Definition from buildingSMART: Instances of the entity IfcStructuralCurveMember shall be used to describe linear structural elements. Profile and material properties are defined by using objectified relationships:
HISTORY: New entity in Release IFC2x Edition 2.
topological (or axis) representation of the
structural curve member is given by assigning an edge through the
capability inherited by IfcProduct.
For linear structural curve members the use of IfcEdge is sufficient, since a linear interpolation between the two vertices is assumed, if the structural curve member is an arc, or other non-linear form, the IfcEdgeCurve needs to be used instead, having the geometric form of the curve between the two vertices fully defined.
A single, constant, profile definition is assigned to the structural curve member through the IfcRelAssociatedProfileProperties.
Topology Use Definition
Instances of IfcStructuralCurveMember shall have a topology representation. It includes a placement and a product representation. The IfcProductRepresentation shall be given by an item of Representations being of type "IfcTopologyRepresentation".
The placement for IfcStructuralCurveMember is determined at its supertype IfcProduct. It is defined by the optional IfcObjectPlacement, referenced by ObjectPlacement at IfcProduct, which establishes, if given, the object coordinate system that is referenced by all topological representations of that product.
Instances of IfcStructuralCurveMember shall have a topology representation given by an edge with an optional additional geometric representation of the included curve. It can be provided by either
which should be the single item of IfcTopologyRepresentation.Items. The IfcEdge might be referenced by two or many IfcSubedge, representing sections of the IfcStructuralCurveMember with changing properties. See subtype IfcStructuralCurveMemberVarying for the use definition.
|PredefinedType||:||Defines the type of the structural curve member.|