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The standard column, IfcColumnStandardCase, defines a column with certain constraints for the provision of material usage, parameters and with certain constraints for the geometric representation. The IfcColumnStandardCase handles all cases of columns, that:

HISTORY  New entity in IFC4.

Geometric Representations

The geometric representation of IfcColumnStandardCase is defined using the following multiple shape representations for its definition:

NOTE  It is invalid to exchange a 'SurfaceModel', 'Brep', or 'MappedRepresentation' representation for the 'Body' shape representation of an IfcColumnStandardCase.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Material Profile Set Usage

The Material Profile Set Usage concept applies to this entity.

The IfcColumnStandardCase defines in addition that the IfcColumnType should have a unique IfcMaterialProfileSet, that is referenced by the IfcMaterialProfileSetUsage assigned to all occurrences of this IfcColumnType. Composite profile columns can be represented by refering to several IfcMaterialProfile's within the IfcMaterialProfileSet that is referenced from the IfcMaterialProfileSetUsage.

Figure 174 illustrates assignment of IfcMaterialProfileSetUsage and IfcMaterialProfileSet to the IfcColumnStandardCase as the column occurrence and to the IfcColumnType. The same IfcMaterialProfileSet shall be shared by many occurrences of IfcMaterialProfileSetUsage. This relationship shall be consistent to the relationship between the IfcColumnType and the IfcColumnStandardCase.

Material profile set and usage

Figure 174 — Column profile usage

Figure 175 illustrates cardinal point alignment.

NOTE  It has to be guaranteed that the use of IfcCardinalPointEnum is consistent to the placement of the extrusion body provided by IfcExtrudedAreaSolid.Position
NOTE  The cardinal points 7 (top left), and 6 (mid-depth right) are assigned according to the definition at IfcCardinalPointReference
Cardinal point usage

Figure 175 — Column cardinal points

Figure 176 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.

Material profile set and usage

Figure 176 — Column composite profiles

Product Placement

The Product Placement concept applies to this entity as shown in Table 106.
IfcLocalPlacementIfcLocalPlacementRelative placement according to position and rotation relative to container.
IfcLocalPlacement Absolute placement according to position and rotation of world coordinate system.
IfcGridPlacement Placement according to grid intersection.

Table 106 — IfcColumnStandardCase Product Placement

The following restriction is imposed:

Axis 3D Geometry

The Axis 3D Geometry concept applies to this entity as shown in Table 107.
AxisCurve3DIfcBoundedCurveThree-dimensional reference curve for the column.

Table 107 — IfcColumnStandardCase Axis 3D Geometry

The following additional constraints apply to the 'Axis' representation, if the 'Body' shape representation has the RepresentationType : 'SweptSolid':


EXAMPLE  As shown in Figure 177, the axis shall be defined along the z axis of the object coordinate system. The axis representation can be used to represent the system length of a column that may extent the body length of the column.

Figure 177 — Column axis representation

EXAMPLE  As shown in Figure 178, the axis representation shall be used to represent the cardinal point as the offset between the 'Axis' and the extrusion path of the column. 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 178 — Column axis cardinal point


Body SweptSolid Geometry

The Body SweptSolid Geometry concept applies to this entity.

The following additional constraints apply to the 'SweptSolid' representation:

Figure 179 illustrates a standard geometric representation with cardinal point applied as 5 (mid-depth centre).

The following interpretation of dimension parameter applies for rectangular columns:

The following interpretation of dimension parameter applies for circular columns:

standard column

Figure 179 — Column body extrusion

Body AdvancedSweptSolid Geometry

The Body AdvancedSweptSolid Geometry concept applies to this entity.

The following additional constraints apply to the 'AdvancedSweptSolid' representation type:

Body Clipping Geometry

The Body Clipping Geometry concept applies to this entity.

The following constraints apply to the 'Clipping' representation:

Figure 180 illustrates a 'Clipping' geometric representation with use of IfcBooleanClippingResult between an IfcExtrudedAreaSolid and an IfcHalfSpaceSolid to create a clipped body, with cardinal point applied as 2 (bottom centre).

clipped column

Figure 180 — Column body clipping

XSD Specification:

 <xs:element name="IfcColumnStandardCase" type="ifc:IfcColumnStandardCase" substitutionGroup="ifc:IfcColumn" nillable="true"/>
 <xs:complexType name="IfcColumnStandardCase">
   <xs:extension base="ifc:IfcColumn"/>

EXPRESS Specification:

ENTITY IfcColumnStandardCase

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

HasMaterialProfileSetUsage : A valid instance of IfcColumnStandardCase relies on the provision of an IfcMaterialProfileSetUsage.

Inheritance Graph:

ENTITY IfcColumnStandardCase
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProduct
ObjectPlacement : OPTIONAL IfcObjectPlacement;
Representation : OPTIONAL IfcProductRepresentation;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcBuildingElement
HasCoverings : SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
ENTITY IfcColumn
PredefinedType : OPTIONAL IfcColumnTypeEnum;
ENTITY IfcColumnStandardCase

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