Fundament / Flachgründung

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.

Table 642 — IfcFooting Object Typing

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 643.

Table 643 — IfcFooting Property Sets for Objects

Quantity Sets

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

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.
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.

Table 646 — IfcFooting Axis Geometry

FootPrint Geometry

The FootPrint Geometry concept applies to this entity as shown in Table 647.
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.

Table 648 — IfcFooting Body Geometry

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcFooting
SUBTYPE OF IfcBuildingElement;
PredefinedType : OPTIONAL IfcFootingTypeEnum;
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)) ;

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
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
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;
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;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
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
HasCoverings : SET OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
ENTITY IfcFooting
PredefinedType : OPTIONAL IfcFootingTypeEnum;

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