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IfcPlateType.md

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IfcPlateType

The element type IfcPlateType defines commonly shared information for occurrences of plates. The set of shared information may include:

  • common properties within shared property sets
  • common material information
  • common material layer definitions
  • common shape representations

It is used to define a plate specification (i.e. the specific product information, that is common to all occurrences of that product type). Plate types may be exchanged without being already assigned to occurrences.

NOTE The product representations are defined as representation maps (at the level of the supertype IfcTypeProduct, which gets assigned by an element occurrence instance through the IfcShapeRepresentation.Item[1] being an IfcMappedItem.

The occurrences of the IfcPlateType within building models are represented by instances of IfcPlate.

HISTORY New entity in IFC2x2.

Informal Propositions

  1. The material assignment, if provided using the IfcRelAssociatesMaterial relationship, shall not reference the IfcMaterialLayerSetUsage. Use IfcMaterialLayerSet instead.

Attributes

PredefinedType

Identifies the predefined types of a planar member element from which the type required may be set.

Formal Propositions

CorrectPredefinedType

The inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.

Concepts

Material Layer Set

The material of the IfcPlateType is defined by the IfcMaterialLayerSet or as fall back by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.

The shared material layer set definition is defined by assigning an IfcMaterialLayerSet (see material use definition above). The IfcMaterialLayer refers to one or several of IfcMaterial that is the common for all plate occurrence, if used. If an IfcMaterialProfileSet is used, all occurrences must have a corresponding IfcMaterialProfileSetUsage.

NOTE  Since each individual instance of IfcPlate defines its own IfcMaterialLayerSetUsage including the offset from the reference plane, the same IfcPlateType can be used independently of the reference plane alignment of its occurrences.

Type Body Geometry