6.3.3.10 IfcMechanicalFastenerType

Mechanisches Befestigungsmittel - Typ

The element component type IfcMechanicalFastenerType defines commonly shared information for occurrences of mechanical fasteners. The set of shared information may include:

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

HISTORY  New entity in IFC2x2
IFC4 CHANGE  Supertype changed from IfcFastenerType to IfcElementComponentType. Attributes PredefinedType, NominalDiameter, NominalLength added.

Classification Use Definition

Mechanical fasteners, especially bolts, are often standardized. To refer to a formal fastener designation according to a standard (a product norm), IfcRelAssociatesClassification together with IfcClassificationReference should be used.

Furthermore, IfcRelAssociatesLibrary together with IfcLibraryReference may be used to refer to a library which contains fastener definitions.


XSD Specification:

 <xs:element name="IfcMechanicalFastenerType" type="ifc:IfcMechanicalFastenerType" substitutionGroup="ifc:IfcElementComponentType" nillable="true"/>
 <xs:complexType name="IfcMechanicalFastenerType">
  <xs:complexContent>
   <xs:extension base="ifc:IfcElementComponentType">
    <xs:attribute name="PredefinedType" type="ifc:IfcMechanicalFastenerTypeEnum" use="optional"/>
    <xs:attribute name="NominalDiameter" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="NominalLength" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcMechanicalFastenerType
SUBTYPE OF IfcElementComponentType;
PredefinedType : IfcMechanicalFastenerTypeEnum;
NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;
NominalLength : OPTIONAL IfcPositiveLengthMeasure;
WHERE
CorrectPredefinedType : (PredefinedType <> IfcMechanicalFastenerTypeEnum.USERDEFINED) OR ((PredefinedType = IfcMechanicalFastenerTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Subtype of mechanical fastener
NominalDiameter : The nominal diameter describing the cross-section size of the fastener type.
NominalLength : The nominal length describing the longitudinal dimensions of the fastener type.

Formal Propositions:

CorrectPredefinedType : The inherited attribute ElementType shall be provided if the PredefinedType is set to USERDEFINED.

Inheritance Graph:

ENTITY IfcMechanicalFastenerType
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 IfcTypeObject
ApplicableOccurrence : OPTIONAL IfcIdentifier;
HasPropertySets : OPTIONAL SET [1:?] OF IfcPropertySetDefinition;
INVERSE
Types : SET [0:1] OF IfcRelDefinesByType FOR RelatingType;
ENTITY IfcTypeProduct
RepresentationMaps : OPTIONAL LIST [1:?] OF UNIQUE IfcRepresentationMap;
Tag : OPTIONAL IfcLabel;
INVERSE
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElementType
ElementType : OPTIONAL IfcLabel;
ENTITY IfcElementComponentType
ENTITY IfcMechanicalFastenerType
PredefinedType : IfcMechanicalFastenerTypeEnum;
NominalDiameter : OPTIONAL IfcPositiveLengthMeasure;
NominalLength : OPTIONAL IfcPositiveLengthMeasure;
END_ENTITY;

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