IfcStructuralSurfaceReaction

Natural language names
deflächenförmige Auflagerreaktion: z.B. Auflagerverformung und -pressung
enStructural Surface Reaction
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcStructuralSurfaceReactionADDED
Semantic definitions at the entity
Entity definition

This entity defines a reaction which occurs distributed over a surface. A surface reaction may be connected with a surface member or surface connection.

HISTORY  New entity in IFC4.

Coordinate Systems:

See definitions at IfcStructuralActivity.

Topology Use Definitions:

See definitions at IfcStructuralActivity.

Informal Propositions:

  1. If the surface reaction is of the predefined type CONST, SELF\IfcStructuralActivity.AppliedLoad must not be of type IfcStructuralLoadConfiguration.
  2. If the surface reaction is of the predefined type BILINEAR, SELF\IfcStructuralActivity.AppliedLoad shall be of type IfcStructuralLoadConfiguration and shall contain three items with two-dimensional IfcStructuralLoadConfiguration.Locations, defining the location of the result samples in local coordinates of the surface reaction.
  3. If the surface reaction is of the predefined type DISCRETE, SELF\IfcStructuralActivity.AppliedLoad shall be of type IfcStructuralLoadConfiguration and shall contain two or more items with two-dimensional locations.
  4. If the surface reaction is of the predefined type ISOCONTOUR, SELF\IfcStructuralActivity.AppliedLoad shall be of type IfcStructuralLoadConfiguration and shall contain the same number of items as the set SELF.IfcProduct.Representation.Representations[?].Items. Each item in the load configuration shall have a two-dimensional location, defining the location of the result samples in local coordinates of the surface reaction. Each item in SELF\IfcStructuralActivity.AppliedLoad shall be located at exactly one of the isocontours.
    NOTE  The set of representation items is unordered, hence result locations are required to correlate result values and isocontours.
    NOTE  Isocontours are represented as IfcPCurves which are defined in terms of surface parameters u,v, while result locations are given in local surface item coordinates x,y. It is strongly recommended that the surface parameterization u,v is scaled 1:1 in order to avoid different scales of u,v versus x,y. If u,v are scaled 1:1 and the IfcPCurve's base surface is identical with the surface item's base surface, u,v and local x,y are identical.
  5. All items in SELF\IfcStructuralActivity.AppliedLoad\IfcStructuralLoadConfiguration.Values shall be of the same entity type.
Attribute definitions
#AttributeTypeCardinalityDescription B
10PredefinedTypeIfcStructuralSurfaceActivityTypeEnum[1:1] Type of reaction according to its distribution of load values.X
Formal Propositions
RuleDescription
HasPredefinedTypeThe attribute ObjectType shall be given if the predefined type is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcStructuralReaction IfcStructuralActivity 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
IfcStructuralActivity
8AppliedLoadIfcStructuralLoad[1:1] Load or result resource object which defines the load type, direction, and load values.

In case of activities which are variably distributed over curves or surfaces, IfcStructuralLoadConfiguration is used which provides a list of load samples and their locations within the load distribution, measured in local coordinates of the curve or surface on which this activity acts. The contents of this load or result distribution may be further restricted by definitions at subtypes of IfcStructuralActivity.

X
9GlobalOrLocalIfcGlobalOrLocalEnum[1:1] Indicates whether the load directions refer to the global coordinate system (global to the analysis model, i.e. as established by IfcStructuralAnalysisModel.SharedPlacement) or to the local coordinate system (local to the activity or connected item, as established by an explicit or implied representation and its parameter space).
NOTE, the informal definition of IfcRepresentationResource.IfcGlobalOrLocalEnum doe s not distinguish between "global coordinate system" and "world coordinate system". On the other hand, this distinction is necessary in the IfcStructuralAnalysisDomain where the shared "global" coordinate system of an analysis model may very well not be the same as the project-wide world coordinate system.
NOTE  In the scope of IfcStructuralActivity.GlobalOrLocal, the meaning of GLOBAL_COORDS is therefore not to be taken as world coordinate system but as the analysis model specific shared coordinate system. In contrast, LOCAL_COORDS is to be taken as coordinates which are local to individual structural items and activities, as established by subclass-specific geometry use definitions.
X
AssignedToStructuralItemIfcRelConnectsStructuralActivity
@RelatedStructuralActivity		S[0:1]Reference to the IfcRelConnectsStructuralActivity relationship by which activities are connected with structural items.
IfcStructuralReaction
IfcStructuralSurfaceReaction
10PredefinedTypeIfcStructuralSurfaceActivityTypeEnum[1:1] Type of reaction according to its distribution of load values.X
Definitions applying to Bridge View
Concept inheritance

#ConceptModel View
IfcRoot
Software IdentityBridge View
User IdentityBridge View
Object OwnershipBridge View
IfcObject
Property Sets for ObjectsBridge View
Formal representations
XSD Specification
 <xs:element name="IfcStructuralSurfaceReaction" type="ifc:IfcStructuralSurfaceReaction" substitutionGroup="ifc:IfcStructuralReaction" nillable="true"/>
 <xs:complexType name="IfcStructuralSurfaceReaction">
  <xs:complexContent>
   <xs:extension base="ifc:IfcStructuralReaction">
    <xs:attribute name="PredefinedType" type="ifc:IfcStructuralSurfaceActivityTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcStructuralSurfaceReaction
 SUBTYPE OF (IfcStructuralReaction);
  PredefinedType : IfcStructuralSurfaceActivityTypeEnum;
 WHERE
  HasPredefinedType : (PredefinedType <> IfcStructuralSurfaceActivityTypeEnum.USERDEFINED) OR EXISTS(SELF\IfcObject.ObjectType);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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