8.15.3.12 IfcIShapeProfileDef
8.15.3.12.1 Semantic definition
IfcIShapeProfileDef defines a section profile that provides the defining parameters of an 'I' or 'H' section. The I-shape profile has values for its overall depth, width and its web and flange thicknesses. Additionally a fillet radius, flange edge radius, and flange slope may be given. This profile definition represents an I-section which is symmetrical about its major and minor axes; top and bottom flanges are equal and centred on the web.
Figure 8.15.3.12.B illustrates parameters of the I-shape profile definition.
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. Explicit coordinate offsets are used to define cardinal points (e.g. upper-left bound).
Parameter
The parameterized profile is defined by a set of parameter attributes, see attribute definition below.
Position
The profile is inserted into the underlying coordinate system of the swept area solid by using the Position attribute. In this example (cardinal point of lower left corner) the attribute values of IfcAxis2Placement2D are:
Location = IfcCartesianPoint(<1/2 OverallWidth>,<1/2 OverallDepth>)
RefDirection = NIL (defaults to 1.,0.)
Parameter If the FilletRadius is given, it is equally applied to all four corners created by the web and flanges.
8.15.3.12.2 Entity inheritance
8.15.3.12.3 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. |
|
| 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. |
| Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes | |||
| IfcIShapeProfileDef (7) | |||
| 4 | OverallWidth | IfcPositiveLengthMeasure |
Total extent of the width, defined parallel to the x axis of the position coordinate system. |
| 5 | OverallDepth | IfcPositiveLengthMeasure |
Total extent of the depth, defined parallel to the y axis of the position coordinate system. |
| 6 | WebThickness | IfcPositiveLengthMeasure |
Thickness of the web of the I-shape. The web is centred on the x-axis and the y-axis of the position coordinate system. |
| 7 | FlangeThickness | IfcPositiveLengthMeasure |
Flange thickness of the I-shape. Both, the upper and the lower flanges have the same thickness and they are centred on the y-axis of the position coordinate system. |
| 8 | FilletRadius | OPTIONAL IfcNonNegativeLengthMeasure |
The fillet between the web and the flange. 0 if sharp-edged, omitted if unknown. |
| 9 | FlangeEdgeRadius | OPTIONAL IfcNonNegativeLengthMeasure |
Radius of the lower edges of the top flange and the upper edges of the bottom flange. 0 if sharp-edged, omitted if unknown. |
| 10 | FlangeSlope | OPTIONAL IfcPlaneAngleMeasure |
Slope of the lower faces of the top flange and of the upper faces of the bottom flange. Non-zero in case of tapered flanges, 0 in case of parallel flanges, omitted if unknown. |
8.15.3.12.4 Formal propositions
| Name | Description |
|---|---|
| ValidFilletRadius |
The FilletRadius, if given, shall be within the range of allowed values. |
|
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| ValidFlangeThickness |
The sum of flange thicknesses shall be less than the overall depth. |
|
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| ValidWebThickness |
The web thickness shall be less then the flange width. |
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8.15.3.12.5 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
8.15.3.12.6 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 | |||
8.15.3.12.7 Formal representation
ENTITY IfcIShapeProfileDef
SUBTYPE OF (IfcParameterizedProfileDef);
OverallWidth : IfcPositiveLengthMeasure;
OverallDepth : IfcPositiveLengthMeasure;
WebThickness : IfcPositiveLengthMeasure;
FlangeThickness : IfcPositiveLengthMeasure;
FilletRadius : OPTIONAL IfcNonNegativeLengthMeasure;
FlangeEdgeRadius : OPTIONAL IfcNonNegativeLengthMeasure;
FlangeSlope : OPTIONAL IfcPlaneAngleMeasure;
WHERE
ValidFilletRadius : NOT(EXISTS(FilletRadius)) OR
((FilletRadius <= (OverallWidth - WebThickness)/2.) AND
(FilletRadius <= (OverallDepth - (2. * FlangeThickness))/2.));
ValidFlangeThickness : (2. * FlangeThickness) < OverallDepth;
ValidWebThickness : WebThickness < OverallWidth;
END_ENTITY;