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IfcStairFlight

Definition from buildingSMART: 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 this object. A winder is regarded as part of a stair flight.

An IfcStairFlight is normally aggregated by a stair (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) within a building. The connection relationship between the IfcStairFlight and the IfcSlab is expressed using the IfcRelConnectsElements relationship.

HISTORY: New Entity in IFC Release 2.0.

Property Set Use Definition:

The property sets relating to the IfcStairFlight are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcStairFlight are part of this IFC release:

Geometry Use Definitions:

The geometric representation of IfcStairFlight is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Included are:

Local placement

The local placement for IfcStairFlight is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

Standard Geometric Representation

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

First Representation: WalkingLine

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

walking line IfcShapeRepresentation
RepresentationIdentifier : 'WalkingLine'
RepresentationType : 'GeometricSet'
  • In case of straight flights the curve set shall consists of a single item of type IfcPolyline.
  • In case of winding flights the curve set shall consists of a single item of type IfcCompositeCurve.
  • In case of a curved flight or a spiral flight the curve set shall consists of a single item of type IfcTrimmedCurve.

Second Representation: Boundary

The flight boundary is represented by a two-dimensional closed curve within a particular shape representation.

boundary IfcShapeRepresentation
RepresentationIdentifier : 'Boundary'
RepresentationType : 'GeometricSet'
  • In case of straight flights the curve set shall consists of a single item of type IfcPolyline.
  • In case of winding flights or curved flights the curve set shall consists of a single item of type IfcCompositeCurve.
  • In case of a spiral flight the curve set shall consists of a single item of type IfcConic or IfcPolyline.

Third Representation: Body

The three dimensional shape of the flight is represented by a Brep representation.

3D IfcShapeRepresentation
RepresentationIdentifier : 'Body'
RepresentationType : 'Brep'

EXPRESS specification:

ENTITY IfcStairFlight
SUBTYPE OF ( IfcBuildingElement);
NumberOfRiser  :  OPTIONAL INTEGER;
NumberOfTreads  :  OPTIONAL INTEGER;
RiserHeight  :  OPTIONAL IfcPositiveLengthMeasure;
TreadLength  :  OPTIONAL IfcPositiveLengthMeasure;
END_ENTITY;

Attribute definitions:

NumberOfRiser  :  Number of the risers included in the stair flight.
NumberOfTreads  :  Number of treads included in the stair flight.
RiserHeight  :  Vertical distance from tread to tread. The riser height is supposed to be equal for all stairs in a stair flight.
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.

Inheritance graph

ENTITY IfcStairFlight;
ENTITY IfcRoot;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcObjectDefinition;
INVERSE
HasAssignments  :  SET OF IfcRelAssigns FOR RelatedObjects;
IsDecomposedBy  :  SET OF IfcRelDecomposes FOR RelatingObject;
Decomposes  :  SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;
HasAssociations  :  SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject;
ObjectType  :  OPTIONAL IfcLabel;
INVERSE
IsDefinedBy  :  SET OF IfcRelDefines FOR RelatedObjects;
ENTITY IfcProduct;
ObjectPlacement  :  OPTIONAL IfcObjectPlacement;
Representation  :  OPTIONAL IfcProductRepresentation;
INVERSE
ReferencedBy  :  SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement;
Tag  :  OPTIONAL IfcIdentifier;
INVERSE
HasStructuralMember  :  SET OF IfcRelConnectsStructuralElement FOR RelatingElement;
FillsVoids  :  SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo  :  SET OF IfcRelConnectsElements FOR RelatingElement;
HasCoverings  :  SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
HasProjections  :  SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures  :  SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasPorts  :  SET OF IfcRelConnectsPortToElement FOR RelatedElement;
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;
ENTITY IfcStairFlight;
NumberOfRiser  :  OPTIONAL INTEGER;
NumberOfTreads  :  OPTIONAL INTEGER;
RiserHeight  :  OPTIONAL IfcPositiveLengthMeasure;
TreadLength  :  OPTIONAL IfcPositiveLengthMeasure;
END_ENTITY;