Navigation
Navigate Navigate Navigate Navigate Navigate Navigate Navigate Navigate

IfcWallStandardCase

Definition from buildingSMART: The standard wall (IfcWallStandardCase) defines a wall with certain constraints for the provision of parameter and with certain constraints for the geometric representation. The IfcWallStandardCase handles all cases of walls, that have a single thickness along the path, i.e.:

The following parameter shall be given:

The material of the wall is defined by the IfcMaterialLayerSetUsage and attached by the IfcRelAssociatesMaterial. It is accessibly by the inverse HasAssociations relationship. The material layer set has to be given (enforced by where rule).

HISTORY New entity in IFC Release 2x.

Property Set Use Definition:

The property sets relating to the IfcWallStandardCase are defined at the supertype IfcWall.

Quantity Use Definition:

The quantities relating to the IfcWallStandardCase are defined at the supertype IfcWall.

Geometry Use Definitions:

The geometric representation of IfcWallStandardCase is given by the IfcProductDefinitionShape, allowing multiple geometric representation. Included are:

Local Placement

The use of local placement is defined at the supertype IfcWall.

Geometric Representation

The standard geometric representation of IfcWallStandardCase is defined using the following multiple shape representations for its definition:

First representation: Curve2D representation of wall axis

The wall axis is represented by a two-dimensional open curve within a particular shape representation. The wall axis is used to apply the parameter to the wall geometry. The following attribute values shall be used

IfcShapeRepresentation shall have the following values:

straight wall axis

In case of a straight wall, the set of items shall include a single geometric representation item of type IfcPolyline or IfcTrimmedCurve with the BasisCurve being an IfcLine.

curved wall axis

In case of a curved wall, the set of items shall include a single geometric representation item of type IfcTrimmedCurve. The curve shall have a BasisCurve of type IfcCircle.

Second representation: SweptSolid or Clipping representation of wall body

The body of the IfcWallStandardCase is defined by using 'SweptSolid' representation for walls without clippings or 'Clipping' representation for walls with clippings (e.g. under sloped roof slabs).

IfcShapeRepresentation shall have the following values:

SweptSolid representation

The standard geometric representation (for body) of IfcWallStandardCase is defined using the 'SweptSolid' representation. The following additional constraints apply to the swept solid representation:

straight wall body

The profile of a wall is described in the ground view and extruded vertically. The profile (also identical with the foot print of the wall) is defined by the IfcArbitraryClosedProfileDef (excluding its subtypes). The profile is given with all wall connections already resolved.

  • In case of a straight wall the two sides of the profile shall be parallel to the wall axis, i.e. the wall has a single unchanged thickness.
curved wall body
  • In case of a curved wall the two sides of the profile shall be parallel (with defined offset) to the wall axis, i.e. the wall has a single unchanged thickness.

The advanced geometric representation (for body) of IfcWallStandardCase is defined using the 'Clipping' representation. The following additional constraints apply to the swept solid representation:

straight wall clipping

Example of clipping using an IfcPolygonalBoundedHalfSpace as SecondOperand in the IfcBooleanClippingResult.

curved wall clipping

Example of clipping using an IfcHalfSpaceSolid as SecondOperand in the IfcBooleanClippingResult.

EXPRESS specification:

ENTITY IfcWallStandardCase
SUBTYPE OF ( IfcWall);
WHERE
WR1  :  SIZEOF (QUERY(temp <* USEDIN(SELF, 'IFCKERNEL.IFCRELASSOCIATES.RELATEDOBJECTS') | ('IFCPRODUCTEXTENSION.IFCRELASSOCIATESMATERIAL' IN TYPEOF(temp)) AND ('IFCMATERIALRESOURCE.IFCMATERIALLAYERSETUSAGE' IN TYPEOF(temp.RelatingMaterial)) )) = 1;
END_ENTITY;

Formal Propositions:

WR1  :  The IfcWallStandard relies on the provision of an IfcMaterialLayerSetUsage.

Inheritance graph

ENTITY IfcWallStandardCase;
ENTITY IfcRoot;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcObjectDefinition;
INVERSE
HasAssignments  :  SET OF IfcRelAssigns FOR RelatedObjects;
IsDecomposedBy  :  SET OF IfcRelDecomposes FOR RelatingObject;
Decomposes  :  SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;
HasAssociations  :  SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject;
ObjectType  :  OPTIONAL IfcLabel;
INVERSE
IsDefinedBy  :  SET OF IfcRelDefines FOR RelatedObjects;
ENTITY IfcProduct;
ObjectPlacement  :  OPTIONAL IfcObjectPlacement;
Representation  :  OPTIONAL IfcProductRepresentation;
INVERSE
ReferencedBy  :  SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement;
Tag  :  OPTIONAL IfcIdentifier;
INVERSE
FillsVoids  :  SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo  :  SET OF IfcRelConnectsElements FOR RelatingElement;
HasCoverings  :  SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
HasProjections  :  SET OF IfcRelProjectsElement FOR RelatingElement;
HasStructuralMember  :  SET OF IfcRelConnectsStructuralElement FOR RelatingElement;
ReferencedInStructures  :  SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasPorts  :  SET OF IfcRelConnectsPortToElement FOR RelatedElement;
HasOpenings  :  SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization  :  SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries  :  SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom  :  SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure  :  SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcBuildingElement;
ENTITY IfcWall;
ENTITY IfcWallStandardCase;
END_ENTITY;