|Decke / Dachfläche / Bodenplatte elementiert|
defines a slab with certain constraints for the provision of its
components. The IfcSlabElementedCase handles all cases of
slabs, that are decomposed into parts:
HISTORY New entity in IFC4.
Voiding Use Definition:
As shown in Figure 210, openings within the composite slab are directly assigned to IfcSlabElementedCase using IfcRelVoidsElement pointing to IfcOpeningElement and apply to all aggregated parts. If individual parts have cutting and other voiding features, then the decomposed parts have a separate voiding relationship IfcRelVoidsElement pointing to IfcVoidingFeature.
Figure 210 — Slab elemented voiding
Common Use Definitions
The following concepts are inherited at supertypes:
- IfcRoot: Identity, Revision Control
- IfcElement: Box Geometry, FootPrint Geometry, Body SurfaceOrSolidModel Geometry, Body SurfaceModel Geometry, Body Tessellation Geometry, Body Brep Geometry, Body AdvancedBrep Geometry, Body CSG Geometry, Mapped Geometry
- IfcBuildingElement: Surface 3D Geometry
- IfcSlab: Object Typing, Property Sets for Objects, Quantity Sets, Material Layer Set, Spatial Containment, Body SweptSolid Geometry, Body Clipping Geometry, Element Voiding, Product Assignment
The Object Aggregation concept applies to this entity as shown in Table 170.
| ||IfcBeam||Slabs may be aggregated into beams for joists.|
| ||IfcPlate||Slabs may be aggregated into plates for decking.|
| ||IfcBuildingElementPart||Slabs may be aggregated into parts for other elements.|
Table 170 — IfcSlabElementedCase Object Aggregation
The following guidance is provided for the components of the
IfcSlabElementedCase. The following component entity types
should be used:
- Precast hollow core slabs
The Product Placement concept applies to this entity as shown in Table 171.
Table 171 — IfcSlabElementedCase Product Placement
The use of local placement is defined at the supertype
IfcSlab. The local placement of the
IfcSlabElementedCase defines the parent coordinate systems
for the parts within the decomposition. All parts shall be
positioned relative to the IfcSlabElementedCase.
The Surface Geometry concept applies to this entity.
A three-dimensional surface being a subtype
of IfcBoundedSurface defining the reference surface for
the elemented slab. It maybe used as a simplified representation
directly at the elemented slab.
NOTE It is invalid to exhange a 'Body' shape
representation of an IfcSlabElementedCase. The body
geometry is defined by the parts within the
NOTE The 'Surface' can be used to define a
surfacic model of the building (e.g. for analytical purposes, or
for reduced Level of Detail representation). It should suppress
the geometric details of the parts in the
XSD Specification: <xs:element name="IfcSlabElementedCase" type="ifc:IfcSlabElementedCase" substitutionGroup="ifc:IfcSlab" nillable="true"/>
|HasDecomposition|| : ||HIINDEX(SELF\IfcObjectDefinition.IsDecomposedBy) > 0;|
|HasDecomposition|| : ||
A valid instance of IfcWallElementedCase has to have parts in a decomposition hierarchy.
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