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.

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, NOTE Only the last modification is stored - either as addition, deletion or modification. IFC4-CHANGE The attribute has been changed to be OPTIONAL.
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.
Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
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.C

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.D

7.10.3.2.5 Examples

Figure 7.10.3.2.B

Structural Curve Member

7.10.3.2.6 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;