A ramp comprises a single inclined segment, or several inclined segments that are connected by a horizontal segment, referred to as a landing. A ramp flight is the single inclined segment and part of the ramp construction. In case of single flight ramps, the ramp flight and the ramp are identical. 

An IfcRampFlight is an aggregated part of an IfcRamp realized through the IfcRelAggregates relationship, the ramp flight is therefore included in the set of IfcRelAggregates.RelatedObjects. An IfcRampFlight connects the floor slab of zero to two different storeys (or partial storeys or landings) within a building. The connection relationship between the IfcRampFlight and the IfcSlab can be expressed using the IfcRelConnectsElements relationship. 

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). The image below illustrates the axis representation which has the following constraints:

• In case of straight flights the curve is a single item of type IfcPolyline
• In case of winding flights the curve is a single item of type IfcCompositeCurve
• In case of a curved flight or a spiral flight the curve is a single item of type IfcTrimmedCurve

The following additional constraints apply to the 'SweptSolid' representation type:

• Solid: IfcExtrudedAreaSolid is required
• Profile: IfcRectangleProfileDef and IfcArbitraryClosedProfileDef is supported
• Extrusion: The profile is extruded in any direction relative to the XY plane of the position coordinate system of the IfcExtrudedAreaSolid. Therefore non-perpendicular sweep operation has to be supported. It might be further constrained to be in the direction of the global z-axis in implementers agreements

The image below illustrates the body representation. 

The flight foot print, including the flight boundary is represented by a two-dimensional geometric curve set. The image below illustrates the footprint representation which has the following constraints:

• In case of straight flights the curve set consists of a single item of type IfcPolyline
• In case of winding flights or curved flights the curve set consists of a single item of type IfcCompositeCurve
• In case of a spiral flight the curve set consists of a single item of type IfcConic or IfcPolyline

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

This concept can be applied to the following resources:

• IfcRampFlightType

This concept can be applied to the following resources:

• Pset_ConcreteElementGeneral
• Pset_PrecastConcreteElementFabrication
• Pset_PrecastConcreteElementGeneral
• Pset_RampFlightCommon

This concept can be applied to the following resources:

• Qto_RampFlightBaseQuantities

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

• the Spatial Containment (defined here)
• the Element Composition