|Wand - Standard|
|Wall Standard Case|
|Item||SPF||XML||Change||Description||IFC2x3 to IFC4|
|OwnerHistory||MODIFIED||Instantiation changed to OPTIONAL. |
The IfcWallStandardCase defines a wall with certain constraints for the provision of parameters and with certain constraints for the geometric representation. The IfcWallStandardCase handles all cases of walls, that are extruded vertically:
and have a single thickness along the path for each wall layer, i.e.:
and have either:
and shall not have
The following parameter have to be provided:
The IfcWallStandardCase requires the provision of the wall axis either a straight line that is parallel to the x-axis of the object coordinate system, or a circular arc where the tangent at start is parallel to the x-axis of the object coordinate system. The direction of the wall axis shall be the positive direction of that x-axis.
The material of the wall is defined by the IfcMaterialLayerSetUsage and is attached by the IfcRelAssociatesMaterial objectified relationship. It is accessible by the inverse HasAssociations relationship. The material layer set usage has to be given (enforced by where rule).
An 'Axis' and a 'Body' shape representation has to be provided, and it is invalid to exchange a 'Tessellation', 'SurfaceModel', 'Brep' or 'MappedRepresentation' representation for the 'Body' shape representation of the IfcWallStandardCase.
HISTORY New entity in IFC2x.
|HasMaterialLayerSetUsage||A valid instance of IfcWallStandardCase relies on the provision of an IfcMaterialLayerSetUsage.|
|1||GlobalId||IfcGloballyUniqueId||[1:1]||Assignment of a globally unique identifier within the entire software world.||X|
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.
|3||Name||IfcLabel||[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|
|4||Description||IfcText||[0:1]||Optional description, provided for exchanging informative comments.||X|
|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|
|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|
|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|
|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|
|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|
|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|
|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|
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.
|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|
|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|
|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|
|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|
|6||ObjectPlacement||IfcObjectPlacement||[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|
|7||Representation||IfcProductRepresentation||[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|
|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|
|8||Tag||IfcIdentifier||[0:1]||The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level.||X|
|S[0:1]||Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element.||X|
|S[0:?]||Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to.||X|
|S[0:?]||Reference to the interference relationship to indicate the element that is interfered. The relationship, if provided, indicates that this element has an interference with one or many other elements.
NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements.
|S[0:?]||Reference to the interference relationship to indicate the element that interferes. The relationship, if provided, indicates that this element has an interference with one or many other elements.
NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements.
|S[0:?]||Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement.||X|
|S[0:?]||Reference relationship to the spatial structure element, to which the element is additionally associated. This relationship may not be hierarchical, an element may be referenced by zero, one or many spatial structure elements.||X|
|S[0:?]||Reference to the IfcRelVoidsElement relationship that creates an opening in an element. An element can incorporate zero-to-many openings. For each opening, that voids the element, a new relationship IfcRelVoidsElement is generated.||X|
|S[0:?]||Reference to the connection relationship with realizing element. The relationship, if provided, assigns this element as the realizing element to the connection, which provides the physical manifestation of the connection relationship.||X|
|S[0:?]||Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces.||X|
|S[0:?]||Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element.||X|
|S[0:1]||Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierachical, i.e. an element may only be assigned directly to zero or one spatial structure.||X|
|S[0:?]||Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElement. It defines the concept of an element having coverings associated.||X|
Predefined generic type for a wall that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcWallType is assigned, providing its own IfcWallType.PredefinedType.
Material Layer Set Usage
The Material Layer Set Usage concept applies to this entity.
Multi-layer walls can be represented by refering to several IfcMaterialLayer's within the IfcMaterialLayerSet that is referenced from the IfcMaterialLayerSetUsage.
Material information can also be given at the IfcWallType, defining the common attribute data for all occurrences of the same type. It is then accessible by the inverse IsDefinedBy relationship pointing to IfcSlabType.HasAssociations and via IfcRelAssociatesMaterial.RelatingMaterial.
The IfcWallType should then have a unique IfcMaterialLayerSet, that is referenced by the IfcMaterialLayerSetUsage assigned to all occurrences of this IfcWallType.
EXAMPLE Figure 246 illustrates assignment of IfcMaterialLayerSetUsage and IfcMaterialLayerSet to the wall type and the wall occurrence.
Figure 246 — Wall Standard Object Typing
Figure 247 illustrates material layer usage, where the following conventions shall be met:
Figure 247 — Wall material layers
Product Local Placement
The Product Local Placement concept applies to this entity as shown in Table 192.
Table 192 — IfcWallStandardCase Product Local Placement
The following restriction is imposed:
Axis 2D Geometry
The Axis 2D Geometry concept applies to this entity as shown in Table 193.
Table 193 — IfcWallStandardCase Axis 2D Geometry
The wall axis is represented by a two-dimensional open curve within a particular shape representation. The wall axis is used to apply the material layer set usage parameter to the wall geometry.
EXAMPLE Figure 248 illustrates an axis representation for a straight wall. In case of a straight wall, the set of items shall include a single geometric representation item of type IfcPolyline or IfcTrimmedCurve with the BasisCurve being an IfcLine. The IfcPolyline or IfcTrimmedCurve shall be parallel (here in a special case co-linear) to the x-axis of the object coordinate system. The direction shall be identical to the direction of the x-axis.
Figure 248 — Wall axis straight
EXAMPLE Figure 249 illustrates an axis representation for a curved wall. In case of a curved wall, the set of items shall include a single geometric representation item of type IfcTrimmedCurve. The curve shall have a BasisCurve of type IfcCircle. The tangent of the IfcTrimmedCurve shall be parallel at start to the x-axis of the object coordinate system. The direction shall be identical to the direction of the x-axis.
Figure 249 — Wall axis curved
Body SweptSolid Geometry
The Body SweptSolid Geometry concept applies to this entity.
The following additional constraints apply to the 'SweptSolid' representation:
The profile of a wall is described in the ground view and extruded vertically. The profile (also identical with the foot print of the wall) is defined by the IfcArbitraryClosedProfileDef (excluding its subtypes). The profile is given with all wall connections already resolved.
Figure 250 illustrates a body representation for a straight wall. In case of a straight wall, the two sides of the profile shall be parallel to the wall axis, that is, the wall has a single unchanged thickness.
Figure 251 illustrates a body representation for a curved wall. In case of a curved wall, the two sides of the profile shall be parallel (with defined offset) to the wall axis, that is, the wall has a single unchanged thickness.
Figure 250 — Wall body extrusion straight
Figure 251 — Wall body extrusion curved
Body Clipping Geometry
The Body Clipping Geometry concept applies to this entity.
The following constraints apply to the 'Clipping' representation:
Figure 252 illustrates a clipping for a straight wall using an IfcPolygonalBoundedHalfSpace as SecondOperand in the IfcBooleanClippingResult.
Figure 253 illustrates a clipping for a curved wall using an IfcHalfSpaceSolid as SecondOperand in the IfcBooleanClippingResult.
Figure 252 — Wall body clipping straight
Figure 253 — Wall body clipping curved
|Software Identity||Common Use Definitions|
|Revision Control||Common Use Definitions|
|Object Occurrence Predefined Type||Common Use Definitions|
|Box Geometry||Common Use Definitions|
|FootPrint Geometry||Common Use Definitions|
|Body SurfaceOrSolidModel Geometry||Common Use Definitions|
|Body SurfaceModel Geometry||Common Use Definitions|
|Body Tessellation Geometry||Common Use Definitions|
|Body Brep Geometry||Common Use Definitions|
|Body AdvancedBrep Geometry||Common Use Definitions|
|Body CSG Geometry||Common Use Definitions|
|Mapped Geometry||Common Use Definitions|
|Mesh Geometry||Common Use Definitions|
|Surface 3D Geometry||Common Use Definitions|
|Object Typing||Common Use Definitions|
|Property Sets for Objects||Common Use Definitions|
|Quantity Sets||Common Use Definitions|
|Material Layer Set||Common Use Definitions|
|Path Connectivity||Common Use Definitions|
|Spatial Containment||Common Use Definitions|
|Surface Geometry||Common Use Definitions|
|Element Voiding||Common Use Definitions|
|Product Assignment||Common Use Definitions|
|Material Layer Set Usage||Common Use Definitions|
|Product Local Placement||Common Use Definitions|
|Axis 2D Geometry||Common Use Definitions|
|Body SweptSolid Geometry||Common Use Definitions|
|Body Clipping Geometry||Common Use Definitions|
SUBTYPE OF (IfcWall);
HasMaterialLayerSetUsage : SIZEOF (QUERY(temp <* USEDIN(SELF, 'IFCKERNEL.IFCRELASSOCIATES.RELATEDOBJECTS') | ('IFCPRODUCTEXTENSION.IFCRELASSOCIATESMATERIAL' IN TYPEOF(temp)) AND ('IFCMATERIALRESOURCE.IFCMATERIALLAYERSETUSAGE' IN TYPEOF(temp.RelatingMaterial)) )) = 1;
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