6.1.2.15 IfcRampTypeEnum

This enumeration defines the basic configuration of the ramp type in terms of the number and shape of ramp flights, as shown in Figure 157. The type also distinguished turns by landings. In addition the subdivision of the straight and changing direction ramps is included. The ramp configurations are given for ramps without and with one and two landings.

Ramps which are subdivided into more than two landings, or ramps with non-regular shapes are to be defined with type being USERDEFINED or NOTDEFINED.

HISTORY  New enumeration in IFC2.0.

Enumerated Item Definitions:

Enumerator Description Figure
StraightRunRamp A ramp - which is a sloping floor, walk, or roadway - connecting two levels. The straight ramp consists of one straight flight without turns or winders.
TwoStraightRunRamp A straight ramp consisting of two straight flights without turns but with one landing.
QuarterTurnRamp A ramp making a 90° turn, consisting of two straight flights connected by a quarterspace landing. The direction of the turn is determined by the walking line.
TwoQuarterTurnRamp A ramp making a 180° turn, consisting of three straight flights connected by two quarterspace landings. The direction of the turn is determined by the walking line.
HalfTurnRamp A ramp making a 180° turn, consisting of two straight flights connected by a halfspace landing. The orientation of the turn is determined by the walking line.
SpiralRamp A ramp constructed around a circular or elliptical well without newels and landings.
UserDefined Free form ramp (user defined operation type)  
NotDefined    

Figure 157 — Ramp types

XSD Specification:

 <xs:simpleType name="IfcRampTypeEnum">
  <xs:restriction base="xs:string">
   <xs:enumeration value="straight_run_ramp"/>
   <xs:enumeration value="two_straight_run_ramp"/>
   <xs:enumeration value="quarter_turn_ramp"/>
   <xs:enumeration value="two_quarter_turn_ramp"/>
   <xs:enumeration value="half_turn_ramp"/>
   <xs:enumeration value="spiral_ramp"/>
   <xs:enumeration value="userdefined"/>
   <xs:enumeration value="notdefined"/>
  </xs:restriction>
 </xs:simpleType>

EXPRESS Specification:

TYPE IfcRampTypeEnum = ENUMERATION OF (
STRAIGHT_RUN_RAMP,
TWO_STRAIGHT_RUN_RAMP,
QUARTER_TURN_RAMP,
TWO_QUARTER_TURN_RAMP,
HALF_TURN_RAMP,
SPIRAL_RAMP,
USERDEFINED,
NOTDEFINED);
END_TYPE;

Link to EXPRESS-G diagram EXPRESS-G diagram

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