5.4.3.3 IfcBuildingStorey
The building storey has an
elevation and typically represents a (nearly) horizontal
aggregation of spaces that are vertically bound.
A storey is (if specified) associated to a building. A storey
may span over several connected storeys. Therefore storey complex
provides for a collection of storeys included in a building. A
storey can also be decomposed in (horizontical) parts, where each
part defines a partial storey. This is defined by the composition
type attribute of the supertype
IfcSpatialStructureElements which is interpreted as
follow:
- COMPLEX: building storey complex
- ELEMENT: building storey
- PARTIAL: partial building storey
EXAMPLE In split level houses, a storey is split into two or more partial storeys, each with a different elevation. It can be handled by defining a storey, which includes two or more partial storeys with the individual elevations.
The IfcBuildingStorey is used to build the spatial
structure of a building (that serves as the primary project
breakdown and is required to be hierarchical). The spatial
structure elements are linked together by using the objectified
relationship IfcRelAggregates.
Figure 29 shows the IfcBuildingStorey as part of the
s patial structure. It also serves as the spatial container for
building and other elements.
NOTE Detailed requirements on mandatory element
containment and placement structure relationships are given in
view definitions and implementer agreements.
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Figure 29 — Building storey composition
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HISTORY New entity in IFC1.0
Attribute Use Definition
Figure 30 describes the heights and elevations of the IfcBuildingStorey.
- elevation of storey provided by: IfcBuildingStorey.Elevation as a local height value
relative to IfcBuilding.ElevationOfRefHeight, it is usually the top of construction slab
- net height of storey, also referred to as total height or system height (top of construction slab to top of construction slab above): provided by BaseQuantity with Name="GrossHeight"
- net height of storey (top of construction slab to bottom of construction slab above): provided by BaseQuantity with Name="NetHeight"
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Figure 30 — Building storey elevations |
Construction Operations
A building storey has an elevation and typically represents a (nearly) horizontal aggregation of spaces that are vertically bound.
Instance diagram
Identity
The Identity concept applies to this entity.
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Revision Control
The Revision Control concept applies to this entity.
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External Data Constraints
The External Data Constraints concept applies to this entity as shown in Table 16.
| Table | Name | Reference | Format | Color |
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| Floor | Name | IfcBuildingStorey.Name | Key | #FFFF99 |
| Floor | CreatedBy | IfcBuildingStorey.OwnerHistory\IfcOwnerHistory.OwningUser\IfcPersonAndOrganization.ThePerson\IfcPerson.Identification | | #FFCC99 |
| Floor | CreatedOn | IfcBuildingStorey.OwnerHistory\IfcOwnerHistory.CreationDate | | #FFFF99 |
| Floor | Category | IfcBuildingStorey.HasAssociations[*]\IfcRelAssociatesClassification.RelatingClassification\IfcClassificationReference.Identification | | #FFCC99 |
| Floor | ExtSystem | IfcBuildingStorey.OwnerHistory\IfcOwnerHistory.OwningApplication\IfcApplication.ApplicationIdentifier | | #CC99FF |
| Floor | ExtObject | IfcBuildingStorey\ | | #CC99FF |
| Floor | ExtIdentifier | IfcBuildingStorey.GlobalId | | #CC99FF |
| Floor | Description | IfcBuildingStorey.Description | | #CCFFCC |
| Floor | Elevation | IfcBuildingStorey.Elevation | | #CCFFCC |
| Floor | Height | IfcBuildingStorey.IsDefinedBy['Qto_BuildingStoreyBaseQuantities']\IfcRelDefinesByProperties.RelatingPropertyDefinition\IfcElementQuantity.Quantities['NetHeight']\IfcQuantityLength.LengthValue | | #CCFFCC |
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Table 16 — IfcBuildingStorey External Data Constraints |
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Spatial Composition
The Spatial Composition concept applies to this entity as shown in Table 17.
| Spatial Composite | Description |
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| | Each building storey is contained within a building. |
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Table 17 — IfcBuildingStorey Spatial Composition |
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Quantities on Occurrences
The Quantities on Occurrences concept applies to this entity as shown in Table 18.
| Qset | Type | Quantity | Description |
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| | IfcQuantityLength | | Height from the lowest elevation of the ceiling to the highest elevation of the flooring, excluding any impacts from staircases. |
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Table 18 — IfcBuildingStorey Quantities on Occurrences |
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XSD Specification:
<xs:element name="IfcBuildingStorey" type="ifc:IfcBuildingStorey" substitutionGroup="ifc:IfcSpatialStructureElement" nillable="true"/>
<xs:complexType name="IfcBuildingStorey">
<xs:complexContent>
<xs:extension base="ifc:IfcSpatialStructureElement"/>
</xs:complexContent>
</xs:complexType>
EXPRESS Specification:
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| Elevation | : | OPTIONAL IfcStrippedOptional; |
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Attribute Definitions:
| Elevation | : | Elevation of the base of this storey, relative to the 0,00 internal reference height of the building. The 0.00 level is given by the absolute above sea level height by the ElevationOfRefHeight attribute given at IfcBuilding. |
Inheritance Graph:
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| ObjectType | : | OPTIONAL IfcStrippedOptional; |
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| ObjectPlacement | : | OPTIONAL IfcStrippedOptional; |
| Representation | : | OPTIONAL IfcStrippedOptional; |
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| LongName | : | OPTIONAL IfcStrippedOptional; |
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| CompositionType | : | OPTIONAL IfcStrippedOptional; |
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| Elevation | : | OPTIONAL IfcStrippedOptional; |
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