1.1.3 Structural Analysis

This exchange provides a structural analysis model for a bridge design. It may be generated as part of the design and review process for original construction, or may be generated later in evaluating or maintaining existing bridges.

Information captured within this exchange includes the following:

• Project identifying information
• Bridge identifying information
• Physical model of bridge elements and connections (see Plan Exchange)
• Bridge systems organizing bridge elements (deck, superstructure, substructure)
• Structural analysis models corresponding to bridge systems
• Structural members (curves, surfaces, volumes), shape properties, material properties
• Structural connections and boundary conditions
• Structural loads (point, curve, or surface-based forces and moments)
• Structural load cases and combinations
• Structural design methodology applied, load factors, resistance factors, finite element intervals
• Structural results (deflections and maximum stresses at each member)
• Physical elements selected and placed according to load requirements

NOTE  This exchange currently provides minimal information to be useful for the downstream Design Plans exchange; it is anticipated to be elaborated in a future extension.

Structural Analysis
Entity/Concept	Attributes	Constraints	I	E
IfcBeam
Structural Curve Assignment	ReferencedBy		R	R
Element Positioning	PositionedFrom	Placement Transform Description VERTICAL WARP Bridge girders are positioned and transformed to follow the alignment curve. VERTICAL PLACE Bridge cap beams and diaphragms are positioned without transformation.	O	O
IfcCivilElement
Product Assignment	ReferencedBy	Type Description IfcStructuralCurveMember Idealized representation(s) of element for structural analysis of piers with constant cross-section. IfcStructuralSurfaceMemberVarying Idealized representation(s) of element for structural analysis of piers with varying cross-section. IfcTask Tasks assigned to bridge components indicating applicable construction phases	R	R
IfcMaterial
Property Sets for Objects	PredefinedType IsDefinedBy	PredefinedType Name Properties   Pset_MaterialCommon Single Value Name Value MolecularWeight IfcMolecularWeightMeasure Porosity IfcNormalisedRatioMeasure MassDensity IfcMassDensityMeasure   Pset_MaterialConcrete Single Value Name Value CompressiveStrength IfcPressureMeasure MaxAggregateSize IfcPositiveLengthMeasure AdmixturesDescription IfcText Workability IfcText WaterImpermeability IfcText ProtectivePoreRatio IfcNormalisedRatioMeasure   Pset_MaterialMechanical Single Value Name Value DynamicViscosity IfcDynamicViscosityMeasure YoungModulus IfcModulusOfElasticityMeasure ShearModulus IfcModulusOfElasticityMeasure PoissonRatio IfcPositiveRatioMeasure ThermalExpansionCoefficient IfcThermalExpansionCoefficientMeasure   Pset_MaterialSteel Single Value Name Value YieldStress IfcPressureMeasure UltimateStress IfcPressureMeasure UltimateStrain IfcPositiveRatioMeasure HardeningModule IfcModulusOfElasticityMeasure ProportionalStress IfcPressureMeasure PlasticStrain IfcPositiveRatioMeasure	R	R
IfcPlateType
Type Body SweptSolid Extruded Arbitrary Geometry	RepresentationMaps		O	O
Type Body SweptSolid Extruded Arbitrary Void Geometry	RepresentationMaps		O	O
IfcProfileDef
Property Sets for Objects	PredefinedType IsDefinedBy	PredefinedType Name Properties   Pset_ProfileMechanical Single Value Name Value MassPerLength IfcMassPerLengthMeasure CrossSectionArea IfcAreaMeasure Perimeter IfcPositiveLengthMeasure MinimumPlateThickness IfcPositiveLengthMeasure MaximumPlateThickness IfcPositiveLengthMeasure CentreOfGravityInX IfcLengthMeasure CentreOfGravityInY IfcLengthMeasure ShearCentreZ IfcLengthMeasure ShearCentreY IfcLengthMeasure MomentOfInertiaY IfcMomentOfInertiaMeasure MomentOfInertiaZ IfcMomentOfInertiaMeasure MomentOfInertiaYZ IfcMomentOfInertiaMeasure TorsionalConstantX IfcMomentOfInertiaMeasure WarpingConstant IfcWarpingConstantMeasure ShearDeformationAreaZ IfcAreaMeasure ShearDeformationAreaY IfcAreaMeasure MaximumSectionModulusY IfcSectionModulusMeasure MinimumSectionModulusY IfcSectionModulusMeasure MaximumSectionModulusZ IfcSectionModulusMeasure MinimumSectionModulusZ IfcSectionModulusMeasure TorsionalSectionModulus IfcSectionModulusMeasure ShearAreaZ IfcAreaMeasure ShearAreaY IfcAreaMeasure PlasticShapeFactorY IfcPositiveRatioMeasure PlasticShapeFactorZ IfcPositiveRatioMeasure	R	R
IfcProject
Project Declaration	Declares Phase ObjectType LongName	Type Description IfcProjectLibrary Referenced projects incorporated into this project. IfcTypeObject Type definitions defined by this project. IfcActor Actors participating in this project. IfcCostSchedule Quantity takeoff schedules. IfcTask Stages of bridge construction, assigned to corresponding girder framing. IfcStructuralAnalysisModel Structural analysis model with sufficient detail to describe load combinations and results for camber ordinates, but not necessarily full result details. IfcDistributionSystem Distribution systems for drainage or electrical conduit	R	R
Project Units	UnitsInContext Phase ObjectType LongName	DerivedUnitType Description Length unit as meters, millimeters, or inches.	R	R
Project Representation Context	RepresentationContexts Phase ObjectType LongName	ContextIdentifier ContextType Description Model 3D Context for all 3D geometry. Plan 2D Context for all 2D annotations.	R	R
IfcRoot
Object Ownership	OwnerHistory		O	O
IfcSlab
Element Positioning	PositionedFrom	Placement Transform Description VERTICAL WARP Bridge decks are positioned and transformed to follow the alignment curve.	O	O
Structural Surface Assignment	ReferencedBy		R	R
IfcStructuralAnalysisModel
Group Assignment	IsGroupedBy	RelatedType Description IfcStructuralPointConnection Structural connections which may correspond to ground supports, bearings, and field splices IfcStructuralCurveMember Structural members with constant profile IfcStructuralCurveMemberVarying Structural members with varying profile IfcStructuralCurveConnection Structural connections between members IfcStructuralSurfaceMember Structural surface members with constant thickness IfcStructuralSurfaceMemberVarying Structural surface members with varying thickness IfcStructuralSurfaceConnection Structural connections between surfaces	R	R
Structural Analysis Model Attributes	LoadedBy HasResults		R	R
IfcStructuralLoadCase
Group Assignment	IsGroupedBy	RelatedType Description IfcStructuralPointAction Loads modeled as points IfcStructuralCurveAction Loads modeled as curves IfcStructuralSurfaceAction Loads modeled as surfaces IfcStructuralLoadCase	R	R
IfcStructuralLoadGroup
Group Assignment	IsGroupedBy	RelatedType IfcStructuralLoadCase	R	R
IfcStructuralPointConnection
Reference Topology	Representation	Topology IfcVertexPoint	R	R
Structural Point Connection Attributes	AppliedCondition		R	R
IfcStructuralResultGroup
Group Assignment	IsGroupedBy	RelatedType Description IfcStructuralPointReaction Reactions occuring as points IfcStructuralCurveReaction Reactions occuring as curves IfcStructuralSurfaceReaction Reactions occuring as surfaces	R	R
IfcStructuralSurfaceMember
Reference Topology	Representation	Topology IfcFaceSurface	R	R
Structural Connectivity	ConnectedBy	StructuralConnection Description IfcStructuralCurveConnection Connections to curve members along edge(s) of surface. IfcStructuralSurfaceConnection Connections to surface members within face(s) of surface.	R	R