IfcTendon

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

HISTORY New entity in IFC Release 2x2

Geometry Use Definitions:

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

Local Placement
The use of local placement is defined at the supertype IfcBuildingElementComponent.

Standard Geometric Representation using Swept Solid Representation
The standard geometric representation of IfcTendon is defined using the swept solid representation. The RepresentationType attribute of IfcShapeRepresentation should have the value 'SweptSolid'. The solid is formed from a cross section approximated as a circular disk swept along any arbitrary curve. Given this, the following constraints apply to the standard representation:

Solid: IfcSweptDiskSolid introduced in IFC Release 2x2 shall be supported.
Profile: The circular disk cross section approximation is defined by the Radius attribute of IfcSweptDiskSolid.
Extrusion: The extrusion along any arbitrary curve is defined by the Directrix attribute of IfcSweptDiskSolid.

Simplified Geometric Representation
Simplified geometric representations may be used based on local agreements.

EXPRESS specification:

ENTITY IfcTendon

SUBTYPE OF (

IfcReinforcingElement);

PredefinedType

IfcTendonTypeEnum;

NominalDiameter

IfcPositiveLengthMeasure;

CrossSectionArea

IfcAreaMeasure;

TensionForce

OPTIONAL IfcForceMeasure;

PreStress

OPTIONAL IfcPressureMeasure;

FrictionCoefficient

OPTIONAL IfcNormalisedRatioMeasure;

AnchorageSlip

OPTIONAL IfcPositiveLengthMeasure;

MinCurvatureRadius

OPTIONAL IfcPositiveLengthMeasure;

WHERE

WR1

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

END_ENTITY;

Attribute definitions:

PredefinedType	:	Predefined generic types for a tendon.
NominalDiameter	:	The nominal diameter defining the cross-section size of the tendon.
CrossSectionArea	:	The effective cross-section area of the tendon.
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 for the bond between the tendon and the surrounding concrete.
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:

WR1

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

Inheritance graph

ENTITY IfcTendon;

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 IfcBuildingElementComponent;

ENTITY IfcReinforcingElement;

SteelGrade

OPTIONAL IfcLabel;

ENTITY IfcTendon;

PredefinedType

IfcTendonTypeEnum;

NominalDiameter

IfcPositiveLengthMeasure;

CrossSectionArea

IfcAreaMeasure;

TensionForce

OPTIONAL IfcForceMeasure;

PreStress

OPTIONAL IfcPressureMeasure;

FrictionCoefficient

OPTIONAL IfcNormalisedRatioMeasure;

AnchorageSlip

OPTIONAL IfcPositiveLengthMeasure;

MinCurvatureRadius

OPTIONAL IfcPositiveLengthMeasure;

END_ENTITY;