IfcStructuralSurfaceMember

Natural language names
dePlatte / Scheibe: flächenförmiges statisches Bauteil mit Beanspruchung quer oder längs zur Fläche
enStructural Surface Member
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcStructuralSurfaceMember
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      PredefinedTypeMODIFIEDType changed from IfcStructuralSurfaceTypeEnum to IfcStructuralSurfaceMemberTypeEnum.
Semantic definitions at the entity
Entity definition

Instances of IfcStructuralSurfaceMember describe face members, that is, structural analysis idealizations of slabs, walls, and shells. Surface members may be planar or curved.

HISTORY  New entity in IFC2x2.
IFC4 CHANGE  Use definitions changed, WHERE rule added.

Coordinate Systems:

See definitions at IfcStructuralItem. The local coordinate system is established by the reference surface given by topology representation.

Material Use Definition

The material of direct instances IfcStructuralSurfaceMember (in contrast to instances of the subtype IfcStructuralSurfaceMemberVarying) is defined by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.

The material is specified minimally by a name which corresponds with an agreed upon standardized structural material designation. An external reference to the source which specifies the material designation should be provided. Alternatively, structural material properties may be provided by means of IfcMechanicalMaterialProperties and IfcExtendedMaterialProperties.

Direct instances of IfcStructuralSurfaceMember are assumed to be located centrically relative to their reference surface. Their depth is provided in the attribute Thickness.

Attribute definitions
#AttributeTypeCardinalityDescription B
8PredefinedTypeIfcStructuralSurfaceMemberTypeEnum[1:1] Type of member with respect to its load carrying behavior in this analysis idealization.X
9Thickness- This attribute is out of scope for this model view definition and shall not be set.
Formal Propositions
RuleDescription
HasObjectTypeThe attribute ObjectType shall be given if the predefined type is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcStructuralSurfaceMemberVarying IfcStructuralMember IfcStructuralItem IfcProduct IfcObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionB
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).
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.
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
5ObjectType- This attribute is out of scope for this model view definition and shall not be set.
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
9Thickness- This attribute is out of scope for this model view definition and shall not be set.
Definitions applying to Bridge View

 Instance diagram

Concept usage

Material Layer Set Usage

The Material Layer Set Usage concept applies to this entity.

The material of direct instances IfcStructuralSurfaceMember (in contrast to instances of the subtype IfcStructuralSurfaceMemberVarying) is defined by IfcMaterialLayerSetUsage and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.

The material is specified minimally by a name which corresponds with an agreed upon standardized structural material designation. An external reference to the source which specifies the material designation should be provided. Alternatively, structural material properties may be provided by means of IfcMaterialProperties.

In the absense of material layer set usage, direct instances of IfcStructuralSurfaceMember are assumed to be located centrically relative to their reference surface. Their depth is provided in the attribute Thickness.



Reference Topology

The Reference Topology concept applies to this entity as shown in Table 87.

Topology
IfcFaceSurface

Table 87 — IfcStructuralSurfaceMember Reference Topology

Direct instances of IfcStructuralSurfaceMember shall have a topology representation which consists of one IfcFaceSurface, representing the reference surface of the surface member. See definitions at IfcStructuralItem for further specifications.

The local coordinate system is established by the reference surface given by topology representation.

Exchange
Import R
Export R


Structural Connectivity

The Structural Connectivity concept applies to this entity as shown in Table 88.

StructuralConnectionDescription
IfcStructuralCurveConnectionConnections to curve members along edge(s) of surface.
IfcStructuralSurfaceConnectionConnections to surface members within face(s) of surface.

Table 88 — IfcStructuralSurfaceMember Structural Connectivity

Exchange
Import R
Export R


Concept inheritance

#ConceptModel View
IfcRoot
Software IdentityBridge View
User IdentityBridge View
Object OwnershipBridge View
IfcObject
Property Sets for ObjectsBridge View
IfcStructuralSurfaceMember
Material Layer Set UsageBridge View
Reference TopologyBridge View
Structural ConnectivityBridge View
Formal representations
XSD Specification
 <xs:element name="IfcStructuralSurfaceMember" type="ifc:IfcStructuralSurfaceMember" substitutionGroup="ifc:IfcStructuralMember" nillable="true"/>
 <xs:complexType name="IfcStructuralSurfaceMember">
  <xs:complexContent>
   <xs:extension base="ifc:IfcStructuralMember">
    <xs:attribute name="PredefinedType" type="ifc:IfcStructuralSurfaceMemberTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcStructuralSurfaceMember
 SUPERTYPE OF(IfcStructuralSurfaceMemberVarying)
 SUBTYPE OF (IfcStructuralMember);
  PredefinedType : IfcStructuralSurfaceMemberTypeEnum;
  Thickness : OPTIONAL IfcStrippedOptional;
 WHERE
  HasObjectType : (PredefinedType <> IfcStructuralSurfaceMemberTypeEnum.USERDEFINED) OR EXISTS(SELF\IfcObject.ObjectType);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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