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Definition from buildingSMART International: Instances of the entity IfcStructuralSurfaceMember shall be used to describe planar structural elements.

The material properties are defined by IfcMechanicalMaterialProperties (and subtypes) and they are connected through IfcMaterial and IfcRelAssociatesMaterial and are accessible via the inherited inverse relationship HasAssociations.

HISTORY: New entity in Release IFC2x Edition 2.

Topology Use Definition

Instances of IfcStructuralSurfaceMember 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 IfcStructuralSurfaceMember 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.

Topology Representation

Instances of IfcStructuralSurfaceMember shall have a topology representation given by a face with an optional additional geometric representation of the included surface. It can be provided by either

which should be the single item of IfcTopologyRepresentation.Items.

EXPRESS specification:

ENTITY IfcStructuralSurfaceMember
SUPERTYPE OF (IfcStructuralSurfaceMemberVarying)
SUBTYPE OF ( IfcStructuralMember);
PredefinedType  :  IfcStructuralSurfaceTypeEnum;
Thickness  :  OPTIONAL IfcPositiveLengthMeasure;

Attribute definitions:

PredefinedType  :  Defines the type of the structural face member.
Thickness  :  Defines the typically understood thickness of the structural face member, i.e. the smallest spatial dimension of the element.

Inheritance graph

ENTITY IfcStructuralSurfaceMember;
GlobalId  :  IfcGloballyUniqueId;
OwnerHistory  :  IfcOwnerHistory;
Name  :  OPTIONAL IfcLabel;
Description  :  OPTIONAL IfcText;
ENTITY IfcObjectDefinition;
HasAssignments  :  SET OF IfcRelAssigns FOR RelatedObjects;
IsDecomposedBy  :  SET OF IfcRelDecomposes FOR RelatingObject;
Decomposes  :  SET [0:1] OF IfcRelDecomposes FOR RelatedObjects;
HasAssociations  :  SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject;
ObjectType  :  OPTIONAL IfcLabel;
IsDefinedBy  :  SET OF IfcRelDefines FOR RelatedObjects;
ENTITY IfcProduct;
ObjectPlacement  :  OPTIONAL IfcObjectPlacement;
Representation  :  OPTIONAL IfcProductRepresentation;
ReferencedBy  :  SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcStructuralItem;
AssignedStructuralActivity  :  SET OF IfcRelConnectsStructuralActivity FOR RelatingElement;
ENTITY IfcStructuralMember;
ReferencesElement  :  SET OF IfcRelConnectsStructuralElement FOR RelatedStructuralMember;
ConnectedBy  :  SET OF IfcRelConnectsStructuralMember FOR RelatingStructuralMember;
ENTITY IfcStructuralSurfaceMember;
PredefinedType  :  IfcStructuralSurfaceTypeEnum;
Thickness  :  OPTIONAL IfcPositiveLengthMeasure;