The second order analysis method (P-Delta) is available to directly calculate the second order moments (assumed to be equivalent to k_AMP x Sway Moment). By indicating that a P-delta analysis be performed (see RAM Frame Analysis Criteria) for a sway member, the user is effectively implementing the moment amplification method. The design assumptions are as follows. For each load combination, design moments will be calculated for the gravity (non-sway), and lateral (sway) load cases independently. That is, the sum of all gravity load case moments is stored separately from those of the lateral load cases in the combination.

• Per 4.8.3.3.4 the factors mx, my and myx, are only applied to the non-sway (gravity) moments. That is terms of the form mM are replaced by Msway + mMnonsway. Note that Msway will already be amplified as it is calculated from a second order analysis, and no kamp term is applied.
• If the effective lengths are calculated per Annex E then RAM Frame will use the non-sway mode in-plane effective length factors.
• No lower limit of 0.85 will be placed on the magnitude of mx, my and myx .

Using this approach any kamp assignments made to the member are ignored.