Property

Length

Namespace URI

http://identifier.buildingsmart.org/uri/buildingsmart/ifc-4.3/prop/Length

Domain

IFC

Domain version

4.3

Description

The length of the object.

DataType

Real

PropertyValueKind

Single

Classifications

An IfcBeam is typically a horizontal, or nearly horizontal, structural member that is capable of withstanding load primarily by resisting bending. It may also represent such a member from an architectural point of view. It is not required to be load bearing.There are two main representations for beam occurrences:IfcBeam with IfcMaterialProfileSetUsage is used for all occurrences of beams, that have a profile defined that is swept along a directrix. The profile might change uniformly by a taper definition along the directrix. The profile parameter and its cardinal point of insertion can be fully described by the IfcMaterialProfileSetUsage. These beams are always represented geometricly by an 'Axis' and a 'SweptSolid' or 'AdvancedSweptSolid' shape representation (or by a 'Clipping' geometry based on the swept solid), if a 3D geometric representation is assigned. IfcBeam without IfcMaterialProfileSetUsage is used for all other occurrences of beams, particularly for beams with non-uniformly changing profile sizes along the sweep, or beams having only 'AdvancedBrep', 'Brep', or 'SurfaceModel' geometry, if a more parametric representation is not intended.For any other longitudinal structural member, not constrained to be predominately horizontal nor vertical, or where this semantic information is irrelevant, the entity IfcMember should be used.REFERENCE Definition according to ISO 6707-1: structural member for carrying load(s) between or beyond points of support, usually narrow in relation to its length and horizontal or nearly so. NOTE The entity IfcBeamStandardCase has been deleted, IfcBeam with IfcMaterialProfileSetUsage is used instead. NOTE The representation of load-bearing beams in a structural analysis model is provided by subtypes of IfcStructuralMember (with IfcStructuralCurveMember being mostly applicable) as part of an IfcStructuralAnalysisModel. The camber of a beam may be defined by assigning an IfcStructuralCurveMember with displacement coordinates. Multiple sets of camber ordinates may be provided that are qualified by the particular load case, where full dead load would typically be used for fabrication, and other scenarios used for other loading conditions such as during construction. HISTORY New entity in IFC1.0

A cable carrier segment is a flow segment that is specifically used to carry and support cabling.HISTORY New entity in IFC4{ .note}

A cable segment is a flow segment used to carry electrical power, data, or telecommunications signals.A cable segment is used to typically join two sections of an electrical network or a network of components carrying the electrical service.HISTORY New entity in IFC4{ .note}

Chimneys are typically vertical, or as near as vertical, parts of the construction of a building and part of the building fabric. Often constructed by pre-cast or insitu concrete, today seldom by bricks.{ .extDef}NOTE Definition according to ISO 6707-1: construction containing one or more flues. Flue: Duct designed to convey the products of combustion to the open air. Chimney stack: Part of the chimney that projects above a roof. HISTORY New entity in IFC4.

An IfcColumn is a vertical structural or architectural member which often is aligned with a structural grid intersection. In most cases it represents a vertical, or nearly vertical, structural member that transmits, through compression, the weight of the structure above to other structural elements below. It may also represent such a member from an architectural point of view in which case it may represent a non load bearing element. Whether it is a structural load bearing element or a non-load bearing element is determined by the Pset_ColumnCommon.LoadBearing property.There are two main representations for column occurrences:IfcColumn with IfcMaterialProfileSetUsage is used for all occurrences of columns, that have a profile defined that is swept along a directrix. The profile might change uniformly by a taper definition along the directrix. The profile parameter and its cardinal point of insertion can be fully described by the IfcMaterialProfileSetUsage. These columns are always represented geometricly by an 'Axis' and a 'SweptSolid' or 'AdvancedSweptSolid' shape representation (or by a 'Clipping' geometry based on the swept solid), if a 3D geometric representation is assigned. IfcColumn is used for all other occurrences of columns, particularly for columns with changing profile sizes along the extrusion, or columns defined by non-linear extrusion, or columns having only 'Brep', or 'SurfaceModel' geometry, if a more parametric representation is not intended.For any longitudial structural member, not constrained to be predominately horizontal nor vertical, or where this semantic information is irrelevant, the entity IfcMember exists.REFERENCE Definition according to ISO 6707-1 structural member of slender form, usually vertical, that transmits to its base the forces, primarily in compression, that are applied to it. NOTE The entity IfcColumnStandardCase has been deleted, IfcColumn with IfcMaterialProfileSetUsage is used instead. NOTE The representation of a column in a structural analysis model is provided by IfcStructuralCurveMember being part of an IfcStructuralAnalysisModel. HISTORY New entity in IFC1.0

A built element whose length greatly exceeds its thickness and often also its width, usually of a single material laid on site on top of another horizontal or nearly horizontal built element. A course is distinctive from a earthworks element in that a course is a graded granular (which can be bound or unbound) material that is generally processed in some fashion, where as earthworks elements are soil earthen based structure that can be formed by removal and transport of general ground material. Structurally a course does not have capacity to carry loads over open span, or to be removed or replaced as a single unit. examples of courses include: * Graded aggregate layers * Graded sand layers * Cement bounded material (CBM) * Asphalt layers

A curtain wall is a wall of a building which is an assembly of components, hung from the edge of the floor/roof structure rather than bearing on a floor. Curtain wall is represented as a building element assembly and implemented as a subtype of IfcBuildingElement that uses an IfcRelAggregates relationship. A curtain wall is often external, but using Pset_CurtainWallCommon.IsExternal can be used to define interior curtain walls.{ .extDef}NOTE Definition according to ISO 6707-1: non load bearing wall positioned on the outside of a building and enclosing it. HISTORY New entity in IFC2.0The geometric representation of IfcCurtainWall is given by the IfcProductDefinitionShape, allowing multiple geometric representations. Independent 'Body' geometric representation, as described below, should only be used when the IfcCurtainWall is not defined as an aggregate. If defined as an aggregate, the geometric representation is the sum of the representations of the components within the aggregate.The geometric representation of IfcCurtainWall is defined using the following multiple shape representations for its definition:Axis: A two-dimensional open curve (for restrictions see below) defining the axis for the curtain wall. This is an optional representation for curtain walls. Body: A surface model or boundary representation model representation defining the 3D shape of the curtain wall. If the IfcCurtainWall has components (referenced by SELF\IfcObject.IsDecomposedBy) then no independent shape representation with RepresentationType = 'Body' shall be defined. The body of IfcCurtainWall is then geometrically represented by the shape representation of its components. The components are accessed via SELF\IfcObject.IsDecomposedBy[1].RelatedObjects. If the IfcCurtainWall has no components defined (empty set of SELF\IfcObject.IsDecomposedBy) then the IfcCurtainWall may be represented by an shape representation with the RepresentationIdentifier ='Body'.

Recess or chamber formed to permit access for inspection of substructure and services.

Recessed or small chamber into which liquid is drained to facilitate its collection for removal.

A duct fitting is a junction or transition in a ducted flow distribution system or used to connect duct segments, resulting in changes in flow characteristics to the fluid such as direction and flow rate.HISTORY New entity in IFC4{ .note}

Show all classifications (46) »

Classifications of other domains

structural supporting object in a straight linear form withstanding bending moments

carrying object between discrete positions

structural supporting object in a curved or straight linear form transferring compressing forces to other structural objects

closed enclosure guiding object in a non-circular rigid form

assembly system forming separation towards underground

Show all classifications of other domains (22) »