Model Building Storey

Overview

Provides the information concerning building storeys within a basic building model.
A building storey represents an aggregation of spaces at a particular horizontal (or nearly horizontal level within a building. The building storey is an element within the spatial structure hierarchy for the components of a building project (together with site, building, and space).
A building storey may exist at several levels within a building (the floor level of a particular building storey may change several times). To allow for this, a building storey may be broken down into parts, each part representing a different floor level. Similarly, several building storeys may be brought together vertically to represent a single vertical space in a building that is characterised as a building storey (although it may, for instance, be described as an atrium). For this purpose, a building storey complex can be established.
The information presented in this functional part is sufficient for the exchange of a basic building model. This information includes:

Specification of building storey name and description if required
An extended name for the building storey also be specified if required
Dimensional information about the building storey may be given to enable the creation of a shape representation if the shape cannot otherwise be found from the building elements (wall, floor etc.) from which the building storey is constructed. This could be the case during early stages of design. The form of shape representation used for a building storey may differ at various stages of a building project and these are specifically identified within exchange requirements. Particular forms of shape representation may include
- 2D footprint representation with additional height information given as a quantity
- 3D body representation
The length, width and height dimensions of the building storey may be established by the bounding box shape representation
Specification of whether the building storey concerned is a complex of several building storeys, an elemental (single) building storey or a part of a building storey.
Where the building storey is a 'complex', identification of the elemental building storeys that are nested into the complex.
Where the building storey is a 'part', identification of the building storey into which the part is nested
It should be noted that the 'part' breakdown of a building storey may give rise to parts that overlap in terms of their shape content. Therefore, the overall shape of a building storey should not be derived by adding together the shapes of parts.
The elevation of the building storey above the reference elevation of the building may be given.
An indication of whether this is the storey of the building at which the main entrance to a building is located may be given.
An indication of the whether the building storey concerned is above or below ground level may be given.

Results

Model of building storey occurrence(s) including shape representation and other basic information

Description	Entity/Pset/Functional Part	MAN	REC	OPT
A building storey is directly specified as an occurrence. It does not have a defining type entity.
Set the global unique identifier	IfcBuildingStorey.GlobalId::IfcGloballyUniqueId
Apply the owner history	IfcBuildingStorey.OwnerHistory::fp_apply_owner_history
Specify the name of the building storey	IfcBuildingStorey.Name::IfcLabel
Specify a description for the building storey	IfcBuildingStorey.Description::IfcText
Specify an extended name for the building storey if required	IfcBuildingStorey.LongName::IfcLabel
Establish the placement of the origin point of the building storey	IfcBuildingStorey.ObjectPlacement::fp_place_object
If the shape representation of the building storey cannot be defined by the elements used in its construction, define its shape representation Note that a building storey may have several representations.	IfcBuildingStorey.Representation::fp_represent_product
Handle the composition of the building storey
Set the composition type of the building storey occurrence (complex, element or part)	IfcBuildingStorey.CompositionType
If the composition of the building storey is a 'complex', identify the elemental storeys that form part of the complex	fp_nest[building_storey]
If the composition of the building storey is a 'part', identify the elemental building storey of which it forms a part	fp_nest[building_storey]
Any elements that are to be contained within the building storey should be identified	fp_contains_in_spatial_structure[building_storey, Unknown macro: {elements} ]
Define properties for the building storey
Identify if this is the storey of the building at which the main entrance to a building is located (TRUE) or not (FALSE).	Pset_BuildingStoreyCommon.EntranceLevel
Identify if this building storey is above (TRUE) or below (FALSE) ground level	Pset_BuildingStoreyCommon.AboveGround
Define the common property set for the building	fp_define_by_properties

IFC Entities Required

IfcBuildingStorey
IfcElement
IfcObject
IfcProduct
IfcRoot
IfcSpatialStructureElement

IFC Datatypes Required

IfcElementCompositionEnum
IfcGloballyUniqueId
IfcLabel
IfcLengthMeasure
IfcText

IFC Functions Required

-

IFC Property Sets Required

Pset_BuildingStoreyCommon

IDM Functional Parts Required

fp_address
fp_aggregates
fp_apply_owner_history
fp_apply_quantity
fp_contains_in_spatial_structure
fp_define_by_properties
fp_place_object
fp_represent_product

EXPRESS Schema

SCHEMA FP_MODEL_BUILDING_STOREY;

  TYPE IfcGloballyUniqueId = STRING (22) FIXED;
  END_TYPE;

  TYPE IfcLabel = STRING;
  END_TYPE;

  TYPE IfcLengthMeasure = REAL;
  END_TYPE;

  TYPE IfcText = STRING;
  END_TYPE;

  TYPE IfcElementCompositionEnum = ENUMERATION OF
    (COMPLEX,
     ELEMENT,
     PARTIAL);
  END_TYPE;

  ENTITY IfcProduct
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcObject);
      ObjectPlacement : OPTIONAL fp_place_object;
      Representation  : OPTIONAL fp_represent_product;
    WHERE
      WR1 : (EXISTS(Representation) AND EXISTS(ObjectPlacement))
            OR (EXISTS(Representation) AND 
            (NOT('IFC2X2_FINAL.IFCPRODUCTDEFINITIONSHAPE' IN TYPEOF(Representation))))
            OR (NOT(EXISTS(Representation)));
  END_ENTITY;

  ENTITY IfcObject
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
      ObjectType : OPTIONAL IfcLabel;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* IsDefinedBy | 'IFC2X2_FINAL.IFCRELDEFINESBYTYPE' IN TYPEOF(temp))) <= 1;
  END_ENTITY;

  ENTITY IfcRoot
    ABSTRACT SUPERTYPE;
      GlobalId     : IfcGloballyUniqueId;
      Name         : OPTIONAL IfcLabel;
      Description  : OPTIONAL IfcText;
      OwnerHistory : fp_apply_owner_history;
    UNIQUE
      UR1 : GlobalId;
  END_ENTITY;

  ENTITY IfcSpatialStructureElement
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcProduct);
      LongName        : OPTIONAL IfcLabel;
      CompositionType : IfcElementCompositionEnum;
    WHERE
      WR41 : (HIINDEX(SELF\IfcObject.Decomposes) = 1) 
             AND
             ('IFC2X2_FINAL.IFCRELAGGREGATES' IN TYPEOF(SELF\IfcObject.Decomposes[1])) 
             AND
             (('IFC2X2_FINAL.IFCPROJECT' IN TYPEOF (SELF\IfcObject.Decomposes[1].RelatingObject)) OR
             ('IFC2X2_FINAL.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF (SELF\IfcObject.Decomposes[1].RelatingObject))
             );
  END_ENTITY;

  ENTITY IfcBuildingStorey
    SUBTYPE OF(IfcSpatialStructureElement);
      Elevation : OPTIONAL IfcLengthMeasure;
  END_ENTITY;

  ENTITY fp_apply_owner_history;
  END_ENTITY;

  ENTITY fp_aggregates;
  END_ENTITY;

  ENTITY fp_apply_quantity;
  END_ENTITY;

  ENTITY fp_contains_in_spatial_structure;
  END_ENTITY;

  ENTITY fp_define_by_properties;
  END_ENTITY;

  ENTITY fp_place_object;
  END_ENTITY;

  ENTITY fp_represent_product;
  END_ENTITY;

END_SCHEMA;

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