Gruppe von Materialschichten | |
Material Layer Set | |
Ensemble de couches de matériau homogène |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcMaterialLayerSet | ||||
Description | ADDED |
The IfcMaterialLayerSet is a designation by which materials of an element constructed of a number of material layers is known and through which the relative positioning of individual layers can be expressed.
The Material Layer Set Base (MlsBase) describes the imaginary axis along which the material layers are positioned.
EXAMPLE A cavity brick wall would be modeled as IfcMaterialLayerSet consisting of three IfcMaterialLayer's: brick, air cavity and brick. The air gap is identified by the IsVentilated flag at IfcMaterialLayer.
HISTORY New entity in IFC1.0
IFC4 CHANGE Subtyped from IfcMaterialDefinition, the attribute Description has been added at the end of attribute list.
Attribute use definition
As shown in Figure 352, each IfcMaterialLayerSet implicitly defines a material layer set base line (MlsBase), to which the start of the first IfcMaterialLayer is aligned. The total thickness of a layer set is calculated from the individual layer thicknesses, the first layer starting from the MlsBase and following layers being placed on top of the previous (no gaps or overlaps).
Figure 352 — Material layer set |
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
1 | MaterialLayers | IfcMaterialLayer | L[1:?] | Identification of the IfcMaterialLayer’s from which the IfcMaterialLayerSet is composed. | X |
2 | LayerSetName | IfcLabel | [0:1] | The name by which the IfcMaterialLayerSet is known. | X |
3 | Description | IfcText | [0:1] | Definition of the IfcMaterialLayerSet in descriptive terms. | X |
TotalThickness :=IfcMlsTotalThickness(SELF) | IfcLengthMeasure | [1:1] | Total thickness of the material layer set is derived from the function IfcMlsTotalThickness. | X |
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
IfcMaterialDefinition | |||||
AssociatedTo | IfcRelAssociatesMaterial @RelatingMaterial | S[0:?] | Use of the IfcMaterialDefinition subtypes within the material association of an element occurrence or element type. The association is established by the IfcRelAssociatesMaterial relationship. | X | |
HasExternalReferences | IfcExternalReferenceRelationship @RelatedResourceObjects | S[0:?] | Reference to external references, e.g. library, classification, or document information, that are associated to the material. | X | |
HasProperties | IfcMaterialProperties @Material | S[0:?] | Material properties assigned to instances of subtypes of IfcMaterialDefinition. | X | |
IfcMaterialLayerSet | |||||
1 | MaterialLayers | IfcMaterialLayer | L[1:?] | Identification of the IfcMaterialLayer’s from which the IfcMaterialLayerSet is composed. | X |
2 | LayerSetName | IfcLabel | [0:1] | The name by which the IfcMaterialLayerSet is known. | X |
3 | Description | IfcText | [0:1] | Definition of the IfcMaterialLayerSet in descriptive terms. | X |
TotalThickness :=IfcMlsTotalThickness(SELF) | IfcLengthMeasure | [1:1] | Total thickness of the material layer set is derived from the function IfcMlsTotalThickness. | X |
<xs:element name="IfcMaterialLayerSet" type="ifc:IfcMaterialLayerSet" substitutionGroup="ifc:IfcMaterialDefinition" nillable="true"/>
<xs:complexType name="IfcMaterialLayerSet">
<xs:complexContent>
<xs:extension base="ifc:IfcMaterialDefinition">
<xs:sequence>
<xs:element name="MaterialLayers">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcMaterialLayer" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcMaterialLayer"/>
<xs:attribute ref="ifc:cType" fixed="list"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="LayerSetName" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcMaterialLayerSet
SUBTYPE OF (IfcMaterialDefinition);
MaterialLayers : LIST [1:?] OF IfcMaterialLayer;
LayerSetName : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
DERIVE
TotalThickness : IfcLengthMeasure := IfcMlsTotalThickness(SELF);
END_ENTITY;