Torsion can only be checked to the AISC or Eurocode head code and only under the following conditions:
- Section geometry
- doubly symmetric rolled I-sections
- closed RHS/SHS/CHS sections (steel and cold formed)
- closed HSS sections
- pinned
- single span beams
- applied torsion moment
- no web openings
If any of the above conditions are contravened the check is beyond scope.
Only a check design is performed, (no auto-design for torsion).
The procedure and scope are different for Open sections (I’s) vs closed sections (HSS’s)
- Open Sections:
- Torsion design and angle rotation check will be carried out for applied torsion forces only. “Inherent” torsion is not checked
- Closed Sections
- “Inherent” torsion and/or physically applied torsion loads checked
- Angle of rotation check carried out for applied forces only
