The bending strength of the section is designed to be at least 1.2 Mcr, where the cracking moment is assumed to be applied to each axis separately as uniaxial bending. No simultaneous biaxial moments are considered. The cracking moments about each axis are calculated to cause the stress in the extreme tension fiber to reach fr.

f_r is modulus of rupture calculated in accordance with section 8.6.4.

λ value is calculated according to section 8.6.5.