IfcFooting

Definition from IAI: A part of the foundation of a structure that spreads and transmits the load directly to the soil.

HISTORY New entity in IFC Release 2x2

Property Set Use Definition:

The property sets relating to the IfcFooting are defined by the IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. It is accessible by the inverse IsDefinedBy relationship. The following property set definitions specific to the IfcFooting are part of this IFC release:

Pset_ReinforcementBarCountOfIndependentFooting: property set for independent IfcFooting occurrences.
Pset_ReinforcementBarPitchOfContinuousFooting: property set for continuous IfcFooting occurrences.

Geometry Use Definitions:

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

Local Placement
The local placement for IfcFooting is defined in its supertype IfcProduct. It is defined by the IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

The PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement, which is used in the ContainedInStructure inverse attribute, or to a spatial structure element at a higher level, referenced by that.
If the relative placement is not used, the absolute placement is defined within the world coordinate system.

Standard Geometric Representation
Provided that it is possible the standard geometric representation of IfcFooting is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The following constraints apply to the standard representation:

Solid: IfcExtrudedAreaSolid shall be supported
Profile: All applicable profile types shall be supported
Extrusion: All extrusion directions shall be supported.

If it is impossible to define the geometry using the swept solid representation the representations defined in its supertype IfcBuildingElement may be used.

EXPRESS specification:

ENTITY IfcFooting

SUBTYPE OF (

IfcBuildingElement);

PredefinedType

IfcFootingTypeEnum;

WHERE

WR1

(PredefinedType <> IfcFootingTypeEnum.USERDEFINED) OR ((PredefinedType = IfcFootingTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType)) ;

END_ENTITY;

Attribute definitions:

PredefinedType

The generic type of the footing.

Formal Propositions:

WR1

The attribute ObjectType shall be given, if the predefined type is set to USERDEFINED.

Inheritance graph

ENTITY IfcFooting;

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 IfcFooting;

PredefinedType

IfcFootingTypeEnum;

END_ENTITY;