6.1.3.18 IfcMember
6.1.3.18.1 Semantic definition
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.
6.1.3.18.2 Entity inheritance
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- IfcMember
- IfcBeam
- IfcBearing
- IfcBuildingElementProxy
- IfcChimney
- IfcColumn
- IfcCourse
- IfcCovering
- IfcCurtainWall
- IfcDeepFoundation
- IfcDoor
- IfcEarthworksElement
- IfcFooting
- IfcKerb
- IfcMooringDevice
- IfcNavigationElement
- IfcPavement
- IfcPlate
- IfcRail
- IfcRailing
- IfcRamp
- IfcRampFlight
- IfcRoof
- IfcShadingDevice
- IfcSlab
- IfcStair
- IfcStairFlight
- IfcTrackElement
- IfcWall
- IfcWindow
6.1.3.18.3 Attributes
# | Attribute | Type | Description |
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IfcRoot (4) | |||
IfcObjectDefinition (7) | |||
IfcObject (5) | |||
IfcProduct (5) | |||
IfcElement (13) | |||
Click to show 34 hidden inherited attributes Click to hide 34 inherited attributes | |||
IfcMember (1) | |||
9 | PredefinedType | OPTIONAL IfcMemberTypeEnum |
Predefined generic type for a member that is specified in an enumeration. There may be a property set given for the predefined types. |
6.1.3.18.4 Formal propositions
Name | Description | ||||||
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CorrectPredefinedType |
Either the PredefinedType attribute is unset (e.g. because an IfcMemberType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
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CorrectTypeAssigned |
Either there is no member type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcMemberType. |
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6.1.3.18.5 Property sets
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Pset_ConcreteElementGeneral
- AssemblyPlace
- CastingMethod
- StructuralClass
- StrengthClass
- ExposureClass
- ReinforcementVolumeRatio
- ReinforcementAreaRatio
- DimensionalAccuracyClass
- ConstructionToleranceClass
- ConcreteCover
- ConcreteCoverAtMainBars
- ConcreteCoverAtLinks
- ReinforcementStrengthClass
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Pset_Condition
- AssessmentDate
- AssessmentCondition
- AssessmentDescription
- AssessmentType
- AssessmentMethod
- LastAssessmentReport
- NextAssessmentDate
- AssessmentFrequency
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Pset_ConstructionAdministration
- ProcurementMethod
- SpecificationSectionNumber
- SubmittalIdentifer
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Pset_ConstructionOccurence
- InstallationDate
- ModelNumber
- TagNumber
- AssetIdentifier
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Pset_DoorLiningProperties
- LiningDepth
- LiningThickness
- ThresholdDepth
- ThresholdThickness
- TransomThickness
- TransomOffset
- LiningOffset
- ThresholdOffset
- CasingThickness
- CasingDepth
- LiningToPanelOffsetX
- LiningToPanelOffsetY
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Pset_ElementKinematics
- CyclicPath
- CyclicRange
- LinearPath
- LinearRange
- MaximumAngularVelocity
- MaximumConstantSpeed
- MinimumTime
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Pset_EnvironmentalCondition
- ReferenceAirRelativeHumidity
- ReferenceEnvironmentTemperature
- MaximumAtmosphericPressure
- StorageTemperatureRange
- MaximumWindSpeed
- OperationalTemperatureRange
- MaximumRainIntensity
- SaltMistLevel
- SeismicResistance
- SmokeLevel
- MaximumSolarRadiation
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Pset_EnvironmentalImpactIndicators
- Reference
- FunctionalUnitReference
- IndicatorsUnit
- LifeCyclePhase
- ExpectedServiceLife
- TotalPrimaryEnergyConsumptionPerUnit
- WaterConsumptionPerUnit
- HazardousWastePerUnit
- NonHazardousWastePerUnit
- ClimateChangePerUnit
- AtmosphericAcidificationPerUnit
- RenewableEnergyConsumptionPerUnit
- NonRenewableEnergyConsumptionPerUnit
- ResourceDepletionPerUnit
- InertWastePerUnit
- RadioactiveWastePerUnit
- StratosphericOzoneLayerDestructionPerUnit
- PhotochemicalOzoneFormationPerUnit
- EutrophicationPerUnit
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Pset_EnvironmentalImpactValues
- TotalPrimaryEnergyConsumption
- WaterConsumption
- HazardousWaste
- NonHazardousWaste
- ClimateChange
- AtmosphericAcidification
- RenewableEnergyConsumption
- NonRenewableEnergyConsumption
- ResourceDepletion
- InertWaste
- RadioactiveWaste
- StratosphericOzoneLayerDestruction
- PhotochemicalOzoneFormation
- Eutrophication
- LeadInTime
- Duration
- LeadOutTime
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Pset_InstallationOccurrence
- InstallationDate
- AcceptanceDate
- PutIntoOperationDate
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Pset_MaintenanceStrategy
- AssetCriticality
- AssetFrailty
- AssetPriority
- MonitoringType
- AccidentResponse
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Pset_MaintenanceTriggerCondition
- ConditionTargetPerformance
- ConditionMaintenanceLevel
- ConditionReplacementLevel
- ConditionDisposalLevel
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Pset_MaintenanceTriggerDuration
- DurationTargetPerformance
- DurationMaintenanceLevel
- DurationReplacementLevel
- DurationDisposalLevel
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Pset_MaintenanceTriggerPerformance
- TargetPerformance
- PerformanceMaintenanceLevel
- ReplacementLevel
- DisposalLevel
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Pset_ManufacturerOccurrence
- AcquisitionDate
- BarCode
- SerialNumber
- BatchReference
- AssemblyPlace
- ManufacturingDate
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Pset_ManufacturerTypeInformation
- GlobalTradeItemNumber
- ArticleNumber
- ModelReference
- ModelLabel
- Manufacturer
- ProductionYear
- AssemblyPlace
- OperationalDocument
- SafetyDocument
- PerformanceCertificate
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Pset_MemberCommon
- Reference
- Status
- Span
- Slope
- Roll
- IsExternal
- ThermalTransmittance
- LoadBearing
- FireRating
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Pset_MemberTypeAnchoringBar
BRACE
- MechanicalStressType
- HasLightningRod
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Pset_MemberTypeCatenaryStay
STAY_CABLE
- AssemblyInstruction
- NominalLength
- CatenaryStayType
- NominalHeight
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Pset_MemberTypeOCSRigidSupport
MEMBER
- AssemblyInstruction
- ContactWireStagger
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Pset_MemberTypePost
POST
- NominalHeight
- ConicityRatio
- LoadBearingCapacity
- WindLoadRating
- TorsionalStrength
- BendingStrength
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Pset_MemberTypeTieBar
TIEBAR
- IsTemporaryInstallation
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Pset_PermeableCoveringProperties
- OperationType
- PanelPosition
- FrameDepth
- FrameThickness
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Pset_PrecastConcreteElementFabrication
- TypeDesignation
- ProductionLotId
- SerialNumber
- PieceMark
- AsBuiltLocationNumber
- ActualProductionDate
- ActualErectionDate
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Pset_PrecastConcreteElementGeneral
- TypeDesignation
- CornerChamfer
- ManufacturingToleranceClass
- FormStrippingStrength
- LiftingStrength
- ReleaseStrength
- MinimumAllowableSupportLength
- InitialTension
- TendonRelaxation
- TransportationStrength
- SupportDuringTransportDescription
- SupportDuringTransportDocReference
- HollowCorePlugging
- CamberAtMidspan
- BatterAtStart
- BatterAtEnd
- Twisting
- Shortening
- PieceMark
- DesignLocationNumber
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Pset_RepairOccurrence
- RepairContent
- RepairDate
- MeanTimeToRepair
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Pset_Risk
- RiskName
- RiskType
- NatureOfRisk
- RiskAssessmentMethodology
- UnmitigatedRiskLikelihood
- UnmitigatedRiskConsequence
- UnmitigatedRiskSignificance
- MitigationPlanned
- MitigatedRiskLikelihood
- MitigatedRiskConsequence
- MitigatedRiskSignificance
- MitigationProposed
- AssociatedProduct
- AssociatedActivity
- AssociatedLocation
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Pset_ServiceLife
- ServiceLifeDuration
- MeanTimeBetweenFailure
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Pset_Tolerance
- ToleranceDescription
- ToleranceBasis
- OverallTolerance
- HorizontalTolerance
- OrthogonalTolerance
- VerticalTolerance
- PlanarFlatness
- HorizontalFlatness
- ElevationalFlatness
- SideFlatness
- OverallOrthogonality
- HorizontalOrthogonality
- OrthogonalOrthogonality
- VerticalOrthogonality
- OverallStraightness
- HorizontalStraightness
- OrthogonalStraightness
- VerticalStraightness
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Pset_Uncertainty
- UncertaintyBasis
- UncertaintyDescription
- HorizontalUncertainty
- LinearUncertainty
- OrthogonalUncertainty
- VerticalUncertainty
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Pset_Warranty
- WarrantyIdentifier
- WarrantyStartDate
- IsExtendedWarranty
- WarrantyPeriod
- WarrantyContent
- PointOfContact
- Exclusions
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Pset_WindowLiningProperties
- LiningDepth
- LiningThickness
- TransomThickness
- MullionThickness
- FirstTransomOffset
- SecondTransomOffset
- FirstMullionOffset
- SecondMullionOffset
- LiningOffset
- LiningToPanelOffsetX
- LiningToPanelOffsetY
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Qto_BodyGeometryValidation
- GrossSurfaceArea
- NetSurfaceArea
- GrossVolume
- NetVolume
- SurfaceGenusBeforeFeatures
- SurfaceGenusAfterFeatures
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Qto_MemberBaseQuantities
- Length
- CrossSectionArea
- OuterSurfaceArea
- GrossSurfaceArea
- NetSurfaceArea
- GrossVolume
- NetVolume
- GrossWeight
- NetWeight
6.1.3.18.6 Concept usage
Concept | Usage | Description | |
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IfcRoot (2) | |||
IfcObjectDefinition (9) | |||
IfcObject (5) | |||
IfcProduct (18) | |||
IfcElement (44) | |||
IfcBuiltElement (3) | |||
Click to show 81 hidden inherited concepts Click to hide 81 inherited concepts | |||
IfcMember (11) | |||
Axis 3D Geometry | General |
The axis representation can be used to represent the fundamental orientation and extents of a member's body. If an IfcMaterialProfileSetUsage is used, the axis representation is used to locate the profile. In addition:
As shown in Figure 6.1.3.18.D, the axis representation can be used to represent the system length of a member that may extend past the body length of the member. ![]() As shown in Figure 6.1.3.18.H, the axis representation must be positioned at the IfcMaterialProfileSetUsage.CardinalPoint, and parallel to the IfcExtrudedAreaSolid.ExtrudedDirection. This offset between the axis line and the IfcExtrudedAreaSolid.Position must correlate with the chosen IfcMaterialProfileSetUsage.CardinalPoint. ![]() |
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Body AdvancedSweptSolid Geometry | General |
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Body Clipping Geometry | General |
Figure 6.1.3.18.F illustrates a 'Clipping' geometric representation with use of IfcBooleanClippingResult between an IfcExtrudedAreaSolid and an IfcHalfSpaceSolid to create a clipped body. ![]() When an IfcMaterialProfileSetUsage is applied, Figure 6.1.3.18.G illustrates an advanced geometric representation with use of IfcBooleanClippingResult between an IfcExtrudedAreaSolid and an IfcHalfSpaceSolid to create a clipped body, with cardinal point applied as 4 (mid-depth left). ![]() |
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Body SweptSolid Geometry | General |
When an IfcMaterialProfileSetUsage is assigned to the IfcMember:
Figure 6.1.3.18.H illustrates a 'SweptSolid' geometric representation with cardinal point applied as 1 (bottom left). If parametric profiles are used, the parameters may be interpreted to be the dimensions of the beam:
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Material Profile Set Usage | General |
Figure 6.1.3.18.E illustrates assignment of IfcMaterialProfileSetUsage and IfcMaterialProfileSet to the IfcMemberType and the IfcMember occurrence. Both the IfcMaterialProfileSet and IfcProfileDef is shared between all occurrences. ![]() Figure 6.1.3.18.I illustrates assignment of a composite profile by using IfcCompositeProfileDef for geometric representation and several IfcMaterialProfile entities within the IfcMaterialProfileSet. ![]() |
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Object Typing | General |
This concept can be applied to the following resources: |
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Product Assignment | General |
This concept can be applied to the following resources:
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Property Sets for Objects | General |
This concept can be applied to the following resources:
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Quantity Sets | General |
This concept can be applied to the following resources: |
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Spatial Containment | General |
The IfcMember, as any subtype of IfcBuiltElement, may participate alternatively in one of the two different containment relationships:
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Material Set | General |
This concept can be applied to the following resources:
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6.1.3.18.7 Formal representation
ENTITY IfcMember SUBTYPE OF (IfcBuiltElement); PredefinedType : OPTIONAL IfcMemberTypeEnum; WHERE CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcMemberTypeEnum.USERDEFINED) OR ((PredefinedType = IfcMemberTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType)); CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFC4X3_DEV_54a9de1b.IFCMEMBERTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType)); END_ENTITY;