7.8.3.13 IfcTendon

Spannglied
Cable

A tendon is a steel element such as a wire, cable, bar, rod, or strand used to impart prestress to concrete when the element is tensioned.

NOTE  Definition according to ISO 6707-1: steel bar(s) or groups of bars, strands or wires given a tensile stress that produces a compressive stress in prestressed concrete or masonry.
HISTORY  New entity in IFC2x2.
IFC4 CHANGE  Attribute PredefinedType made optional. NominalDiameter and CrossSectionArea made optional and deprecated; this information can now be provided by IfcTendonType. Description of FrictionCoefficient corrected.

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 667.
Type
IfcTendonType

Table 667 — IfcTendon Object Typing



Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 668.
PredefinedTypeName
 Pset_Condition
 Pset_EnvironmentalImpactIndicators
 Pset_EnvironmentalImpactValues
 Pset_ManufacturerOccurrence
 Pset_ManufacturerTypeInformation
 Pset_PackingInstructions
 Pset_ServiceLife
 Pset_Warranty

Table 668 — IfcTendon Property Sets for Objects



Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 669.
Name
Qto_ReinforcingElementBaseQuantities

Table 669 — IfcTendon Quantity Sets



Product Placement

The Product Placement concept applies to this entity as shown in Table 670.
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 670 — IfcTendon Product Placement



Body Geometry

The Body Geometry concept applies to this entity as shown in Table 671.
IdentifierTypeItems
   

Table 671 — IfcTendon Body Geometry

See supertype IfcElementComponent. This method of representation allows for several tendons represented by a single instance of IfcTendon. The representation map should contain one IfcSweptDiskSolid.




XSD Specification:

 <xs:element name="IfcTendon" type="ifc:IfcTendon" substitutionGroup="ifc:IfcReinforcingElement" nillable="true"/>
 <xs:complexType name="IfcTendon">
  <xs:complexContent>
   <xs:extension base="ifc:IfcReinforcingElement">
    <xs:attribute name="PredefinedType" type="ifc:IfcTendonTypeEnum" use="optional"/>
    <xs:attribute name="NominalDiameter" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="CrossSectionArea" type="ifc:IfcAreaMeasure" use="optional"/>
    <xs:attribute name="TensionForce" type="ifc:IfcForceMeasure" use="optional"/>
    <xs:attribute name="PreStress" type="ifc:IfcPressureMeasure" use="optional"/>
    <xs:attribute name="FrictionCoefficient" type="ifc:IfcNormalisedRatioMeasure" use="optional"/>
    <xs:attribute name="AnchorageSlip" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="MinCurvatureRadius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcTendon
SUBTYPE OF IfcReinforcingElement;
PredefinedType : OPTIONAL IfcTendonTypeEnum;
NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;
CrossSectionArea : OPTIONAL IfcAreaMeasure;
TensionForce : OPTIONAL IfcForceMeasure;
PreStress : OPTIONAL IfcPressureMeasure;
FrictionCoefficient : OPTIONAL IfcNormalisedRatioMeasure;
AnchorageSlip : OPTIONAL IfcPositiveLengthMeasure;
MinCurvatureRadius : OPTIONAL IfcPositiveLengthMeasure;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcTendonTypeEnum.USERDEFINED) OR ((PredefinedType = IfcTendonTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCSTRUCTURALELEMENTSDOMAIN.IFCTENDONTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType)) ;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Predefined generic types for a tendon.
IFC4 CHANGE  Attribute made optional.
NominalDiameter : The nominal diameter defining the cross-section size of the tendon.
IFC4 CHANGE  Attribute made optional and deprecated. Use respective attribute at IfcTendonType instead.
CrossSectionArea : The effective cross-section area of the tendon.
IFC4 CHANGE  Attribute made optional and deprecated. Use respective attribute at IfcTendonType instead.
TensionForce : The maximum allowed tension force that can be applied on the tendon.
PreStress : The prestress to be applied on the tendon.
FrictionCoefficient : The friction coefficient between tendon and tendon sheet while the tendon is unbonded.
AnchorageSlip : The deformation of an anchor or slippage of tendons when the prestressing device is released.
MinCurvatureRadius : The smallest curvature radius calculated on the whole effective length of the tendon where the tension properties are still valid.

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcTendonType 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 IfcTendonType.

Inheritance Graph:

ENTITY IfcTendon
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 IfcElementComponent
ENTITY IfcReinforcingElement
SteelGrade : OPTIONAL IfcLabel;
ENTITY IfcTendon
PredefinedType : OPTIONAL IfcTendonTypeEnum;
NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;
CrossSectionArea : OPTIONAL IfcAreaMeasure;
TensionForce : OPTIONAL IfcForceMeasure;
PreStress : OPTIONAL IfcPressureMeasure;
FrictionCoefficient : OPTIONAL IfcNormalisedRatioMeasure;
AnchorageSlip : OPTIONAL IfcPositiveLengthMeasure;
MinCurvatureRadius : OPTIONAL IfcPositiveLengthMeasure;
END_ENTITY;

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