[IFC] What is the use case of IFCSTRUCTURALLOADGROUP LOAD_GROUP?

Martin156131Martin156131
in General

I understand IFCSTRUCTURALLOADCASE LOAD_CASE and IFCSTRUCTURALLOADGROUP LOAD_COMBINATION, however for what reason should I use IFCSTRUCTURALLOADGROUP LOAD_GROUP?

See this example IFC: https://github.com/IfcOpenShell/analysis-models/blob/1e51add7d6648b011ff9c5d0802ecaccc1d4c6ad/ifcFiles/beam_01.ifc

I found it redundant.

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Comments

  • cvillagrasacvillagrasa

    Indeed, it appears to be redundant. It looks like this has evolved over the different schema versions, and from IFC4 onwards it is recommended to only use load cases and load groups, altogether with IfcRelAssignsToGroupByFactor.

    Here you can read a bit more about the deprecation of LOAD_COMBINATION for IfcStructuralLoadGroup[PredefinedType]:
    https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcLoadGroupTypeEnum.htm

    Martin156131
  • Martin156131Martin156131

    I didn't see the note about deprecation. Thank you for pointing it out.

    So one or more forces (for example, Point load: IFCSTRUCTURALPOINTACTION) are grouped together in a load group with IFCRELASSIGNSTOGROUP. One or more load groups are grouped in a load case with IFCRELASSIGNSTOGROUP. One or more load cases can be grouped together with IfcRelAssignsToGroupByFactor with a factor. How can we make that load case A has a factor of 1.25 and load case B has a factor of 1.5 and load case C has a factor of 1 in one load combination? In another load combination, load case A has a factor 1 and load case C has a factor 1.5

    Arv
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