Definitions applying to Bridge View

 Instance diagram

This entity may be used to model barriers of constant cross-section, or architectural railings.

Barriers may be defined as a constant cross-section placed along the alignment at either edge of a bridge deck or anywhere in between.

Guard rails and barriers are modelled as IfcRailing making use of custom profiles. Such barriers are modelled very similarly to girders, where an IfcArbitraryClosedProfileDef describes the cross-section, an IfcAlignment2DVertical describes the path, and an IfcFixedReferenceSweptAreaSolid captures the 3D shape.

Figure 65 — Bridge barrier model

Railings may be connected to other railings (such as architectural railing onto guardrail) or to the slab of a bridge deck.

Concept usage

Object Typing

The Object Typing concept applies to this entity as shown in Table 45.

Type IfcRailingType

Table 45 — IfcRailing Object Typing

Exchange
Import		O
Export		O

Material Profile Set

The Material Profile Set concept applies to this entity.

For guard rails using profiles, the profile is defined using IfcArbitraryClosedProfileDef. The solid is constructed by sweeping the profile along IfcFixedReferenceSweptAreaSolid. Unlike the bridge deck, the profile of a guardrail typically does not vary along its path, so the profile can be defined statically and then swept along an alignment curve.

Exchange
Import		O
Export		O

Constraint Association

The Constraint Association concept applies to this entity.

Exchange
Import		O
Export		O

Element Decomposition

The Element Decomposition concept applies to this entity as shown in Table 46.

RelatedObjects Description IfcReinforcingBar Rebar embedded in concrete IfcCableCarrierFitting Conduit embedded in concrete IfcJunctionBox Junction boxes embedded in concrete for access to light fixture wiring IfcMember Posts, rails, and spindles comprising architectural railing

Table 46 — IfcRailing Element Decomposition

Rebar (IfcReinforcingBar) and embedded conduit (IfcCableCarrierSegment) are linked using IfcRelAggregates where RelatingElement refers to the IfcRailing.

Exchange
Import
Export

Element Positioning

The Element Positioning concept applies to this entity as shown in Table 47.

Placement Transform Description VERTICAL WARP Bridge railings are positioned and transformed to follow the alignment curve.

Table 47 — IfcRailing Element Positioning

Exchange
Import		O
Export		O

Formal representations