![]() | Wand |
![]() | Wall |
![]() | Mur |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcWall | ||||
OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. | ||
PredefinedType | ADDED | IFC4x1 to IFC4x2 | ||
IfcWall | ||||
PositionedFrom | ADDED |
The wall represents a vertical construction that bounds or subdivides spaces. Wall are usually vertical, or nearly vertical, planar elements, often designed to bear structural loads. A wall is however not required to be load bearing.
NOTE Definition according to ISO 6707-1: vertical construction usually in masonry or in concrete which bounds or subdivides a construction works and fulfils a load bearing or retaining function.
NOTE There is a representation of walls for structural analysis provided by a proper subtype of IfcStructuralMember being part of the IfcStructuralAnalysisModel.
NOTE An arbitrary planar element to which this semantic information is not applicable (is not predominantly vertical), shall be modeled as IfcPlate.
A wall may have openings, such as wall openings, openings used for windows or doors, or niches and recesses. They are defined by an IfcOpeningElement attached to the wall using the inverse relationship HasOpenings pointing to IfcRelVoidsElement.
NOTE Walls with openings that have already been modeled within the enclosing geometry may use the relationship IfcRelConnectsElements to associate the wall with embedded elements such as doors and windows.
There are three entities for wall occurrences:
HISTORY New entity in IFC1.0
# | Attribute | Type | Cardinality | Description | B |
---|---|---|---|---|---|
9 | PredefinedType | IfcWallTypeEnum | [0:1] |
Predefined generic type for a wall that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcWallType is assigned, providing its own IfcWallType.PredefinedType. | X |
Rule | Description |
---|---|
CorrectPredefinedType | Either the PredefinedType attribute is unset (e.g. because an IfcWallType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
CorrectTypeAssigned | Either there is no wall type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcWallType. |
# | Attribute | Type | Cardinality | Description | B |
---|---|---|---|---|---|
IfcRoot | |||||
1 | GlobalId | IfcGloballyUniqueId | [1:1] | Assignment of a globally unique identifier within the entire software world. | X |
2 | OwnerHistory | IfcOwnerHistory | [0:1] |
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. | X |
3 | Name | IfcLabel | [0:1] | 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 | [0:1] | 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). | ||
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). | 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. | ||
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). | 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). | 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 | - | This attribute is out of scope for this model view definition and shall not be set. | ||
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. | 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. | X | |
IfcProduct | |||||
6 | ObjectPlacement | IfcObjectPlacement | [0:1] | 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 | [0:1] | 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 | [0:1] | 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 |
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. | ||
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 | |
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. | ||
PositionedFrom | IfcRelPositions @RelatingElement | S[0:1] | Indicates a constrained placement, where the ObjectPosition must match positioning defined according to the referenced positioning element. | X | |
IfcBuildingElement | |||||
IfcWall | |||||
9 | PredefinedType | IfcWallTypeEnum | [0:1] |
Predefined generic type for a wall that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcWallType is assigned, providing its own IfcWallType.PredefinedType. | X |
This entity is used for walls of abutments, including wingwalls and foundation walls.
Geometry is commonly descibed using extruded solids or tapered extruded solids. For circular geometry, revolved solids or tapered revolved solids may be used. For more advanced scenarios having spiral geometry, surface curve swept solids (for constant profile) or sectioned spines (for variable profiles) may be used.
Walls may aggregate rebar and rebar meshes for rebar, with exception of any reinforcing that starts at footings. (Any rebar extending from a footing into a wall is defined where it is placed, which would be within the footing.)
Walls may have voids provisioned for embedded items such as junction boxes and conduit.
Walls are typically connected to footings using an element connectivity relationship, where surface geometry may constrain the connection.
Object Typing
The Object Typing concept applies to this entity as shown in Table 55.
| ||
Table 55 — IfcWall Object Typing |
Exchange | ![]() |
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Import | O | |||
Export | O |
Quantity Sets
The Quantity Sets concept applies to this entity as shown in Table 56.
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Table 56 — IfcWall Quantity Sets |
Exchange | ![]() |
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Import | O | |||
Export | O |
Element Decomposition
The Element Decomposition concept applies to this entity as shown in Table 57.
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Table 57 — IfcWall Element Decomposition |
Exchange | ![]() |
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Import | R | |||
Export | R |
Surface Connectivity
The Surface Connectivity concept applies to this entity as shown in Table 58.
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Table 58 — IfcWall Surface Connectivity |
Exchange | ![]() |
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Import | O | |||
Export | O |
Element Voiding
The Element Voiding concept applies to this entity as shown in Table 59.
Table 59 — IfcWall Element Voiding |
Material Layer Set
The Material Layer Set concept applies to this entity.
The material of the IfcWall is defined by IfcMaterialLayerSet, or as fallback by IfcMaterial, and it is attached either directly or at the IfcWallType.
NOTE It is illegal to assign an IfcMaterialLayerSetUsage to an IfcWall. Only the subtype IfcWallStandardCase supports this concept.
Axis 2D Geometry
The Axis 2D Geometry concept applies to this entity as shown in Table 60.
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Table 60 — IfcWall Axis 2D Geometry |
NOTE The 'Axis' is not used to locate the material layer set, only the subtype IfcWallStandardCase provides this capability.
Exchange | ![]() |
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Import | ||||
Export |
Body SweptSolid Geometry
The Body SweptSolid Geometry concept applies to this entity.
Body AdvancedSwept Tapered Geometry
The Body AdvancedSwept Tapered Geometry concept applies to this entity.
Body AdvancedSwept Directrix Geometry
The Body AdvancedSwept Directrix Geometry concept applies to this entity.
Body Clipping Geometry
The Body Clipping Geometry concept applies to this entity.
Path Connectivity
The Path Connectivity concept applies to this entity as shown in Table 61.
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Table 61 — IfcWall Path Connectivity |
Exchange | ![]() |
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Import | ||||
Export |
Element Voiding
The Element Voiding concept applies to this entity as shown in Table 62.
Table 62 — IfcWall Element Voiding |
Exchange | ![]() |
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Import | ||||
Export |
# | Concept | Model View |
---|---|---|
IfcRoot | ||
Software Identity | Bridge View | |
User Identity | Bridge View | |
Object Ownership | Bridge View | |
IfcObject | ||
Property Sets for Objects | Bridge View | |
IfcElement | ||
Element Occurrence Attributes | Bridge View | |
Product Local Placement | Bridge View | |
Product Assignment | Bridge View | |
IfcWall | ||
Object Typing | Bridge View | |
Quantity Sets | Bridge View | |
Element Decomposition | Bridge View | |
Surface Connectivity | Bridge View | |
Element Voiding | Bridge View | |
Material Layer Set | Bridge View | |
Axis 2D Geometry | Bridge View | |
Body SweptSolid Geometry | Bridge View | |
Body AdvancedSwept Tapered Geometry | Bridge View | |
Body AdvancedSwept Directrix Geometry | Bridge View | |
Body Clipping Geometry | Bridge View | |
Path Connectivity | Bridge View |
<xs:element name="IfcWall" type="ifc:IfcWall" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
<xs:complexType name="IfcWall">
<xs:complexContent>
<xs:extension base="ifc:IfcBuildingElement">
<xs:attribute name="PredefinedType" type="ifc:IfcWallTypeEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcWall
SUBTYPE OF (IfcBuildingElement);
PredefinedType : OPTIONAL IfcWallTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcWallTypeEnum.USERDEFINED) OR
((PredefinedType = IfcWallTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
('IFCSHAREDBLDGELEMENTS.IFCWALLTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;