Skip to content

Latest commit

 

History

History
58 lines (37 loc) · 2.38 KB

IfcWallType.md

File metadata and controls

58 lines (37 loc) · 2.38 KB
Raw

IfcWallType

The element type IfcWallType defines commonly shared information for occurrences of walls. 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 wall specification (i.e. the specific product information, that is common to all occurrences of that product type). Wall 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.

Occurrences of the IfcWallType within building models are represented by instances of IfcWall. Occurrences of the IfcWallType within structural analysis models are represented by instances of IfcStructuralSurfaceMember, or its applicable subtypes.

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 wall 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 IfcWallType 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 IfcMaterialLayer that is the common for all wall occurrence, if used. If an IfcMaterialProfileSet is used, all occurrences must have a corresponding IfcMaterialProfileSetUsage.

NOTE  Since each individual instance of IfcWall defines its own IfcMaterialLayerSetUsage including the offset from the wall axis, the same IfcWallType can be used independently of the axis alignment of its occurrences.

Type Body Geometry