![]() | Stütze / Pfeiler |
![]() | Column |
![]() | Poteau |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
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IfcColumn | ||||
OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. | ||
PredefinedType | ADDED | IFC4x1 to IFC4x2 | ||
IfcColumn | ||||
PositionedFrom | ADDED |
NOTE Definition according to ISO 6707-1
structural member of slender form, usually vertical, that transmits to its base the forces, primarily in compression, that are applied to it.
NOTE The representation of a column in a structural analysis model is provided by IfcStructuralCurveMember being part of an IfcStructuralAnalysisModel.
NOTE For any longitudial structural member, not constrained to be predominately horizontal nor vertical, or where this semantic information is irrelevant, the entity IfcMember exists.
The IFC specification provides two entities for column occurrences:
NOTE View definitions and implementer agreements may further constrain the applicable geometry types, for example by excluding tapering from an IfcColumnStandardCase implementation.
HISTORY New entity in IFC1.0
# | Attribute | Type | Cardinality | Description | B |
---|---|---|---|---|---|
9 | PredefinedType | IfcColumnTypeEnum | [0:1] |
Predefined generic type for a column that is specified in an enumeration. There may be a property set given specificly for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcColumnType is assigned, providing its own IfcColumnType.PredefinedType. | X |
Rule | Description |
---|---|
CorrectPredefinedType | Either the PredefinedType attribute is unset (e.g. because an IfcColumnType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
CorrectTypeAssigned | Either there is no column type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcColumnType. |
# | 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 | |||||
IfcColumn | |||||
9 | PredefinedType | IfcColumnTypeEnum | [0:1] |
Predefined generic type for a column that is specified in an enumeration. There may be a property set given specificly for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcColumnType is assigned, providing its own IfcColumnType.PredefinedType. | X |
Columns are used to represent linear members with primary function of vertical axial loading such as the vertical portion of a pier. The general definition IfcColumn defines a fixed shape, while the subtype IfcColumnStandardCase allows for parametric resizing.
Geometry is commonly descibed using extruded solids or tapered extruded solids, extruded vertically for circular columns, or extruded horizontally as part of hammer head piers.
Columns may aggregate rebar and rebar meshes, with exception of any reinforcing that starts at footings. (Any rebar extending from a footing into a column is defined where it is placed, which would be within the footing.)
Columns 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 27.
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Table 27 — IfcColumn Object Typing |
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Import | O | |||
Export | O |
Quantity Sets
The Quantity Sets concept applies to this entity as shown in Table 28.
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Table 28 — IfcColumn Quantity Sets |
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Import | O | |||
Export | O |
Element Decomposition
The Element Decomposition concept applies to this entity as shown in Table 29.
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Table 29 — IfcColumn Element Decomposition |
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Import | ||||
Export |
Body SweptSolid Geometry
The Body SweptSolid Geometry concept applies to this entity.
The following additional constraints apply to the 'SweptSolid' representation:
Figure 174 illustrates a 'SweptSolid' geometric representation. There are no restrictions or conventions on how to use the local placement (black), solid of extrusion placement (red) and profile placement (green).
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Figure 174 — Column swept solid |
Figure 175 illustrates use of a special profile type (here IfcIShapeProfileDef) for the definition of the IfcExtrudedAreaSolid.
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Figure 175 — Column extrusion of I-Shape |
Annotation 2D Geometry
The Annotation 2D Geometry concept applies to this entity as shown in Table 30.
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Table 30 — IfcColumn Annotation 2D Geometry |
For fabrication, piece marks, pop marks, and contour marks may be designated using the 'Annotation' representation.
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Import | ||||
Export |
Surface Connectivity
The Surface Connectivity concept applies to this entity as shown in Table 31.
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Table 31 — IfcColumn Surface Connectivity |
This relationship is used to indicate connections between columns and other elements such as footings. The intersecting surface may be provided to indicate precisely where the column is attached, and in the case of steel, to assist fabrication for indicating contour marking and/or weld locations.
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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 | |
IfcColumn | ||
Object Typing | Bridge View | |
Quantity Sets | Bridge View | |
Element Decomposition | Bridge View | |
Body SweptSolid Geometry | Bridge View | |
Annotation 2D Geometry | Bridge View | |
Surface Connectivity | Bridge View |
<xs:element name="IfcColumn" type="ifc:IfcColumn" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
<xs:complexType name="IfcColumn">
<xs:complexContent>
<xs:extension base="ifc:IfcBuildingElement">
<xs:attribute name="PredefinedType" type="ifc:IfcColumnTypeEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcColumn
SUPERTYPE OF(IfcColumnStandardCase)
SUBTYPE OF (IfcBuildingElement);
PredefinedType : OPTIONAL IfcColumnTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcColumnTypeEnum.USERDEFINED) OR
((PredefinedType = IfcColumnTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
('IFCSHAREDBLDGELEMENTS.IFCCOLUMNTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;