IfcReinforcingBarType

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcReinforcingBarType			ADDED

Semantic definitions at the entity

Entity definition

The reinforcing element type IfcReinforcingBarType defines commonly shared information for occurrences of reinforcing bars. The set of shared information may include:

common properties with shared property sets
common representations
common materials
common composition of elements

It is used to define a reinforcing bar type specification indicating the specific product information that is common to all occurrences of that product type. The IfcReinforcingBarType may be declared within IfcProject or IfcProjectLibrary using IfcRelDeclares and may be exchanged with or without occurrences of the type. Occurrences of IfcReinforcingBarType are represented by instances of IfcReinforcingBar.

HISTORY New entity in IFC4.

Attribute definitions

#	Attribute	Type	Cardinality	Description	B
10	PredefinedType	IfcReinforcingBarTypeEnum	[1:1]	Subtype of reinforcing bar.	X
11	NominalDiameter	IfcPositiveLengthMeasure	[0:1]	The nominal diameter defining the cross-section size of the reinforcing bar.	X
12	CrossSectionArea	IfcAreaMeasure	[0:1]	The effective cross-section area of the reinforcing bar.	X
13	BarLength	IfcPositiveLengthMeasure	[0:1]	The total length of the reinforcing bar. The total length of bended bars are calculated according to local standards with corrections for the bends.	X
14	BarSurface	IfcReinforcingBarSurfaceEnum	[0:1]	Indicator for whether the bar surface is plain or textured.	X
15	BendingShapeCode	IfcLabel	[0:1]	Shape code per a standard like ACI 315, ISO 3766, or a similar standard. It is presumed that a single standard for defining the bar bending is used throughout the project and that this standard is referenced from the IfcProject object through the IfcDocumentReference mechanism.	X
16	BendingParameters	IfcBendingParameterSelect	L[1:?]	Bending shape parameters. Their meaning is defined by the bending shape code and the respective standard.	X

Formal Propositions

Rule	Description
CorrectPredefinedType	The inherited attribute ElementType shall be provided if the PredefinedType is set to USERDEFINED.
BendingShapeCodeProvided	Bending parameters must be accompanied by a shape code.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	B
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[0:1]	Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object, NOTE only the last modification in stored - either as addition, deletion or modification.	X
3	Name	IfcLabel	[0:1]	Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.	X
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @RelatedObjects	S[0:?]	Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.	X
	Nests	IfcRelNests @RelatedObjects	S[0:1]	References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).
	IsNestedBy	IfcRelNests @RelatingObject	S[0:?]	References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).	X
	HasContext	IfcRelDeclares @RelatedDefinitions	S[0:1]	References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.
	IsDecomposedBy	IfcRelAggregates @RelatingObject	S[0:?]	References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).	X
	Decomposes	IfcRelAggregates @RelatedObjects	S[0:1]	References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).	X
	HasAssociations	IfcRelAssociates @RelatedObjects	S[0:?]	Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.	X
IfcTypeObject
5	ApplicableOccurrence	-		This attribute is out of scope for this model view definition and shall not be set.
6	HasPropertySets	IfcPropertySetDefinition	S[1:?]	Set ~~list~~ of unique property sets, that are associated with the object type and are common to all object occurrences referring to this object type.	X
	Types	IfcRelDefinesByType @RelatingType	S[0:1]	Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type.
IfcTypeProduct
7	RepresentationMaps	IfcRepresentationMap	~L[1:?]	List of unique representation maps. Each representation map describes a block definition of the shape of the product style. By providing more than one representation map, a multi-view block definition can be given.	X
8	Tag	-		This attribute is out of scope for this model view definition and shall not be set.
	ReferencedBy	IfcRelAssignsToProduct @RelatingProduct	S[0:?]	Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product type.
IfcElementType
9	ElementType	-		This attribute is out of scope for this model view definition and shall not be set.
IfcElementComponentType
IfcReinforcingElementType
IfcReinforcingBarType
10	PredefinedType	IfcReinforcingBarTypeEnum	[1:1]	Subtype of reinforcing bar.	X
11	NominalDiameter	IfcPositiveLengthMeasure	[0:1]	The nominal diameter defining the cross-section size of the reinforcing bar.	X
12	CrossSectionArea	IfcAreaMeasure	[0:1]	The effective cross-section area of the reinforcing bar.	X
13	BarLength	IfcPositiveLengthMeasure	[0:1]	The total length of the reinforcing bar. The total length of bended bars are calculated according to local standards with corrections for the bends.	X
14	BarSurface	IfcReinforcingBarSurfaceEnum	[0:1]	Indicator for whether the bar surface is plain or textured.	X
15	BendingShapeCode	IfcLabel	[0:1]	Shape code per a standard like ACI 315, ISO 3766, or a similar standard. It is presumed that a single standard for defining the bar bending is used throughout the project and that this standard is referenced from the IfcProject object through the IfcDocumentReference mechanism.	X
16	BendingParameters	IfcBendingParameterSelect	L[1:?]	Bending shape parameters. Their meaning is defined by the bending shape code and the respective standard.	X

Definitions applying to Bridge View

Instance diagram

This entity may be used to capture rebar sizes and bending shapes either parametrically or of fixed dimension.

For parametric definitions, the rebar size and/or material may be specified using a material profile set. If no material profile set is provided, then such information may be configurable by downstream usage of the definition (either a derived definition or an occurrence).

For bending shapes such as for stirrups or ties, the geometry may be defined using a polygonal swept disk, where a polyline indicates the transition points, and a fillet radius indicates how the rebar is to be bent at each transition point.

For implicit parametric definitions of bending parameters, the BendingShapeCode and BendingParameters may be provided, where applications rely on their own database (ACI 318 in the United States) to interpret the code and parameters.

For explicit parametric definitions, constraints may be used to link the shape geometry of the swept disk solid to input parameters.

Concept usage

Material Profile Set

The Material Profile Set concept applies to this entity.

The rebar cross-section and material properties are indicated within a material profile set consisting of a single IfcMaterialProfile having cross-section defined by IfcCircleProfileDef.

Exchange
Import	O	O
Export	O	O

Type Body SweptDisk Geometry

The Type Body SweptDisk Geometry concept applies to this entity.

The resulting geometry describing the rebar bending is defined using IfcSweptDiskSolidPolygonal, indicating points along with a bending radius.

Exchange
Import	R	R
Export	R	R

Constraint Association

The Constraint Association concept applies to this entity.

To indicate formulas for applying bending parameters to geometry, constraints may optionally be defined, where the X and Y coordinates of points along the IfcSweptDiskSolidPolygonal may be defined relative to bending parameters.

Exchange
Import	O	O
Export	O	O

Reinforcing Bar Type Attributes

The Reinforcing Bar Type Attributes concept applies to this entity.

Parameters may be captured for driving underlying material profiles and geometry. Applications may use such parameters to either look up bending shapes according to external specification (such as ACI), or explicitly apply such parameters according to formulas defined by constraints.

Exchange
Import	R	R
Export	R	R

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Bridge View
	User Identity	Bridge View
	Object Ownership	Bridge View
IfcTypeObject
	Property Sets for Types	Bridge View
IfcReinforcingBarType
	Material Profile Set	Bridge View
	Type Body SweptDisk Geometry	Bridge View
	Constraint Association	Bridge View
	Reinforcing Bar Type Attributes	Bridge View

Formal representations

XSD Specification

 <xs:element name="IfcReinforcingBarType" type="ifc:IfcReinforcingBarType" substitutionGroup="ifc:IfcReinforcingElementType" nillable="true"/>

 <xs:complexType name="IfcReinforcingBarType">

  <xs:complexContent>

   <xs:extension base="ifc:IfcReinforcingElementType">

    <xs:sequence>

     <xs:element name="BendingParameters" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcBendingParameterSelect" maxOccurs="unbounded"/>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcBendingParameterSelect"/>

       <xs:attribute ref="ifc:cType" fixed="list"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

    <xs:attribute name="PredefinedType" type="ifc:IfcReinforcingBarTypeEnum" use="optional"/>

    <xs:attribute name="NominalDiameter" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="CrossSectionArea" type="ifc:IfcAreaMeasure" use="optional"/>

    <xs:attribute name="BarLength" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="BarSurface" type="ifc:IfcReinforcingBarSurfaceEnum" use="optional"/>

    <xs:attribute name="BendingShapeCode" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcReinforcingBarType

 SUBTYPE OF (IfcReinforcingElementType);

  PredefinedType : IfcReinforcingBarTypeEnum;

  NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;

  CrossSectionArea : OPTIONAL IfcAreaMeasure;

  BarLength : OPTIONAL IfcPositiveLengthMeasure;

  BarSurface : OPTIONAL IfcReinforcingBarSurfaceEnum;

  BendingShapeCode : OPTIONAL IfcLabel;

  BendingParameters : OPTIONAL LIST [1:?] OF IfcBendingParameterSelect;

 WHERE

  CorrectPredefinedType : (PredefinedType <> IfcReinforcingBarTypeEnum.USERDEFINED) OR
((PredefinedType = IfcReinforcingBarTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
  BendingShapeCodeProvided : NOT EXISTS(BendingParameters) OR EXISTS(BendingShapeCode);
END_ENTITY;

 EXPRESS-G diagram

Link to this page

	Bewehrungsstab - Typ
	Reinforcing Bar Type
	Type de barre d'armature