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The IfcSlabElementedCase 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:

 Instance diagram

Object Aggregation

The Object Aggregation concept applies to this entity as shown in Table 170.
 IfcBeamSlabs may be aggregated into beams for joists.
 IfcPlateSlabs may be aggregated into plates for decking.
 IfcBuildingElementPartSlabs 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:

Product Placement

The Product Placement concept applies to this entity as shown in Table 171.
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 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.

Surface Geometry

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 decomposition.
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 decomposition.

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcSlabElementedCase
HasDecomposition : HIINDEX(SELF\IfcObjectDefinition.IsDecomposedBy) > 0;

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

HasDecomposition : A valid instance of IfcWallElementedCase has to have parts in a decomposition hierarchy.

Inheritance Graph:

ENTITY IfcSlabElementedCase
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;
PredefinedType : OPTIONAL IfcSlabTypeEnum;
ENTITY IfcSlabElementedCase

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