# 8.15.3.2 IfcArbitraryOpenProfileDef

## 8.15.3.2.1 Semantic definition

The open profile IfcArbitraryOpenProfileDef defines an arbitrary two-dimensional open profile for the use within the swept surface geometry. It is given by an open boundary from which the surface can be constructed.

Informal Propositions

1. The Curve has to be an open curve.

Figure 8.15.3.2.A illustrates the arbitrary open profile definition. The Curve is defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface that uses the profile definition. It is the xy plane of:

The Curve attribute defines a two dimensional open bounded curve.

## 8.15.3.2.5 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

## 8.15.3.2.7 Formal representation

ENTITY IfcArbitraryOpenProfileDef
SUPERTYPE OF (ONEOF
(IfcCenterLineProfileDef))
SUBTYPE OF (IfcProfileDef);
Curve : IfcBoundedCurve;
WHERE
WR11 : ('IFC4X3_DEV_4b16bd1.IFCCENTERLINEPROFILEDEF' IN TYPEOF(SELF)) OR
(SELF\IfcProfileDef.ProfileType = IfcProfileTypeEnum.CURVE);
WR12 : Curve.Dim = 2;
END_ENTITY;