#### 6.1.3.8 IfcSlabElementedCase

| Decke / Dachfläche / Bodenplatte elementiert
| Dalle composite

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:

- having components being assigned to the IfcSlabElementedCase using the IfcRelAggregates relationship accessible by the inverse relationship IsDecomposedBy.
- applying the constraint that the parts within the decomposition shall be of type IfcBeam, IfcMember, IfcPlate, IfcBuildingElementPart or IfcBuildingElementProxy.

> HISTORY New entity in IFC4.

Voiding Use Definition:

As shown in Figure 108, 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 108 — Slab elemented voiding

## Plumbing System Design

The following concepts are inherited at supertypes:

- IfcSlab: Voiding

Instance diagram

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

Aggregation

The Aggregation concept applies to this entity as shown in Table 33.

PredefinedType | RelatedObjects | Description
--- | --- | ---
| 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 33 — IfcSlabElementedCase Aggregation

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | O |  |  | O | O | O

Placement

The Placement concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

Surface Geometry

The Surface Geometry concept applies to this entity as shown in Table 34.

RepresentationType | Geometry
--- | ---
Surface3D | IfcBoundedSurface
Table 34 — IfcSlabElementedCase Surface Geometry

The standard geometric representation of IfcSlabElementedCase is defined using the following multiple shape representations for its definition:

- Surface: 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.

The surfacic geometric representation of IfcSlabElementedCase is defined using the 'Surface' representation.

- RepresentationIdentifier : 'Surface'
- RepresentationType : 'Surface3D'

> 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.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | O |  |  | O | O | O

Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 35.

Structure | Description
--- | ---
IfcBuildingStorey | Elemented slabs are contained within the building storey supported by the slab.
Table 35 — IfcSlabElementedCase Spatial Containment

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcSlabElementedCase

| SUBTYPE OF (IfcSlab);

| WHERE

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

END_ENTITY;

Formal Propositions:

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

Inheritance Graph:

ENTITY IfcSlabElementedCase

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

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 IfcStrippedOptional;

| INVERSE

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;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcElement

Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

ConnectedTo | : | SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements | : | SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements | : | SET OF IfcRelInterferesElements FOR RelatingElement;
HasOpenings | : | SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
ProvidesBoundaries | : | SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom | : | SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure | : | SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

| ENTITY IfcBuildingElement

| INVERSE

| ENTITY IfcSlab

PredefinedType | : | OPTIONAL IfcStrippedOptional;

| ENTITY IfcSlabElementedCase

END_ENTITY;

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