7.8.3.1 IfcFooting

Fundament / Flachgründung
Fondation

A footing is a part of the foundation of a structure that spreads and transmits the load to the soil. A footing is also characterized as shallow foundation, where the loads are transfered to the ground near the surface.

NOTE  Definition according to ISO 6707-1: stepped construction that spreads the load at the foot of a wall or column.
HISTORY  New entity in IFC2x2.
NOTE  Slab foundations, also called slab-on-grade, are not instantiated as IfcFooting but as IfcSlab or as its subtype IfcSlabStandardCase, IfcSlabElementedCase with a predefined type of IfcSlabTypeEnum.BASESLAB. Deep foundations, which transfer the loads to subsurface layers, are represented by IfcPile.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 642.
Type
IfcFootingType

Table 642 — IfcFooting Object Typing



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 643.
PredefinedTypeName
 Pset_FootingCommon
 Pset_ReinforcementBarCountOfIndependentFooting
 Pset_ReinforcementBarPitchOfContinuousFooting
 Pset_ConcreteElementGeneral
 Pset_PrecastConcreteElementFabrication
 Pset_PrecastConcreteElementGeneral
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 643 — IfcFooting Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 644.
Name
Qto_FootingBaseQuantities

Table 644 — IfcFooting Quantity Sets



Material Profile Set Usage

The Material Profile Set Usage concept applies to this entity.



Product Placement

The Product Placement concept applies to this entity as shown in Table 645.
TypeRelativeDescription
IfcLocalPlacementIfcLocalPlacementRelative placement according to position and rotation relative to container.
IfcLocalPlacement Absolute placement according to position and rotation of world coordinate system.
IfcGridPlacement Placement according to grid intersection.

Table 645 — IfcFooting Product Placement



Axis Geometry

The Axis Geometry concept applies to this entity as shown in Table 646.
IdentifierTypeItems
   

Table 646 — IfcFooting Axis Geometry



FootPrint Geometry

The FootPrint Geometry concept applies to this entity as shown in Table 647.
IdentifierTypeItemsDescription
    
FootPrintGeometricCurveSet Any collection of points and curves representing the floor plan projection.
FootPrintAnnotation2D Any collection of points and curves, and additional hatching and text representing the floor plan projection.

Table 647 — IfcFooting FootPrint Geometry



Body Geometry

The Body Geometry concept applies to this entity as shown in Table 648.
IdentifierTypeItems
   

Table 648 — IfcFooting Body Geometry




XSD Specification:

 <xs:element name="IfcFooting" type="ifc:IfcFooting" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
 <xs:complexType name="IfcFooting">
  <xs:complexContent>
   <xs:extension base="ifc:IfcBuildingElement">
    <xs:attribute name="PredefinedType" type="ifc:IfcFootingTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcFooting
SUBTYPE OF IfcBuildingElement;
PredefinedType : OPTIONAL IfcFootingTypeEnum;
WHERE
CorrectPredefinedType : NOT EXISTS(PredefinedType) OR (PredefinedType <> IfcFootingTypeEnum.USERDEFINED) OR ((PredefinedType = IfcFootingTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCSTRUCTURALELEMENTSDOMAIN.IFCFOOTINGTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType)) ;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : The generic type of the footing.
IFC4 CHANGE  Attribute made optional. Type information can be provided by IfcRelDefinesByType and IfcFootingType.

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcFootingType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : If this occurrence is defined by a type object, the latter has to be an IfcFootingType.

Inheritance Graph:

ENTITY IfcFooting
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
INVERSE
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties 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;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
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
INVERSE
HasCoverings : SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
ENTITY IfcFooting
PredefinedType : OPTIONAL IfcFootingTypeEnum;
END_ENTITY;

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