IFC 4.3.x development

8.19.3.19 IfcStructuralLoadTemperature

Change log

IFC4

modificationsattributes DeltaT_Constant nameChanged from DeltaT_Constant to DeltaTConstant
modificationsattributes DeltaT_Y name Changed from DeltaT_Y to DeltaTY
modificationsattributes DeltaT_Z name Changed from DeltaT_Z to DeltaTZ

8.19.3.19.1 Semantic definitions at the entity

An instance of the entity IfcStructuralLoadTemperature shall be used to define actions which are caused by a temperature change. As shown in Figure 1, the change of temperature is given with a constant value which is applied to the complete section and values for temperature differences between outer fibres of the section.

HISTORY  New entity in IFC2x2.

"Structural load temperature"

8.19.3.19.1 Attributes

#Attribute Type Description
IfcStructuralLoad
1Name OPTIONAL IfcLabel Optionally defines a name for this load.
IfcStructuralLoadOrResult
IfcStructuralLoadStatic
IfcStructuralLoadTemperature
2DeltaTConstantOPTIONAL IfcThermodynamicTemperatureMeasureTemperature change which affects the complete section of the structural member, or the uniform portion of a non-uniform temperature change.

> NOTE  A positive value describes an increase in temperature. I.e. a positive constant temperature change causes elongation of a member, or compression in the member if there are respective restraints.
3DeltaTY OPTIONAL IfcThermodynamicTemperatureMeasureNon-uniform temperature change, specified as the difference of the temperature change at the outer fibre of the positive y direction minus the temperature change at the outer fibre of the negative y direction of the analysis member.

> NOTE  A positive non-uniform temperature change in y induces a negative curvature of the member about z, or a positive bending moment about z if there are respective restraints. y and z are local member axes.
4DeltaTZ OPTIONAL IfcThermodynamicTemperatureMeasureNon-uniform temperature change, specified as the difference of the temperature change at the outer fibre of the positive z direction minus the temperature change at the outer fibre of the negative z direction of the analysis member.

> NOTE  A positive non-uniform temperature change in z induces a positive curvature of the member about y, or a negative bending moment about y if there are respective restraints. y and z are local member axes.

8.19.3.19.2 Entity inheritance

dot_inheritance IfcStructuralLoadTemperature IfcStructuralLoadTemperature IfcStructuralLoadStatic IfcStructuralLoadStatic IfcStructuralLoadTemperature->IfcStructuralLoadStatic IfcStructuralLoadStatic_children 4 more... IfcStructuralLoadStatic_children->IfcStructuralLoadStatic IfcStructuralLoadOrResult IfcStructuralLoadOrResult IfcStructuralLoadStatic->IfcStructuralLoadOrResult IfcSurfaceReinforcementArea IfcSurfaceReinforcementArea IfcSurfaceReinforcementArea->IfcStructuralLoadOrResult IfcStructuralLoad IfcStructuralLoad IfcStructuralLoadOrResult->IfcStructuralLoad IfcStructuralLoadConfiguration IfcStructuralLoadConfiguration IfcStructuralLoadConfiguration->IfcStructuralLoad

8.19.3.19.3 Formal representations

ENTITY IfcStructuralLoadTemperature
 SUBTYPE OF (IfcStructuralLoadStatic);
	DeltaTConstant : OPTIONAL IfcThermodynamicTemperatureMeasure;
	DeltaTY : OPTIONAL IfcThermodynamicTemperatureMeasure;
	DeltaTZ : OPTIONAL IfcThermodynamicTemperatureMeasure;
END_ENTITY;