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Values of f between the limits of Alu and 2c may be chosen provided that the design torsional moment, TSd, does not exceed the torsional moment that can be resisted by the concrete compression struts.

3.4.4.3 Torsional moments

Sd.tot

This total moment is shared between the flanges and web in proportion to their torsional stiffness.

Sd.fl QJ

7gd must satisfy the following two conditions 4.3.3.1(5)

Eqn 4.39

3.4.4.4 Torsion in flanges

Re-arranging gives

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