IfcStructuralCurveMember, anchored to a storey for its ObjectPlacement.
IfcStructuralLinearAction + its IfcStructuralLoadLinearForce — no storey anchor.
IfcStructuralLoadGroup or IfcStructuralLoadCase (picked by params.SelfWeightCoefficients) — no storey anchor.
IfcStructuralPointAction + its IfcStructuralLoadSingleForce — no storey anchor (see structural-action.ts).
IfcStructuralPointConnection, anchored to a storey for its ObjectPlacement.
IfcRelAssignsToGroup — members/connections into an analysis model, or activities into a load group.
IfcRelConnectsStructuralActivity applying an action/reaction to the member or connection it acts on.
IfcStructuralAnalysisModel— no storey anchor (IfcGroup, notIfcProduct).