IFC 4.3.x development

8.15.3.19 IfcRectangleHollowProfileDef

Change log

IFC4

additions where_rules ValidInnerRadius
additions where_rules ValidOuterRadius
additions where_rules ValidWallThickness
deletions where_rules WR31
deletions where_rules WR32
deletions where_rules WR33
modificationsattributes InnerFilletRadius definitionChanged from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure
modificationsattributes OuterFilletRadius definitionChanged from IfcPositiveLengthMeasure to IfcNonNegativeLengthMeasure

8.15.3.19.1 Semantic definitions at the entity

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 1 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:

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 1 — Rectangle hollow profile

8.15.3.19.1 Attributes

# Attribute Type Description
IfcProfileDef
1 ProfileType IfcProfileTypeEnum 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.
2 ProfileName OPTIONAL IfcLabel 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_.
HasExternalReferenceSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjectsReference to external information, e.g. library, classification, or document information, which is associated with the profile.

> IFC4 CHANGE New inverse attribute
HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition Additional properties of the profile, for example mechanical properties.

> IFC4 CHANGE New inverse attribute
IfcParameterizedProfileDef
3 Position OPTIONAL IfcAxis2Placement2D Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.
IfcRectangleProfileDef
4 XDim IfcPositiveLengthMeasure The extent of the rectangle in the direction of the x-axis.
5 YDim IfcPositiveLengthMeasure The extent of the rectangle in the direction of the y-axis.
IfcRectangleHollowProfileDef
6 WallThickness IfcPositiveLengthMeasure Thickness of the material.
7 InnerFilletRadius OPTIONAL IfcNonNegativeLengthMeasure Inner corner radius.
8 OuterFilletRadius OPTIONAL IfcNonNegativeLengthMeasure Outer corner radius.

8.15.3.19.2 Entity inheritance

dot_inheritance IfcRectangleHollowProfileDef IfcRectangleHollowProfileDef IfcRectangleProfileDef IfcRectangleProfileDef IfcRectangleHollowProfileDef->IfcRectangleProfileDef IfcRoundedRectangleProfileDef IfcRoundedRectangleProfileDef IfcRoundedRectangleProfileDef->IfcRectangleProfileDef IfcParameterizedProfileDef IfcParameterizedProfileDef IfcRectangleProfileDef->IfcParameterizedProfileDef IfcParameterizedProfileDef_children 10 more... IfcParameterizedProfileDef_children->IfcParameterizedProfileDef IfcProfileDef IfcProfileDef IfcParameterizedProfileDef->IfcProfileDef IfcProfileDef_children 5 more... IfcProfileDef_children->IfcProfileDef

8.15.3.19.3 Definitions applying to General Usage

8.15.3.19.3.1 Property Sets for Objects

PsetName
'Pset_ProfileMechanical'

8.15.3.19.4 Formal representations

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;