In accordance with section 4.8.1 of the code, if the shear force demand (Fv) exceeds 60% of the Pv or Vw capacity, then the web shear, bending axial interaction is checked per H.3. There remains some uncertainty whether the code intended for this provision to apply to rolled sections. However, pending further clarification, the letter of the code as currently written has been implemented.

A reduction factor (ρ) is applied to the interaction equations only where Vw exceeds Pv. To perform this check, Vw is calculated for the section even in the case where it is not necessary for shear capacity calculations in 4.2.5.3 (d/tw < 70ε). In order to compare the section 4.8 checks (with an upper interaction limit of 1.0) to the H.3 checks (with an upper limit of 1-ρ)², RAM Frame divides the left-hand terms of the equations in H.3 by (1-ρ)². Thus all interaction values have an upper limit of 1.0 for comparison purposes.

• For RHS sections an additional internal moments are applied according to C-3 for "strut-action" and J.5.1 for moment amplification. In both these sections the engineer is allowed to reduce the additional moment depending on the location along the length of the member, relative to the buckling shape of the member. In RAM Frame the program conservatively uses the full amplification irrespective of where along the member the design moments are taken from. These moment amplifications are only performed in the case of uniaxial bending, or where minor axis moment is less than 2% of Mcy, in the RHS. In all other cases the error message "H3. Not Impl" is issued.