IFC 4.3.1.0 (IFC4X3_ADD1) development

# 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.

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.

## 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

## 8.15.3.19.7 Formal representation

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