IfcStructuralCurveMemberVarying

Natural language names
Stab / Balken mit veränderlichem Profil/Querschnitt
Structural Curve Member Varying
Change log
ItemSPFXMLChangeDescription
4.0.0.0
    IfcStructuralCurveMemberVarying
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      PredefinedTypeMODIFIEDType changed from IfcStructuralCurveTypeEnum to IfcStructuralCurveMemberTypeEnum.
      AxisADDED
Semantic definitions at the entity
Entity definition

This entity describes edge members with varying profile properties. Each instance of IfcStructuralCurveMemberVarying is composed of two or more instances of IfcStructuralCurveMember with differing profile properties. These subordinate members relate to the instance of IfcStructuralCurveMemberVarying by IfcRelAggregates.

NOTE  A curve member whose variation of profile properties can be sufficiently described by a start profile and an end profile (e.g. tapers) shall be modeled as a single direct instance of the supertype IfcStructuralCurveMember.
NOTE  It is recommended that structural activities (actions or reactions) are not connected with aggregated IfcStructuralCurveMemberVarying but only with the IfcStructuralCurveMembers in the aggregation. That way, difficulties in interpretation of local coordinates are avoided.
HISTORY  New entity in IFC2x2.
IFC4 CHANGE  Use definition changed.

Coordinate Systems:

See definitions at IfcStructuralItem and IfcStructuralCurveMember. The local coordinates of the aggregate are derived from those of its parts. Length measures in local x direction of the aggregate depend on continuity and lengths of the parts. The Axis of the aggregate shal be the same as the Axis of the part at the start of the aggregate.

Material Use Definition

Only the individual parts (direct instances of IfcStructuralCurveMember) carry material and profile information.

Inherited definitions from supertypes
Entity inheritance IfcStructuralCurveMember IfcStructuralMember IfcStructuralItem IfcProduct IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcObjectDefinition
HasAssignmentsIfcRelAssigns
@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
NestsIfcRelNests
@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).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.
X
IsNestedByIfcRelNests
@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).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.
X
HasContextIfcRelDeclares
@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.
IFC4 CHANGE  The inverse attribute datatype has been added.
X
IsDecomposedByIfcRelAggregates
@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).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
DecomposesIfcRelAggregates
@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).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
HasAssociationsIfcRelAssociates
@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
IfcObject
5ObjectTypeIfcLabel? The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.
X
IsDeclaredByIfcRelDefinesByObject
@RelatedObjects
S[0:1]Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
X
DeclaresIfcRelDefinesByObject
@RelatingObject
S[0:?]Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.
IFC4 CHANGE  New inverse relationship, change made with upward compatibility for file based exchange.
X
IsTypedByIfcRelDefinesByType
@RelatedObjects
S[0:1]Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.
IFC4 CHANGE  New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.
X
IsDefinedByIfcRelDefinesByProperties
@RelatedObjects
S[0:?]Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.
IFC4 CHANGE  The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.
X
IfcProduct
6ObjectPlacementIfcObjectPlacement? Placement of the product in space, the placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system.X
7RepresentationIfcProductRepresentation? Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement.X
ReferencedByIfcRelAssignsToProduct
@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.X
IfcStructuralItem
AssignedStructuralActivityIfcRelConnectsStructuralActivity
@RelatingElement
S[0:?]Inverse relationship to all structural activities (i.e. to actions or reactions) which are assigned to this structural member.X
IfcStructuralMember
ConnectedByIfcRelConnectsStructuralMember
@RelatingStructuralMember
S[0:?]Inverse relationship to all structural connections (i.e. to supports or connecting elements) which are defined for this structural member.X
IfcStructuralCurveMember
8PredefinedTypeIfcStructuralCurveMemberTypeEnum Type of member with respect to its load carrying behavior in this analysis idealization.X
9AxisIfcDirection Direction which is used in the definition of the local z axis. Axis is specified relative to the so-called global coordinate system, i.e. the SELF\IfcProduct.ObjectPlacement.
NOTE  It is desirable and usually possible that many instances of IfcStructuralCurveConnection and IfcStructuralCurveMember share a common instance of IfcDirection as their Axis attribute.
X
IfcStructuralCurveMemberVarying
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcObjectDefinition
Classification AssociationClassificationGeneral Usage
IfcObject
Object User IdentityObject User IdentityGeneral Usage
Object Predefined TypeObject Predefined TypeGeneral Usage
Object TypingObject TypingGeneral Usage
Property Sets for ObjectsProperty Sets for ObjectsGeneral Usage
Property Sets with OverrideProperty Sets with OverrideGeneral Usage
IfcProduct
Product PlacementProduct PlacementGeneral Usage
Product Geometric RepresentationProduct Geometric RepresentationGeneral Usage
IfcStructuralCurveMember
Structural ConnectivityStructural ConnectivityGeneral Usage
Material Profile Set UsageMaterial Profile Set UsageGeneral Usage
Reference TopologyReference TopologyGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcStructuralCurveMemberVarying" type="ifc:IfcStructuralCurveMemberVarying" substitutionGroup="ifc:IfcStructuralCurveMember" nillable="true"/>
 <xs:complexType name="IfcStructuralCurveMemberVarying">
  <xs:complexContent>
   <xs:extension base="ifc:IfcStructuralCurveMember"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcStructuralCurveMemberVarying
 SUBTYPE OF (IfcStructuralCurveMember);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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