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The element type IfcBeamType defines commonly shared information for occurrences of beams. The set of shared information may include:
- common properties within shared property sets
- common material information
- common profile definitions
- common shape representations
It is used to define a beam specification, or beam style (the specific product information that is common to all occurrences of that beam type). Beam types may be exchanged without being already assigned to occurrences.
Occurrences of the IfcBeamType within building models are represented by instances of IfcBeamStandardCase if the IfcBeamType has a single associated IfcMaterialProfileSet; otherwise they are represented by instances of IfcBeam. Occurrences of the IfcBeamType within structural analysis models are represented by instances of IfcStructuralCurveMember, or its applicable subtypes.
HISTORY New entity in IFC2x2.
Common Use Definitions
The following concepts are inherited at supertypes:
Material Profile Set
The Material Profile Set concept applies to this entity.
The material of the IfcBeamType is defined by the IfcMaterialProfileSet or as fall back by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.
NOTE It is illegal to assign an IfcMaterial to an IfcBeamType, if there is at least one occurrence of IfcBeamStandardCase for this type.
The shared profile definition is defined by assigning an IfcMaterialProfileSet (see material use definition above). The IfcMaterialProfile refers to the subtype of IfcProfileDef that is the common profile for all beam occurrence, if used. It is only applicable if the IfcBeamType has only occurrences of type IfcBeamStandardCase (see definition of IfcBeamStandardCase for further information).
NOTE The attribute ProfileName of the IfcProfileDef subtype, referenced in IfcMaterialProfile should contain a standardized profile name according to local standards. However, an additional geometric representation of the profile is necessary (such as IfcExtrudedAreaSolid). An importing application is allowed to check for the existence of the profile name: in case of identifying it as a standardized name, the corresponding profile geometry and possibly other cross sectional properties can be read from a library. Otherwise the geometric representation and possible non geometric IfcProfileProperties have to be used.
Type Body Geometry
The Type Body Geometry concept applies to this entity as shown in Table 89.
Table 89 — IfcBeamType Type Body Geometry
The IfcBeamType may define the shared geometric representation for all beam occurrences. The RepresentationMaps attribute refers to a list of IfcRepresentationMap's, that allow for multiple geometric representations (e.g. with IfcShaperepresentation's having an RepresentationIdentifier 'Box', 'Axis', or 'Body'). It is only applicable if the IfcBeamType has only occurrences of type IfcBeam (See geometric use definition of IfcBeam for further information).
NOTE If the IfcBeamType has an associated IfcMaterialProfileSet, then no shared geometric representation shall be provided.
NOTE The product shape representations are defined as RepresentationMaps (attribute of the supertype IfcTypeProduct), which get assigned by an element occurrence instance through the IfcShapeRepresentation.Item[n] being an IfcMappedItem. See IfcTypeProduct for further information.
NOTE The values of attributes RepresentationIdentifier and RepresentationType of IfcShapeRepresentation are restricted in the same way as those for IfcBeam and IfcBeamStandardCase
XSD Specification: <xs:element name="IfcBeamType" type="ifc:IfcBeamType" substitutionGroup="ifc:IfcBuildingElementType" nillable="true"/>
<xs:attribute name="PredefinedType" type="ifc:IfcBeamTypeEnum" use="optional"/>
|CorrectPredefinedType|| : ||(PredefinedType <> IfcBeamTypeEnum.USERDEFINED) OR
((PredefinedType = IfcBeamTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));|
|PredefinedType|| : ||
Identifies the predefined types of a beam element from which the type required may be set.
|CorrectPredefinedType|| : ||
The inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.
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