IfcStructuralSurfaceMemberVarying

Natural language names
dePlatte / Scheibe mit veränderlicher Dicke
enStructural Surface Member Varying
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcStructuralSurfaceMemberVarying
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      PredefinedTypeMODIFIEDType changed from IfcStructuralSurfaceTypeEnum to IfcStructuralSurfaceMemberTypeEnum.
      SubsequentThicknessXDELETED
      VaryingThicknessLocationXDELETED
Semantic definitions at the entity
Entity definition

This entity describes surface members with varying section properties. The properties are provided by means of Pset_StructuralSurfaceMemberVaryingThickness via IfcRelDefinesByProperties, or by means of aggregation: An instance of IfcStructuralSurfaceMemberVarying may be composed of two or more instances of IfcStructuralSurfaceMember with differing section properties. These subordinate members relate to the instance of IfcStructuralSurfaceMemberVarying by IfcRelAggregates.

NOTE  It is recommended that structural activities (actions or reactions) are not connected with aggregated IfcStructuralSurfaceMemberVarying but only with the IfcStructuralSurfaceMembers in the aggregation. That way, difficulties in interpretation of local coordinates are avoided.
HISTORY  New entity in IFC2x2.
IFC4 CHANGE  Use definition changed and attributes deleted.

Coordinate Systems:

See definitions at IfcStructuralItem and IfcStructuralSurfaceMember. The local coordinates of an aggregate are generally undefined since continuity of local coordinates of the parts is not ensured.

Material Use Definition

In case of aggregation, only the individual parts (direct instances of IfcStructuralSurfaceMember) carry material and thickness information. Otherwise, definitions at IfcStructuralSurfaceMember apply.

Inherited definitions from supertypes
Entity inheritance IfcStructuralSurfaceMember IfcStructuralMember IfcStructuralItem IfcProduct IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionC
IfcRoot
1GlobalIdIfcGloballyUniqueId[1:1] Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory[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
3NameIfcLabel[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
4DescriptionIfcText[0:1] 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). 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). 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. 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). 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). 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[0:1] 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. 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. 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. 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. X
IfcProduct
6ObjectPlacementIfcObjectPlacement[0:1] 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[0:1] 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
IfcStructuralSurfaceMember
8PredefinedTypeIfcStructuralSurfaceMemberTypeEnum[1:1] Type of member with respect to its load carrying behavior in this analysis idealization.X
9ThicknessIfcPositiveLengthMeasure[0:1] Defines the typically understood thickness of the structural surface member, measured normal to its reference surface.X
IfcStructuralSurfaceMemberVarying
Definitions applying to Common Use Definitions

 Instance diagram

Concept usage

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 640.

PredefinedTypeNameProperties
 Pset_StructuralSurfaceMemberVaryingThicknessSingle Value
NameValue
Thickness1IfcPositiveLengthMeasure
Thickness2IfcPositiveLengthMeasure
Thickness3IfcPositiveLengthMeasure

Table 640 — IfcStructuralSurfaceMemberVarying Property Sets for Objects



Concept inheritance

#ConceptModel View
IfcRoot
Software IdentityCommon Use Definitions
Revision ControlCommon Use Definitions
IfcObject
Object Occurrence Predefined TypeCommon Use Definitions
IfcStructuralSurfaceMember
Material Layer Set UsageCommon Use Definitions
Reference TopologyCommon Use Definitions
Structural ConnectivityCommon Use Definitions
IfcStructuralSurfaceMemberVarying
Property Sets for ObjectsCommon Use Definitions
Formal representations
XSD Specification
 <xs:element name="IfcStructuralSurfaceMemberVarying" type="ifc:IfcStructuralSurfaceMemberVarying" substitutionGroup="ifc:IfcStructuralSurfaceMember" nillable="true"/>
 <xs:complexType name="IfcStructuralSurfaceMemberVarying">
  <xs:complexContent>
   <xs:extension base="ifc:IfcStructuralSurfaceMember"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcStructuralSurfaceMemberVarying
 SUBTYPE OF (IfcStructuralSurfaceMember);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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