IfcRectangleHollowProfileDef

Natural language names
Rechteckprofil hohl - parametrische Definition
Rectangle Hollow Profile Def
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcRectangleHollowProfileDef
      PositionMODIFIEDInstantiation changed to OPTIONAL.
      InnerFilletRadiusMODIFIEDType changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure.
      OuterFilletRadiusMODIFIEDType changed from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure.
Semantic definitions at the entity
Entity definition

IfcRectangleHollowProfileDef defines a section profile that provides the defining parameters of a rectangular (or square) hollow section to be used by the swept surface geometry or the swept area solid. Its parameters and orientation relative to the position coordinate system are according to the following illustration. A square hollow section can be defined by equal values for h and b. The centre of the position coordinate system is in the profiles centre of the bounding box (for symmetric profiles identical with the centre of gravity). Normally, the longer sides are parallel to the y-axis, the shorter sides parallel to the x-axis.

HISTORY  New entity in IFC2x2.
IFC4 CHANGE  Types of InnerFilletRadius and OuterFilletRadius relaxed to allow for zero values.

Figure 429 illustrates parameters of a rectangular or square hollow profile definition.

hollow rectange shape profile

Position
The parameterized profile defines its own position coordinate system. The underlying coordinate system is defined by the swept area solid that uses the profile definition. It is the xy plane of:

  • IfcSweptAreaSolid.Position

by using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile.

Figure 429 — Rectangle hollow profile

Attribute definitions
#AttributeTypeCardinalityDescription G
6WallThicknessIfcPositiveLengthMeasure Thickness of the material.X
7InnerFilletRadiusIfcNonNegativeLengthMeasure? Inner corner radius.X
8OuterFilletRadiusIfcNonNegativeLengthMeasure? Outer corner radius.X
Formal Propositions
RuleDescription
ValidWallThicknessThe wall thickness shall be smaller than half of the X and Y dimension of the rectangle.
ValidInnerRadiusThe inner fillet radius (if given) shall be small enough to fit into the void.
ValidOuterRadiusThe outer fillet radius (if given) shall be small enough to fit into the bounding box.
Inherited definitions from supertypes
Entity inheritance IfcRectangleProfileDef IfcParameterizedProfileDef IfcProfileDef
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcProfileDef
1ProfileTypeIfcProfileTypeEnum Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid.X
2ProfileNameIfcLabel? Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference. X
HasExternalReferenceIfcExternalReferenceRelationship
@RelatedResourceObjects
S[0:?]Reference to external information, e.g. library, classification, or document information, which is associated with the profile.
IFC4 CHANGE New inverse attribute
X
HasPropertiesIfcProfileProperties
@ProfileDefinition
S[0:?]Additional properties of the profile, for example mechanical properties.
IFC4 CHANGE New inverse attribute
X
IfcParameterizedProfileDef
3PositionIfcAxis2Placement2D? Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied. X
IfcRectangleProfileDef
4XDimIfcPositiveLengthMeasure The extent of the rectangle in the direction of the x-axis.X
5YDimIfcPositiveLengthMeasure The extent of the rectangle in the direction of the y-axis.X
IfcRectangleHollowProfileDef
6WallThicknessIfcPositiveLengthMeasure Thickness of the material.X
7InnerFilletRadiusIfcNonNegativeLengthMeasure? Inner corner radius.X
8OuterFilletRadiusIfcNonNegativeLengthMeasure? Outer corner radius.X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcProfileDef
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRectangleHollowProfileDef" type="ifc:IfcRectangleHollowProfileDef" substitutionGroup="ifc:IfcRectangleProfileDef" nillable="true"/>
 <xs:complexType name="IfcRectangleHollowProfileDef">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRectangleProfileDef">
    <xs:attribute name="WallThickness" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="InnerFilletRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
    <xs:attribute name="OuterFilletRadius" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRectangleHollowProfileDef
 SUBTYPE OF (IfcRectangleProfileDef);
  WallThickness : IfcPositiveLengthMeasure;
  InnerFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
  OuterFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
 WHERE
  ValidWallThickness : (WallThickness < (SELF\IfcRectangleProfileDef.XDim/2.)) AND
(WallThickness < (SELF\IfcRectangleProfileDef.YDim/2.));
  ValidInnerRadius : NOT(EXISTS(InnerFilletRadius)) OR
((InnerFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2. - WallThickness)) AND
(InnerFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2. - WallThickness)))
;
  ValidOuterRadius : NOT(EXISTS(OuterFilletRadius)) OR
((OuterFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND
(OuterFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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