Reference to an instance of IfcStructuralConnection (or its subclasses) which is connected to the specified structural member.

7 AppliedCondition OPTIONAL IfcBoundaryCondition

Conditions which define the connections properties. Connection conditions are often called "release" but are not only used to define mechanisms like hinges but also rigid, elastic, and other conditions.

8 AdditionalConditions OPTIONAL IfcStructuralConnectionCondition

Describes additional connection properties.

9 SupportedLength OPTIONAL IfcLengthMeasure

Defines the 'supported length' of this structural connection. See Fig. for more detail.

10 ConditionCoordinateSystem OPTIONAL IfcAxis2Placement3D

Defines a coordinate system used for the description of the connection properties in ConnectionCondition relative to the local coordinate system of RelatingStructuralMember. If left unspecified, the placement IfcAxis2Placement3D((x,y,z), ?, ?) is implied with x,y,z being the local member coordinates where the connection is made and the default axes directions being in parallel with the local axes of RelatingStructuralMember.

Table 7.10.3.2.B

7.10.3.2.4 Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

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Table 7.10.3.2.C

7.10.3.2.5 Formal representation

ENTITY IfcRelConnectsStructuralMember
 SUPERTYPE OF (ONEOF
	(IfcRelConnectsWithEccentricity))
 SUBTYPE OF (IfcRelConnects);
	RelatingStructuralMember : IfcStructuralMember;
	RelatedStructuralConnection : IfcStructuralConnection;
	AppliedCondition : OPTIONAL IfcBoundaryCondition;
	AdditionalConditions : OPTIONAL IfcStructuralConnectionCondition;
	SupportedLength : OPTIONAL IfcLengthMeasure;
	ConditionCoordinateSystem : OPTIONAL IfcAxis2Placement3D;
END_ENTITY;

7.10.3.2.6 References

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