IFC (IFC4X3_ADD2) under development IfcRectangleHollowProfileDef 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 illustrates parameters of a rectangular or square hollow profile definition.

hollow rectangle shape profile
Figure — Rectangle hollow profile


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. Entity inheritance 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.

HasProperties SET [0:?] OF IfcProfileProperties FOR ProfileDefinition

Additional properties of the profile, for example mechanical properties.

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 Formal propositions

Name Description

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)))

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.)))

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 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 Concept usage

Concept Usage Description
IfcProfileDef (1)
Property Sets for Profiles General

This concept can be applied to the following resources:

Click to show 1 hidden inherited concepts Click to hide 1 inherited concepts
Table Formal representation

ENTITY IfcRectangleHollowProfileDef
 SUBTYPE OF (IfcRectangleProfileDef);
	WallThickness : IfcPositiveLengthMeasure;
	InnerFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
	OuterFilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
	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; References

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