6.1.3.43 IfcStairFlight

Treppenlauf
Volée d'escalier

A stair flight is an assembly of building components in a single "run" of stair steps (not interrupted by a landing). The stair steps and any stringers are included in the stair flight. A winder is also regarded a part of a stair flight.

An IfcStairFlight is normally aggregated by an IfcStair through the IfcRelAggregates relationship, the stair flight is then included in the set of IfcRelAggregates.RelatedObjects. An IfcStairFlight normally connects the floor slab of zero to two different storeys (or partial storeys, or landings) within a building. The connection relationship between the IfcStairFlight and the IfcSlab is expressed using the IfcRelConnectsElements relationship.

HISTORY  New entity in IFC2.0.

Currently, the 'Axis', 'FootPrint', 'Body', and 'Box' representations are supported. The 'Box' representation includes the representation type 'BoundingBox' and is explained at IfcBuildingElement.


Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 178.
Type
IfcStairFlightType

Table 178 — IfcStairFlight Object Typing



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 179.
PredefinedTypeName
 Pset_StairFlightCommon
 Pset_ConcreteElementGeneral
 Pset_PrecastConcreteElementFabrication
 Pset_PrecastConcreteElementGeneral
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 179 — IfcStairFlight Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 180.
Name
Qto_StairFlightBaseQuantities

Table 180 — IfcStairFlight Quantity Sets



Material Single

The Material Single concept applies to this entity.

The material of the IfcStairFlight is defined by the IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.



Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 181.
StructureDescription
IfcBuildingStoreyDefault spatial container, if the stair flight is not used (by default) as a part within a stair container.
IfcBuildingSpatial container for the element if it cannot be assigned to a building storey.
IfcSiteSpatial container for the element in case that it is placed on site (outside of building)

Table 181 — IfcStairFlight Spatial Containment

The IfcStairFlight, as any subtype of IfcBuildingElement, may participate alternatively in one of the two different containment relationships:

NOTE  Model view definitions or implementer agreements may force an IfcStairFlight to be solely used as a part within an IfcStair container. In this case, no Spatial containment shall be used.


Axis 2D Geometry

The Axis 2D Geometry concept applies to this entity.

The walking line is represented by a two-dimensional open curve as the axis. The curve is directed into the upward direction (direction has to be interpreted as specified at the subtypes of IfcCurve).

Figure 216 illustrates the axis representation which has the following constraints:

walking line

Figure 216 — Stair flight axis



FootPrint Geometry

The FootPrint Geometry concept applies to this entity as shown in Table 182.
IdentifierTypeItemsDescription
FootPrintGeometricCurveSet Any collection of points and curves representing the floor plan projection.
FootPrintAnnotation2D Any collection of points and curves, and additional hatching and text representing the floor plan projection.

Table 182 — IfcStairFlight FootPrint Geometry

The flight foot print, including the flight boundary is represented by a two-dimensional geometric curve set.

Figure 217 illustrates the footprint representation which has the following constraints:

boundary

Figure 217 — Stair flight footprint



Body SweptSolid Geometry

The Body SweptSolid Geometry concept applies to this entity.

Figure 218 illustrates the 'Body' geometric representation using a 'SweptSolid' representation type.

3D

Figure 218 — Stair flight body




XSD Specification:

 <xs:element name="IfcStairFlight" type="ifc:IfcStairFlight" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
 <xs:complexType name="IfcStairFlight">
  <xs:complexContent>
   <xs:extension base="ifc:IfcBuildingElement">
    <xs:attribute name="NumberOfRiser" type="xs:long" use="optional"/>
    <xs:attribute name="NumberOfTreads" type="xs:long" use="optional"/>
    <xs:attribute name="RiserHeight" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="TreadLength" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="PredefinedType" type="ifc:IfcStairFlightTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcStairFlight
SUBTYPE OF IfcBuildingElement;
NumberOfRiser : OPTIONAL INTEGER;
NumberOfTreads : OPTIONAL INTEGER;
RiserHeight : OPTIONAL IfcPositiveLengthMeasure;
TreadLength : OPTIONAL IfcPositiveLengthMeasure;
PredefinedType : OPTIONAL IfcStairFlightTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcStairFlightTypeEnum.USERDEFINED) OR ((PredefinedType = IfcStairFlightTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCSHAREDBLDGELEMENTS.IFCSTAIRFLIGHTTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

NumberOfRiser : Number of the risers included in the stair flight
IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.NumberOfRisers instead.
NumberOfTreads : Number of treads included in the stair flight.
IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.NumberOfTreads instead.
RiserHeight : Vertical distance from tread to tread. The riser height is supposed to be equal for all stairs in a stair flight.
IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.RiserHeight instead.
TreadLength : Horizontal distance from the front to the back of the tread. The tread length is supposed to be equal for all steps of the stair flight.
IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.TreadLength instead.
PredefinedType : Predefined generic type for a stair flight that is specified in an enumeration. There may be a property set given specificly for the predefined types.
NOTE  The PredefinedType shall only be used, if no IfcStairFlightType is assigned, providing its own IfcStairFlightType.PredefinedType.
IFC4 CHANGE The attribute has been added at the end of the entity definition.

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcStairFlightType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : Either there is no stair flight type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcStairFlightType.

Inheritance Graph:

ENTITY IfcStairFlight
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 IfcLabel;
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 IfcIdentifier;
INVERSE
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
INVERSE
HasCoverings : SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
ENTITY IfcStairFlight
NumberOfRiser : OPTIONAL INTEGER;
NumberOfTreads : OPTIONAL INTEGER;
RiserHeight : OPTIONAL IfcPositiveLengthMeasure;
TreadLength : OPTIONAL IfcPositiveLengthMeasure;
PredefinedType : OPTIONAL IfcStairFlightTypeEnum;
END_ENTITY;

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