Included code sections - 41.1, 41.3, 41.4, 26.5.1.5, 26.5.1.6, 26.5.1.7

Excluded code sections - 41.2

Only the "core" of a cross section is used for torsion design. See "Concrete "Core" Determination".

If the core consists of multiple ribs, then the torsion calculations are performed for an average rib:

• rib width = total core width / num ribs
• with ultimate forces scaled down by the number of ribs (/ num ribs) and capacity and reinforcement scaled back up by the number of ribs (* num ribs).
• code provisions are not applicable to multiple ribs, so to get a more exact calculation, use a separate design section or design strip for each rib.

Equivalent shear V_e is calculated per clause 41.3.1.

Equivalent bending moment M_e1 is calculated per clause 41.4.2.

Shear and torsion reinforcement is provided in accordance with clause 26.5.1.6 and 26.5.1.7.

Area of torsion reinforcement and longitudinal reinforcement is calculated in accordance with clause 41.4.

Maximum spacing of links is the least of x₁, (x₁ + y₁)/4 or 300 mm.

If torsion design is selected, at least minimum stirrups will be provided at all locations.