Decke / Dachfläche / Bodenplatte | |
Slab | |
Dalle |
Item | SPF | XML | Change | Description | 4.0.0.0 |
---|---|---|---|---|
IfcSlab | ||||
OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. |
A slab is a component of the construction that normally encloses a space vertically. The slab may provide the lower support (floor) or upper construction (roof slab) in any space in a building.
NOTE Definition according to ISO 6707-1
thick, flat or shaped component, usually larger than 300 mm square, used to form a covering or projecting from a building.
Only the core or constructional part of this construction is considered to be a slab. The upper finish (flooring, roofing) and the lower finish (ceiling, suspended ceiling) are considered to be coverings. A special type of slab is the landing, described as a floor section to which one or more stair flights or ramp flights connect.
NOTE There is a representation of slabs for structural analysis provided by a proper subtype of IfcStructuralMember being part of the IfcStructuralAnalysisModel.
NOTE An arbitrary planar element to which this semantic information is not applicable or irrelevant shall be modeled as IfcPlate.
There are two main representations for slab occurrences:
NOTE The entity IfcSlabStandardCase has been deprecated, IfcSlab with IfcMaterialLayerSetUsage is used instead.
NOTE The entity IfcSlabElementedCase has been deprecated, IfcSlab> with IfcRelAggregates is used to describe occurrences of slabs which are aggregated from subordinate elements,.
HISTORY New entity in IFC2.0; it is a merger of the two previous entities IfcFloor, IfcRoofSlab, introduced in IFC1.0
# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|
9 | PredefinedType | IfcSlabTypeEnum | ? |
Predefined generic type for a slab that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcSlabType is assigned, providing its own IfcSlabType.PredefinedType. IFC2x CHANGE The attribute has been changed into an OPTIONAL attribute. | X |
Rule | Description |
---|---|
CorrectPredefinedType | Either the PredefinedType attribute is unset (e.g. because an IfcSlabType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
CorrectTypeAssigned | Either there is no slab type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcSlabType. |
# | Attribute | Type | Cardinality | Description | G |
---|---|---|---|---|---|
IfcRoot | |||||
1 | GlobalId | IfcGloballyUniqueId | Assignment of a globally unique identifier within the entire software world. | X | |
2 | OwnerHistory | IfcOwnerHistory | ? |
Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE only the last modification in stored - either as addition, deletion or modification. IFC4 CHANGE The attribute has been changed to be OPTIONAL. | X |
3 | Name | IfcLabel | ? | Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. | X |
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. | X |
IfcObjectDefinition | |||||
HasAssignments | IfcRelAssigns @RelatedObjects | S[0:?] | Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups. | X | |
Nests | IfcRelNests @RelatedObjects | S[0:1] | References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition. | X | |
IsNestedBy | IfcRelNests @RelatingObject | S[0:?] | References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).
IFC4 CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition. | X | |
HasContext | IfcRelDeclares @RelatedDefinitions | S[0:1] | References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.
IFC4 CHANGE The inverse attribute datatype has been added. | X | |
IsDecomposedBy | IfcRelAggregates @RelatingObject | S[0:?] | References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).
IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates. | X | |
Decomposes | IfcRelAggregates @RelatedObjects | S[0:1] | References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates. | X | |
HasAssociations | IfcRelAssociates @RelatedObjects | S[0:?] | Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification. | X | |
IfcObject | |||||
5 | ObjectType | IfcLabel | ? |
The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.
| X |
IsDeclaredBy | IfcRelDefinesByObject @RelatedObjects | S[0:1] | Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange. | X | |
Declares | IfcRelDefinesByObject @RelatingObject | S[0:?] | Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange. | X | |
IsTypedBy | IfcRelDefinesByType @RelatedObjects | S[0:1] | Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.
IFC4 CHANGE New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange. | X | |
IsDefinedBy | IfcRelDefinesByProperties @RelatedObjects | S[0:?] | Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.
IFC4 CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange. | X | |
IfcProduct | |||||
6 | ObjectPlacement | IfcObjectPlacement | ? | Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system. | X |
7 | Representation | IfcProductRepresentation | ? | Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement. | X |
ReferencedBy | IfcRelAssignsToProduct @RelatingProduct | S[0:?] | Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product. | X | |
IfcElement | |||||
8 | Tag | IfcIdentifier | ? | The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level. | X |
FillsVoids | IfcRelFillsElement @RelatedBuildingElement | S[0:1] | Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element. | X | |
ConnectedTo | IfcRelConnectsElements @RelatingElement | S[0:?] | Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to. | X | |
IsInterferedByElements | IfcRelInterferesElements @RelatedElement | S[0:?] | Reference to the interference relationship to indicate the element that is interfered. The relationship, if provided, indicates that this element has an interference with one or many other elements.
NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements. IFC4 CHANGE New inverse relationship. | X | |
InterferesElements | IfcRelInterferesElements @RelatingElement | S[0:?] | Reference to the interference relationship to indicate the element that interferes. The relationship, if provided, indicates that this element has an interference with one or many other elements.
NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements. IFC4 CHANGE New inverse relationship. | X | |
HasProjections | IfcRelProjectsElement @RelatingElement | S[0:?] | Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement. | X | |
ReferencedInStructures | IfcRelReferencedInSpatialStructure @RelatedElements | S[0:?] | Reference relationship to the spatial structure element, to which the element is additionally associated. This relationship may not be hierarchical, an element may be referenced by zero, one or many spatial structure elements.
IFC2x3 CHANGE The inverse attribute has been added with upward compatibility for file based exchange. | X | |
HasOpenings | IfcRelVoidsElement @RelatingBuildingElement | S[0:?] | Reference to the IfcRelVoidsElement relationship that creates an opening in an element. An element can incorporate zero-to-many openings. For each opening, that voids the element, a new relationship IfcRelVoidsElement is generated. | X | |
IsConnectionRealization | IfcRelConnectsWithRealizingElements @RealizingElements | S[0:?] | Reference to the connection relationship with realizing element. The relationship, if provided, assigns this element as the realizing element to the connection, which provides the physical manifestation of the connection relationship. | X | |
ProvidesBoundaries | IfcRelSpaceBoundary @RelatedBuildingElement | S[0:?] | Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces. | X | |
ConnectedFrom | IfcRelConnectsElements @RelatedElement | S[0:?] | Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element. | X | |
ContainedInStructure | IfcRelContainedInSpatialStructure @RelatedElements | S[0:1] | Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierachical, i.e. an element may only be assigned directly to zero or one spatial structure. | X | |
HasCoverings | IfcRelCoversBldgElements @RelatingBuildingElement | S[0:?] | Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElement. It defines the concept of an element having coverings associated. | X | |
IfcBuildingElement | |||||
IfcSlab | |||||
9 | PredefinedType | IfcSlabTypeEnum | ? |
Predefined generic type for a slab that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcSlabType is assigned, providing its own IfcSlabType.PredefinedType. IFC2x CHANGE The attribute has been changed into an OPTIONAL attribute. | X |
Object Typing
The Object Typing concept template applies to this entity as shown in Table 158.
| ||||
Table 158 — IfcSlab Object Typing |
Property Sets for Objects
The Property Sets for Objects concept template applies to this entity as shown in Table 159.
Quantity Sets
The Quantity Sets concept template applies to this entity as shown in Table 160.
| ||||
Table 160 — IfcSlab Quantity Sets |
Material Layer Set
The Material Layer Set concept applies to this entity.
The material information of the IfcSlab is defined by IfcMaterialLayerSet, or as fallback by IfcMaterial, and it is attached either directly or at the IfcSlabType. In this case, the material information does not allow to construct a shape by applying the layer definition to the plane of the shape representation, to enable this parametric definition, the IfcMaterialLayerSetUsage has to be used instead.
Material Layer Set Usage
The Material Layer Set Usage concept applies to this entity.
The material of IfcSlab can be defined by IfcMaterialLayerSetUsage and attached by IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship. Multi-layer slabs can be represented by refering to several IfcMaterialLayer's within the IfcMaterialLayerSet that is referenced from th e IfcMaterialLayerSetUsage.
When assigning an IfcMaterialLayerSetUsage to IfcSlab it shall imply that the IfcSlabType should have a unique IfcMaterialLayerSet, that is referenced by IfcMaterialLayerSetUsage assigned to all occurrences of this IfcSlabType.
EXAMPLE Figure 262 illustrates assignment of IfcMaterialLayerSetUsage and IfcMaterialLayerSet to the IfcSlab as the slab occurrence and to the IfcSlabType. The same IfcMaterialLayerSet shall be shared by many occurrences of IfcMaterialLayerSetUsage. This relationship shall be consistent to the relationship between the IfcSlabType and the IfcSlabStandardCase. |
|
Figure 262 — Slab type definition |
Figure 263 illustrates slab material usage, where the following conventions shall be met:
Figure 263 — Slab material layers |
Spatial Containment
The Spatial Containment concept template applies to this entity as shown in Table 161.
| ||||||||
Table 161 — IfcSlab Spatial Containment |
The IfcSlab, as any subtype of IfcBuildingElement, may participate alternatively in one of the two different containment relationships:
Surface Geometry
The Surface Geometry concept applies to this entity.
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).
Body SweptSolid Geometry
The Body SweptSolid Geometry concept applies to this entity.
The following constraints apply to the 'SweptSolid' representation:
Figure 264 illustrates a 'SweptSolid' geometric representation.
NOTE The following interpretation of dimension parameter applies for polygonal slabs (in ground floor view):
- IfcArbitraryClosedProfileDef.OuterCurve: closed bounded curve interpreted as area (or foot print) of the slab.
Figure 264 — Slab body extrusion |
The following additional constraints apply to the 'SweptSolid' representation, when an IfcMaterialLayerSetUsage is assigned to the IfcSlab:
EXAMPLE Figure 265 illustrates a 'SweptSolid' geometric representation. The following interpretation of dimension parameter applies for polygonal slabs (in ground floor view): IfcArbitraryClosedProfileDef.OuterCurve: closed bounded curve interpreted as area (or foot print) of the slab. |
|
Figure 265 — Slab body extrusion |
Body Clipping Geometry
The Body Clipping Geometry concept applies to this entity.
The following constraints apply to the 'Clipping' representation:
Figure 266 illustrates a 'Clipping' geometric representation with definition of a roof slab using advanced geometric representation. The profile is extruded non-perpendicular and the slab body is clipped at the eave.
Figure 266 — Slab body clipping |
The following constraints apply to the 'Clipping' representation, when an IfcMaterialLayerSetUsage is assigned to the IfcSlab:
EXAMPLE Figure 267 illustrates a 'Clipping' geometric representation with definition of a roof slab using advanced geometric representation. The profile is extruded non-perpendicular and the slab body is clipped at the eave. |
|
Figure 267 — Slab body clipping |
<?xml version="1.0"?>
<ConceptRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" uuid="5ae6aa9b-4593-41d7-9655-423f2a51d4e4" name="IfcSlab" status="sample" applicableRootEntity="IfcSlab">
<Concepts>
<Concept uuid="c735df4f-e31d-4960-9463-8dc1eeb291b4" name="Object Typing" status="sample" override="false">
<Template ref="35a2e10e-20df-40f4-ab2f-dacf0a6744f4" />
<TemplateRules operator="and">
<TemplateRule Parameters="RelatingType[Type]='IfcSlabType'" />
</TemplateRules>
</Concept>
<Concept uuid="c832ca52-ff5e-472f-a506-007bed00ef46" name="Property Sets for Objects" status="sample" override="false">
<Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
<TemplateRules operator="and">
<TemplateRule Parameters="PsetName[Value]='Pset_SlabCommon'" />
<TemplateRule Parameters="PsetName[Value]='Pset_ConcreteElementGeneral'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementFabrication'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementGeneral'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastSlab'" />
<TemplateRule Parameters="PsetName[Value]='Pset_ReinforcementBarPitchOfSlab'" />
</TemplateRules>
</Concept>
<Concept uuid="e5df49c5-071d-46fc-8a89-2b08744235ef" name="Quantity Sets" status="sample" override="false">
<Template ref="6652398e-6579-4460-8cb4-26295acfacc7" />
<TemplateRules operator="and">
<TemplateRule Parameters="QsetName[Value]='Qto_SlabBaseQuantities'" />
</TemplateRules>
</Concept>
<Concept uuid="c3149743-3aa6-468f-9534-e2d508129c83" name="Material Layer Set" status="sample" override="false">
<Template ref="dfb5b3a9-50e3-46e2-8518-1f03e7cfd886" />
</Concept>
<Concept uuid="9216573e-6928-41a5-88fd-0b49c20a7309" name="Material Layer Set Usage" status="sample" override="false">
<Template ref="6d5fb86f-3f2d-49fb-9528-077855ddcc47" />
</Concept>
<Concept uuid="450ddcc2-674b-4851-8339-204d36d209ce" name="Spatial Containment" status="sample" override="false">
<Template ref="d9a3f822-0014-4bc2-8d94-9d9067759045" />
<TemplateRules operator="and">
<TemplateRule Description="Default spatial container" Parameters="RelatingStructure[Type]='IfcBuildingStorey'" />
<TemplateRule Description="Spatial container for the element if it cannot be assigned to a building storey" Parameters="RelatingStructure[Type]='IfcBuilding'" />
<TemplateRule Description="Spatial container for the element in case that it is placed on site (outside of building)" Parameters="RelatingStructure[Type]='IfcSite'" />
</TemplateRules>
</Concept>
<Concept uuid="9fb59106-f67f-4c36-99b5-62538a173f98" name="Surface Geometry" status="sample" override="false">
<Template ref="2e99de70-fb73-478f-9bca-4fedfdeb4ea5" />
</Concept>
<Concept uuid="0a146d06-df59-4562-b075-cdccd1a7e1f6" name="Body SweptSolid Geometry" status="sample" override="false">
<Template ref="cb7c18fa-cf83-4db1-be1b-c013ba4ed672" />
</Concept>
<Concept uuid="0b434ff6-66be-43f1-9550-fccff87e07eb" name="Body Clipping Geometry" status="sample" override="false">
<Template ref="2cdbc2f5-9b0c-43ea-9d2a-9d72d0147e00" />
</Concept>
</Concepts>
</ConceptRoot>
# | Concept | Template | Model View |
---|---|---|---|
IfcRoot | |||
Identity | Software Identity | General Usage | |
Revision Control | Revision Control | General Usage | |
IfcObjectDefinition | |||
Classification Association | Classification | General Usage | |
IfcObject | |||
Object User Identity | Object User Identity | General Usage | |
Object Predefined Type | Object Predefined Type | General Usage | |
Property Sets with Override | Property Sets with Override | General Usage | |
IfcProduct | |||
Product Placement | Product Placement | General Usage | |
Product Geometric Representation | Product Geometric Representation | General Usage | |
IfcElement | |||
Product Local Placement | Product Local Placement | General Usage | |
CoG Geometry | CoG Geometry | General Usage | |
Box Geometry | Box Geometry | General Usage | |
FootPrint Geometry | FootPrint Geometry | General Usage | |
Body SurfaceOrSolidModel Geometry | Body SurfaceOrSolidModel Geometry | General Usage | |
Body SurfaceModel Geometry | Body SurfaceModel Geometry | General Usage | |
Body Tessellation Geometry | Body Tessellation Geometry | General Usage | |
Body Brep Geometry | Body Brep Geometry | General Usage | |
Body AdvancedBrep Geometry | Body AdvancedBrep Geometry | General Usage | |
Body CSG Geometry | Body CSG Geometry | General Usage | |
Mapped Geometry | Mapped Geometry | General Usage | |
Element Voiding | Element Voiding | General Usage | |
Element Projecting | Element Projecting | General Usage | |
IfcBuildingElement | |||
Product Assignment | Product Assignment | General Usage | |
Surface 3D Geometry | Surface 3D Geometry | General Usage | |
IfcSlab | |||
Object Typing | Object Typing | General Usage | |
Property Sets for Objects | Property Sets for Objects | General Usage | |
Quantity Sets | Quantity Sets | General Usage | |
Material Layer Set | Material Layer Set | General Usage | |
Material Layer Set Usage | Material Layer Set Usage | General Usage | |
Spatial Containment | Spatial Containment | General Usage | |
Surface Geometry | Surface Geometry | General Usage | |
Body SweptSolid Geometry | Body SweptSolid Geometry | General Usage | |
Body Clipping Geometry | Body Clipping Geometry | General Usage |
<xs:element name="IfcSlab" type="ifc:IfcSlab" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
<xs:complexType name="IfcSlab">
<xs:complexContent>
<xs:extension base="ifc:IfcBuildingElement">
<xs:attribute name="PredefinedType" type="ifc:IfcSlabTypeEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcSlab
SUPERTYPE OF(ONEOF(IfcSlabElementedCase, IfcSlabStandardCase))
SUBTYPE OF (IfcBuildingElement);
PredefinedType : OPTIONAL IfcSlabTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcSlabTypeEnum.USERDEFINED) OR
((PredefinedType = IfcSlabTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
('IFCSHAREDBLDGELEMENTS.IfcSlabType' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;