8.15.3.19 IfcRectangleHollowProfileDef

8.15.3.19.1 Semantic 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.

Figure 8.15.3.19.A illustrates parameters of a rectangular or square hollow profile definition.

Figure 8.15.3.19.A — Rectangle hollow 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.

8.15.3.19.2 Entity inheritance

8.15.3.19.3 Attributes

#	Attribute	Type	Description
IfcProfileDef (4)
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.
	HasExternalReference	SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects	Reference 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 (1)
3	Position	OPTIONAL IfcAxis2Placement2D	Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.
IfcRectangleProfileDef (2)
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.
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IfcRectangleHollowProfileDef (3)
6	WallThickness	IfcPositiveLengthMeasure	Thickness of the material.
7	InnerFilletRadius	OPTIONAL IfcNonNegativeLengthMeasure	Inner corner radius.
8	OuterFilletRadius	OPTIONAL IfcNonNegativeLengthMeasure	Outer corner radius.

Table 8.15.3.19.B

8.15.3.19.4 Formal propositions

Name	Description
ValidInnerRadius	The inner fillet radius (if given) shall be small enough to fit into the void.
`NOT(EXISTS(InnerFilletRadius)) OR ((InnerFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2. - WallThickness)) AND (InnerFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2. - WallThickness)))`
ValidOuterRadius	The outer fillet radius (if given) shall be small enough to fit into the bounding box.
`NOT(EXISTS(OuterFilletRadius)) OR ((OuterFilletRadius <= (SELF\IfcRectangleProfileDef.XDim/2.)) AND (OuterFilletRadius <= (SELF\IfcRectangleProfileDef.YDim/2.)))`
ValidWallThickness	The wall thickness shall be smaller than half of the X and Y dimension of the rectangle.
`(WallThickness < (SELF\IfcRectangleProfileDef.XDim/2.)) AND (WallThickness < (SELF\IfcRectangleProfileDef.YDim/2.))`

Table 8.15.3.19.C

8.15.3.19.5 Property sets

Pset_ProfileMechanical
- MassPerLength
- CrossSectionArea
- Perimeter
- MinimumPlateThickness
- MaximumPlateThickness
- CentreOfGravityInX
- CentreOfGravityInY
- ShearCentreZ
- ShearCentreY
- MomentOfInertiaY
- MomentOfInertiaZ
- MomentOfInertiaYZ
- TorsionalConstantX
- WarpingConstant
- ShearDeformationAreaZ
- ShearDeformationAreaY
- MaximumSectionModulusY
- MinimumSectionModulusY
- MaximumSectionModulusZ
- MinimumSectionModulusZ
- TorsionalSectionModulus
- ShearAreaZ
- ShearAreaY
- PlasticShapeFactorY
- PlasticShapeFactorZ

8.15.3.19.6 Concept usage

Concept	Usage	Description
IfcProfileDef (1)
Property Sets for Profiles	General	This concept can be applied to the following resources: Pset_ProfileMechanical
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Concept

Usage

Description

IfcProfileDef (1)

Property Sets for Profiles

General

This concept can be applied to the following resources:

Pset_ProfileMechanical

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Table 8.15.3.19.D

8.15.3.19.7 Formal representation

ENTITY IfcRectangleHollowProfileDef
 SUBTYPE OF (IfcRectangleProfileDef);
	WallThickness : IfcPositiveLengthMeasure;
	InnerFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
	OuterFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
 WHERE
	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.)));
	ValidWallThickness : (WallThickness < (SELF\IfcRectangleProfileDef.XDim/2.)) AND 
(WallThickness < (SELF\IfcRectangleProfileDef.YDim/2.));
END_ENTITY;

8.15.3.19.8 References

IfcRectangleProfileDef