 | Stab / Stabträger |
 | Member |
 | Membre |
| Item | SPF | XML | Change | Description | 4.0.0.0 |
|---|---|---|---|---|
| IfcMember | ||||
| OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. | ||
| PredefinedType | ADDED |
An IfcMember is a structural member designed to carry loads between or beyond points of support. It is not required to be load bearing. The orientation of the member (being horizontal, vertical or sloped) is not relevant to its definition (in contrary to IfcBeam and IfcColumn). An IfcMember represents a linear structural element from an architectural or structural modeling point of view and shall be used if it cannot be expressed more specifically as either an IfcBeam or an IfcColumn.
NOTE The representation of a member in a structural analysis model is provided by IfcStructuralCurveMember being part of an IfcStructuralAnalysisModel.
There are two main representations for member occurrences:
NOTE The entity IfcMemberStandardCase has been deprecated, IfcMember with IfcMaterialProfileSetUsage is used instead.
HISTORY New entity in IFC2x2 Addendum 1.
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 9 | PredefinedType | IfcMemberTypeEnum | ? |
Predefined generic type for a member that is specified in an enumeration. There may be a property set given for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcMemberType is assigned, providing its own IfcMemberType.PredefinedType. IFC4 CHANGE The attribute has been added at the end of the entity definition. | X |
| Rule | Description |
|---|---|
| CorrectPredefinedType | Either the PredefinedType attribute is unset (e.g. because an IfcMemberType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
| CorrectTypeAssigned | Either there is no member type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcMemberType. |
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| IfcRoot | |||||
| 1 | GlobalId | IfcGloballyUniqueId | Assignment of a globally unique identifier within the entire software world. | 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 |
| 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 |
| 4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. | X |
| IfcObjectDefinition | |||||
| HasAssignments | IfcRelAssigns @RelatedObjects | S[0:?] | Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups. | X | |
| Nests | IfcRelNests @RelatedObjects | S[0:1] | References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition. | X | |
| IsNestedBy | IfcRelNests @RelatingObject | S[0:?] | References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).
IFC4 CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition. | X | |
| HasContext | IfcRelDeclares @RelatedDefinitions | S[0:1] | References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.
IFC4 CHANGE The inverse attribute datatype has been added. | X | |
| IsDecomposedBy | IfcRelAggregates @RelatingObject | S[0:?] | References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).
IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates. | X | |
| Decomposes | IfcRelAggregates @RelatedObjects | S[0:1] | References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates. | X | |
| HasAssociations | IfcRelAssociates @RelatedObjects | S[0:?] | Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification. | X | |
| IfcObject | |||||
| 5 | ObjectType | IfcLabel | ? |
The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.
| X |
| IsDeclaredBy | IfcRelDefinesByObject @RelatedObjects | S[0:1] | Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange. | X | |
| Declares | IfcRelDefinesByObject @RelatingObject | S[0:?] | Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange. | X | |
| IsTypedBy | IfcRelDefinesByType @RelatedObjects | S[0:1] | Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.
IFC4 CHANGE New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange. | X | |
| IsDefinedBy | IfcRelDefinesByProperties @RelatedObjects | S[0:?] | Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.
IFC4 CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange. | X | |
| IfcProduct | |||||
| 6 | ObjectPlacement | IfcObjectPlacement | ? | Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system. | X |
| 7 | Representation | IfcProductRepresentation | ? | Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement. | X |
| ReferencedBy | IfcRelAssignsToProduct @RelatingProduct | S[0:?] | Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product. | X | |
| IfcElement | |||||
| 8 | Tag | IfcIdentifier | ? | The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level. | X |
| FillsVoids | IfcRelFillsElement @RelatedBuildingElement | S[0:1] | Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element. | X | |
| ConnectedTo | IfcRelConnectsElements @RelatingElement | S[0:?] | Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to. | X | |
| IsInterferedByElements | IfcRelInterferesElements @RelatedElement | S[0:?] | Reference to the interference relationship to indicate the element that is interfered. The relationship, if provided, indicates that this element has an interference with one or many other elements.
NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements. IFC4 CHANGE New inverse relationship. | X | |
| InterferesElements | IfcRelInterferesElements @RelatingElement | S[0:?] | Reference to the interference relationship to indicate the element that interferes. The relationship, if provided, indicates that this element has an interference with one or many other elements.
NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements. IFC4 CHANGE New inverse relationship. | X | |
| HasProjections | IfcRelProjectsElement @RelatingElement | S[0:?] | Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement. | X | |
| ReferencedInStructures | IfcRelReferencedInSpatialStructure @RelatedElements | S[0:?] | Reference relationship to the spatial structure element, to which the element is additionally associated. This relationship may not be hierarchical, an element may be referenced by zero, one or many spatial structure elements.
IFC2x3 CHANGE The inverse attribute has been added with upward compatibility for file based exchange. | X | |
| HasOpenings | IfcRelVoidsElement @RelatingBuildingElement | S[0:?] | Reference to the IfcRelVoidsElement relationship that creates an opening in an element. An element can incorporate zero-to-many openings. For each opening, that voids the element, a new relationship IfcRelVoidsElement is generated. | X | |
| IsConnectionRealization | IfcRelConnectsWithRealizingElements @RealizingElements | S[0:?] | Reference to the connection relationship with realizing element. The relationship, if provided, assigns this element as the realizing element to the connection, which provides the physical manifestation of the connection relationship. | X | |
| ProvidesBoundaries | IfcRelSpaceBoundary @RelatedBuildingElement | S[0:?] | Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces. | X | |
| ConnectedFrom | IfcRelConnectsElements @RelatedElement | S[0:?] | Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element. | X | |
| ContainedInStructure | IfcRelContainedInSpatialStructure @RelatedElements | S[0:1] | Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierachical, i.e. an element may only be assigned directly to zero or one spatial structure. | X | |
| HasCoverings | IfcRelCoversBldgElements @RelatingBuildingElement | S[0:?] | Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElement. It defines the concept of an element having coverings associated. | X | |
| IfcBuildingElement | |||||
| IfcMember | |||||
| 9 | PredefinedType | IfcMemberTypeEnum | ? |
Predefined generic type for a member that is specified in an enumeration. There may be a property set given for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcMemberType is assigned, providing its own IfcMemberType.PredefinedType. IFC4 CHANGE The attribute has been added at the end of the entity definition. | X |
Object Typing
The Object Typing concept template applies to this entity as shown in Table 122.
| ||||
Table 122 — IfcMember Object Typing |
Property Sets for Objects
The Property Sets for Objects concept template applies to this entity as shown in Table 123.
Quantity Sets
The Quantity Sets concept template applies to this entity as shown in Table 124.
| ||||
Table 124 — IfcMember Quantity Sets |
Material Profile Set
The Material Profile Set concept applies to this entity.
The material information of the IfcMember is defined by the IfcMaterialProfileSet or as fallback by IfcMaterial, and it is attached either directly or at the IfcMemberType. In this case, the material information does not allow to construct a shape by applying the profile definition to the axis representation, to enable this parametric definition, the IfcMaterialProfileSetUsage has to be used instead.
Material Profile Set Usage
The Material Profile Set Usage concept applies to this entity.
The material of the IfcMember is defined by IfcMaterialProfileSetUsage and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship. Composite profile members can be represented by refering to several IfcMaterialProfile's within the IfcMaterialProfileSet that is referenced from the IfcMaterialProfileSetUsage.
Figure 233 illustrates assignment of IfcMaterialProfileSetUsage and IfcMaterialProfileSet to the IfcMember as the member occurrence and to the IfcMemberType. The same IfcMaterialProfileSet shall be shared by many occurrences of IfcMaterialProfileSetUsage. This relationship shall be consistent to the relationship between the IfcMemberType and the IfcMember.
 |
Figure 233 — Member profile usage |
Figure 234 illustrates assignment of a composite profile by using IfcCompositeProfile for geometric representation and several IfcMaterialProfile's within the IfcMaterialProfileSet. The number of IfcMaterialProfile's within the IfcMaterialProfileSet is restricted to maximal 2 and requires the use of IfcExtrudedAreaSolidTapered, or IfcRevolvedAreaSolidTapered for the correct 'Body' shape representation.
 |
Figure 234 — Member composite profiles |
Spatial Containment
The Spatial Containment concept template applies to this entity as shown in Table 125.
| ||||||||
Table 125 — IfcMember Spatial Containment |
The IfcMember, as any subtype of IfcBuildingElement, may participate alternatively in one of the two different containment relationships:
Axis 3D Geometry
The Axis 3D Geometry concept template applies to this entity as shown in Table 126.
| ||||||||
Table 126 — IfcMember Axis 3D Geometry |
The axis representation can be used to represent the system length of a member that may extent the body length of the member.
NOTE The 'Axis' is used to locate the material profile set, if the material association is of type IfcMaterialProfileSetUsage.
The following additional constraints apply to the 'Axis' representation, if an IfcMaterialProfileSetUsage is provided and the 'Body' shape representation has the RepresentationType: 'SweptSolid':
 |
EXAMPLE As shown in Figure 101, the axis representation can be used to represent the system length of a member that may extent the body length of the member. |
Figure 235 — Member axis representation |
 |
EXAMPLE As shown in Figure 102, the axis representation shall be used to represent the cardinal point as the offset between the 'Axis' and the extrusion path of the member. The extrusion path is provided as IfcExtrudedAreaSolid.ExtrudedDirection and should be parallel to the 'Axis'. It has to be guaranteed that the value provided by IfcMaterialProfileSetUsage.CardinalPoint is consistent to the IfcExtrudedAreaSolid.Position. |
Figure 236 — Member axis cardinal point |
Body SweptSolid Geometry
The Body SweptSolid Geometry concept applies to this entity.
The following constraints apply to the 'SweptSolid' representation:
Figure 236 illustrates a 'SweptSolid' geometric representation with cardinal point applied as 1 (bottom left).
The following interpretation of dimension parameter applies for rectangular members:
The following interpretation of dimension parameter applies for circular members:
 |
Figure 236 — Member body extrusion |
Body AdvancedSweptSolid Geometry
The Body AdvancedSweptSolid Geometry concept applies to this entity.
The following constraints apply to the 'AdvancedSweptSolid' representation type:
NOTE View definitions and implementer agreements can further constrain the allowed swept solid types.
The following additional constraints apply to the 'AdvancedSweptSolid' representation type, when an IfcMaterialProfileSetUsage is assigned to the IfcMember:
NOTE View definitions and implementer agreement can further constrain the allowed swept solid types.
NOTE Using IfcExtrudedAreaSolidTapered, or IfcRevolvedAreaSolidTapered requires the use of two IfcMaterialProfile's within the IfcMaterialProfileSet assinged to the IfcBeamStandardCase
Body Clipping Geometry
The Body Clipping Geometry concept applies to this entity.
The following constraints apply to the 'Clipping' representation:
Figure 238 illustrates a 'Clipping' geometric representation with use of IfcBooleanClippingResult between an IfcExtrudedAreaSolid and an IfcHalfSpaceSolid to create a clipped body.
 |
Figure 238 — Member clipping |
The following constraints apply to the 'Clipping' representation, when an IfcMaterialProfileSetUsage is assigned to the IfcMember:
Figure 239 illustrates an advanced geometric representation with use of IfcBooleanClippingResult between an IfcExtrudedAreaSolid and an IfcHalfSpaceSolid to create a clipped body, with cardinal point applied as 4 (mid-depth left).
 |
Figure 239 — Member body clipping |
Instance diagram
<?xml version="1.0"?>
<ConceptRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" uuid="500c2037-0227-43f4-bc7d-772e6696f071" name="IfcMember" status="sample" applicableRootEntity="IfcMember">
<Concepts>
<Concept uuid="c35fa282-d744-4b68-b473-8b35c21a9887" name="Object Typing" status="sample" override="false">
<Template ref="35a2e10e-20df-40f4-ab2f-dacf0a6744f4" />
<TemplateRules operator="and">
<TemplateRule Parameters="RelatingType[Type]='IfcMemberType'" />
</TemplateRules>
</Concept>
<Concept uuid="8d316b23-2ce3-4e83-a4cb-dd5e9bf09fda" name="Property Sets for Objects" status="sample" override="false">
<Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
<TemplateRules operator="and">
<TemplateRule Parameters="PsetName[Value]='Pset_MemberCommon'" />
<TemplateRule Parameters="PsetName[Value]='Pset_ConcreteElementGeneral'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementFabrication'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementGeneral'" />
</TemplateRules>
</Concept>
<Concept uuid="5c53d452-6aae-46bc-bb6c-6ae6afcb918d" name="Quantity Sets" status="sample" override="false">
<Template ref="6652398e-6579-4460-8cb4-26295acfacc7" />
<TemplateRules operator="and">
<TemplateRule Parameters="QsetName[Value]='Qto_MemberBaseQuantities'" />
</TemplateRules>
</Concept>
<Concept uuid="03da06cd-85ae-4e69-946d-ae77fdd5d96e" name="Material Profile Set" status="sample" override="false">
<Template ref="427ac055-2a71-42c2-a423-71689fa75c59" />
</Concept>
<Concept uuid="3aa1b8db-5b42-4cd1-89ef-d7b63dc15be3" name="Material Profile Set Usage" status="sample" override="false">
<Template ref="6aa01429-b566-4b36-875a-3162088a9831" />
</Concept>
<Concept uuid="6bf0dd75-0775-476f-8f9d-acea24358ad8" name="Spatial Containment" status="sample" override="false">
<Template ref="d9a3f822-0014-4bc2-8d94-9d9067759045" />
<TemplateRules operator="and">
<TemplateRule Description="Default spatial container" Parameters="RelatingStructure[Type]='IfcBuildingStorey'" />
<TemplateRule Description="Spatial container for the element if it cannot be assigned to a building storey" Parameters="RelatingStructure[Type]='IfcBuilding'" />
<TemplateRule Description="Spatial container for the element in case that it is placed on site (outside of building)" Parameters="RelatingStructure[Type]='IfcSite'" />
</TemplateRules>
</Concept>
<Concept uuid="018b9972-d03a-4c42-9791-c1de735e408e" name="Axis 3D Geometry" status="sample" override="false">
<Template ref="b894d8cb-fb41-45ec-ba18-72cac6baff34" />
<TemplateRules operator="and">
<TemplateRule Description="Three-dimensional reference curve for the member." Parameters="Identifier[Value]='Axis' AND Type[Value]='Curve3D' AND Items[Type]='IfcBoundedCurve'" />
</TemplateRules>
</Concept>
<Concept uuid="3972b9bf-f315-47b6-bb97-7f71374fdcca" name="Body SweptSolid Geometry" status="sample" override="false">
<Template ref="cb7c18fa-cf83-4db1-be1b-c013ba4ed672" />
</Concept>
<Concept uuid="cb70286f-77ba-4d7e-9587-bfe72edfa4ae" name="Body AdvancedSweptSolid Geometry" status="sample" override="false">
<Template ref="5464785d-e5d1-4f75-9ecc-6cb39214705e" />
</Concept>
<Concept uuid="1ea06ddb-bf9b-4644-bd58-f730cf2a4008" name="Body Clipping Geometry" status="sample" override="false">
<Template ref="2cdbc2f5-9b0c-43ea-9d2a-9d72d0147e00" />
</Concept>
</Concepts>
</ConceptRoot>
| # | Concept | Template | Model View |
|---|---|---|---|
| IfcRoot | |||
| Identity | Software Identity | General Usage | |
| Revision Control | Revision Control | General Usage | |
| IfcObjectDefinition | |||
| Classification Association | Classification | General Usage | |
| IfcObject | |||
| Object User Identity | Object User Identity | General Usage | |
| Object Predefined Type | Object Predefined Type | General Usage | |
| Property Sets with Override | Property Sets with Override | General Usage | |
| IfcProduct | |||
| Product Placement | Product Placement | General Usage | |
| Product Geometric Representation | Product Geometric Representation | General Usage | |
| IfcElement | |||
| Product Local Placement | Product Local Placement | General Usage | |
| CoG Geometry | CoG Geometry | General Usage | |
| Box Geometry | Box Geometry | General Usage | |
| FootPrint Geometry | FootPrint Geometry | General Usage | |
| Body SurfaceOrSolidModel Geometry | Body SurfaceOrSolidModel Geometry | General Usage | |
| Body SurfaceModel Geometry | Body SurfaceModel Geometry | General Usage | |
| Body Tessellation Geometry | Body Tessellation Geometry | General Usage | |
| Body Brep Geometry | Body Brep Geometry | General Usage | |
| Body AdvancedBrep Geometry | Body AdvancedBrep Geometry | General Usage | |
| Body CSG Geometry | Body CSG Geometry | General Usage | |
| Mapped Geometry | Mapped Geometry | General Usage | |
| Element Voiding | Element Voiding | General Usage | |
| Element Projecting | Element Projecting | General Usage | |
| IfcBuildingElement | |||
| Product Assignment | Product Assignment | General Usage | |
| Surface 3D Geometry | Surface 3D Geometry | General Usage | |
| IfcMember | |||
| Object Typing | Object Typing | General Usage | |
| Property Sets for Objects | Property Sets for Objects | General Usage | |
| Quantity Sets | Quantity Sets | General Usage | |
| Material Profile Set | Material Profile Set | General Usage | |
| Material Profile Set Usage | Material Profile Set Usage | General Usage | |
| Spatial Containment | Spatial Containment | General Usage | |
| Axis 3D Geometry | Axis 3D Geometry | General Usage | |
| Body SweptSolid Geometry | Body SweptSolid Geometry | General Usage | |
| Body AdvancedSweptSolid Geometry | Body AdvancedSweptSolid Geometry | General Usage | |
| Body Clipping Geometry | Body Clipping Geometry | General Usage | |
<xs:element name="IfcMember" type="ifc:IfcMember" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
<xs:complexType name="IfcMember">
<xs:complexContent>
<xs:extension base="ifc:IfcBuildingElement">
<xs:attribute name="PredefinedType" type="ifc:IfcMemberTypeEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcMember
SUPERTYPE OF(IfcMemberStandardCase)
SUBTYPE OF (IfcBuildingElement);
PredefinedType : OPTIONAL IfcMemberTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcMemberTypeEnum.USERDEFINED) OR
((PredefinedType = IfcMemberTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
('IFCSHAREDBLDGELEMENTS.IfcMemberType' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;
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