IfcRelConnectsStructuralMember

BACnet MVD

#### IfcRelConnectsStructuralMember

Natural language names

| Verbindet idealisierte Tragelemente - Relation
| Rel Connects Structural Member

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcRelConnectsStructuralMember |  |  |  |
OwnerHistory |  |  | MODIFIED | Instantiation changed to OPTIONAL.

##### Semantic definitions at the entity

Entity definition

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

> HISTORY New entity in IFC2x2.

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 264 illustrates the appropriate definition of support lengths.

Figure 264 — Structural member support lengths

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
5 | RelatingStructuralMember | IfcStructuralMember |  | Reference to an instance of IfcStructuralMember (or its subclasses) which is connected to the specified structural connection. |  | X
6 | RelatedStructuralConnection | IfcStructuralConnection |  | Reference to an instance of IfcStructuralConnection (or its subclasses) which is connected to the specified structural member. |  | X
7 | AppliedCondition | 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. |  | X
8 | AdditionalConditions | IfcStructuralConnectionCondition | ? | Describes additional connection properties. |  | X
9 | SupportedLength | IfcLengthMeasure | ? | Defines the 'supported length' of this structural connection. See Fig. for more detail. |  | X
10 | ConditionCoordinateSystem | 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. |  | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

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 in stored - either as addition, deletion or modification.

> IFC4 CHANGE The attribute has been changed to be OPTIONAL.

X

X

3 | Name | 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. | X | X
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. |  | X
IfcRelationship
IfcRelConnects
IfcRelConnectsStructuralMember
5 | RelatingStructuralMember | IfcStructuralMember |  | Reference to an instance of IfcStructuralMember (or its subclasses) which is connected to the specified structural connection. |  | X
6 | RelatedStructuralConnection | IfcStructuralConnection |  | Reference to an instance of IfcStructuralConnection (or its subclasses) which is connected to the specified structural member. |  | X
7 | AppliedCondition | 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. |  | X
8 | AdditionalConditions | IfcStructuralConnectionCondition | ? | Describes additional connection properties. |  | X
9 | SupportedLength | IfcLengthMeasure | ? | Defines the 'supported length' of this structural connection. See Fig. for more detail. |  | X
10 | ConditionCoordinateSystem | 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. |  | X

##### Definitions applying to Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Formal representations

XML Specification
`<xs:element name="IfcRelConnectsStructuralMember" type="ifc:IfcRelConnectsStructuralMember" substitutionGroup="ifc:IfcRelConnects" nillable="true"/>
<xs:complexType name="IfcRelConnectsStructuralMember">
<xs:complexContent>
<xs:extension base="ifc:IfcRelConnects">
<xs:sequence>
<xs:element name="RelatingStructuralMember" type="ifc:IfcStructuralMember" nillable="true"/>
<xs:element name="RelatedStructuralConnection" type="ifc:IfcStructuralConnection" nillable="true"/>
<xs:element name="AppliedCondition" type="ifc:IfcBoundaryCondition" nillable="true" minOccurs="0"/>
<xs:element name="AdditionalConditions" type="ifc:IfcStructuralConnectionCondition" nillable="true" minOccurs="0"/>
<xs:element name="ConditionCoordinateSystem" type="ifc:IfcAxis2Placement3D" nillable="true" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="SupportedLength" type="ifc:IfcLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcRelConnectsStructuralMember
SUPERTYPE OF(IfcRelConnectsWithEccentricity)
SUBTYPE OF (IfcRelConnects);
RelatingStructuralMember : IfcStructuralMember;
RelatedStructuralConnection : IfcStructuralConnection;
AppliedCondition : OPTIONAL IfcBoundaryCondition;
AdditionalConditions : OPTIONAL IfcStructuralConnectionCondition;
SupportedLength : OPTIONAL IfcLengthMeasure;
ConditionCoordinateSystem : OPTIONAL IfcAxis2Placement3D;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcStructuralConnection IfcStructuralMember

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