Property

LoadBearing

Namespace URI

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

Domain

IFC

Domain version

4.3

Description

Indicates whether the object is intended to carry loads (TRUE) or not (FALSE).

DataType

Boolean

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

The IfcBuildingElementProxy is a proxy definition that provides the same functionality as subtypes of IfcBuildingElement, but without having a predefined meaning of the special type of building element it represents.IfcBuildingElementProxy may be used:To exchange special types of building elements for which the current specification does not yet provide a semantic definition. To represent building elements for which the participating applications can not provide a semantic definition.IFC4.3.0.0 CHANGE IfcBuildingElementProxy should no longer be used as spatial placeholders or provisions. Use IfcVirtualElement instead. HISTORY New entity in IFC2x.

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 footing is a part of the foundation of a structure that spreads and transmits the load to the soil. A footing is also characterized as shallow foundation, where the loads are transferred to the ground near the surface.{ .extDef}NOTE Definition according to ISO 6707-1: stepped construction that spreads the load at the foot of a wall or column. HISTORY New entity in IFC2x2. NOTE Slab foundations, also called slab-on-grade, are not instantiated as IfcFooting but as IfcSlab with a predefined type of IfcSlabTypeEnum.BASESLAB. Deep foundations, which transfer the loads to subsurface layers, are represented by IfcDeepFoundation and its subtypes IfcCaissonFoundation and IfcPile.

An IfcMember is a structural member designed to carry loads between or beyond points of support. It is not required to be load bearing. The orientation of the member (being horizontal, vertical or sloped) is not relevant to its definition (in contrary to IfcBeam and IfcColumn). An IfcMember represents a linear structural element from an architectural or structural modeling point of view and shall be used if it cannot be expressed more specifically as either an IfcBeam or an IfcColumn.There are two main representations for member occurrences:IfcMember with IfcMaterialProfileSetUsage is used for all occurrences of members, that have a profile defined that is swept along a directrix. The profile might be changed 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 members 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. IfcMember without IfcMaterialProfileSetUsage is used for all other occurrences of members, particularly for members with changing profile sizes along the extrusion, or members defined by non-linear extrusion, or members having only 'Brep', or 'SurfaceModel' geometry, or if a more parametric representation is not intended.NOTE The representation of a member in a structural analysis model is provided by IfcStructuralCurveMember being part of an IfcStructuralAnalysisModel. HISTORY New entity in IFC2x2 Addendum 1.

A pile is a slender timber, concrete, or steel structural element, driven, jetted, or otherwise embedded on end in the ground for the purpose of supporting a load. A pile is also characterized as deep foundation, where the loads are transferred to deeper subsurface layers.{ .extDef}NOTE Definition according to ISO 6707-1: slender structural member, substantially underground, intended to transmit force(s) into loadbearing strata below the surface of the ground. NOTE Shallow foundations, which transfer the loads to the ground near its surface, are represented by IfcFooting. HISTORY New entity in IFC2x2.

An IfcPlate is a planar and often flat part with constant thickness. A plate may carry loads between or beyond points of support, or provide stiffening. The location of the plate (being horizontal, vertical or sloped) is not relevant to its definition.Plates are normally made of steel, other metallic material, or by glass panels. However the definition of IfcPlate is material independent and specific material information shall be handled by using IfcAssociatesMaterial to assign a material specification to the IfcPlate.Plates are often add-on parts. This is represented by the IfcRelAggregates decomposition mechanism used to aggregate parts, such as IfcPlate, into a container element such as IfcElementAssembly or IfcCurtainWall.An instance of IfcPlate should preferably get its geometric representation and material assignment through the type definition by IfcPlateType assigned using the IfcRelDefinesByType relationship. This allows identical plates in a construction to be represented by the same instance of IfcPlateType.A plate may have openings, such as voids or recesses. They are defined by an IfcOpeningElement attached to the plate using the inverse relationship HasOpenings pointing to IfcRelVoidsElement. The position number of a plate as often used in steel construction is assigned through the attribute IfcElement.TagThere are two main representations for plate occurrences:IfcPlate with IfcMaterialLayerSetUsage is used for all occurrences of plates, that are prismatic and where the thickness parameter can be fully described by the IfcMaterialLayerSetUsage. These plates are always represented geometrically by a 'SweptSolid' geometry (or by a 'Clipping' geometry based on 'SweptSolid'), if a 3D geometric representation is assigned. IfcPlate without IfcMaterialLayerSetUsage is used for all other occurrences of plates, particularly for plates with changing thickness, or plates with non planar surfaces, and plates having only 'SurfaceModel' or 'Brep' geometry or if a more parametric representation is not intended.REFERENCE Definition according to ISO 6707-1: thin, rigid, flat, metal product, of a thickness greater than that of a sheet. NOTE The representation of a plate in a structural analysis model is provided by IfcStructuralSurfaceMember being part of an IfcStructuralAnalysisModel. HISTORY New entity in IFC2x2

A ramp is a vertical passageway which provides a human or vehicle circulation link between one floor level and another floor level at a different elevation. It may include a landing as an intermediate floor slab. A ramp normally does not include steps.{ .extDef}NOTE Definition according to ISO 6707-1: Inclined way or floor joining two surfaces at different levels.The IfcRamp shall either be represented:as a ramp assembly that aggregates all parts(ramp flight, landing, etc.) with own shape representations, or as a single ramp without decomposition including all shape representations directly at the ramp entity.NOTE In case of an IfcRamp being the assembly of all parts of the ramp the aggregation is handled by the IfcRelAggregates relationship, relating an IfcRamp with the related IfcRampFlight and landings, IfcSlab with PredefinedType=LANDING. IfcRailing's belonging to the ramp may also be included into the aggregation. NOTE Model View Definitions and implementer agreements may restrict the IfcRamp being an assembly to not have an independent shape representation, but to always require that the decomposed parts have a shape representation. In this case, at least the 'Body' geometric representations shall not be provided directly at IfcRamp if it is an assembly. The 'Body' geometric representation of the IfcRamp is then the sum of the 'Body' shape representation of the parts within the decomposition structure. HISTORY New entity in IFC2.0.

A roof is the covering of the top part of a building, it protects the building against the effects of weather.{ .extDef}NOTE Definition according to ISO 6707-1: construction enclosing the building from above.The IfcRoof shall either be represented:as a roof assembly that aggregates all parts (slabs, rafters and purlins, or other included roofs, such as dormers) with own shape representation, or as a single roof without decomposition including all shape representations directly at the roof entity.NOTE In case of an IfcRoof being the assembly of all parts of the roof the aggregation is handled by the IfcRelAggregates relationship, relating an IfcRoof with the related roof elements, like slabs (represented by IfcSlab), rafters and purlins (represented by IfcBeam), or other included roofs, such as dormers (represented by IfcRoof). NOTE Model View Definitions and implementer agreements may restrict the IfcRoof being an assembly to not have an independent shape representation, but to always require that the decomposed parts have a shape representation. In this case, at least the 'Body' geometric representations shall not be provided directly at IfcRoof if it is an assembly. The 'Body' geometric representation of the IfcRoof is then the sum of the 'Body' shape representation of the parts within the decomposition structure. HISTORY New entity in IFC2.0.

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