The minor axis bending moment is zero. So the minimum eccentricity moment is considered for both the load combos U1 and U2. In both cases the minimum eccentricity moment is 35.952 kN-m (M2,min). Then for the second order effect this moment is amplified by the Delta_ns factor. For the case of U1, this factor is 1.585. This leads to a design moment of 35.952 kN-m X 1.585 = 56.965 kN-m. For the case of U2, this factor is 3.145. This leads to a design moment of 35.952 kN-m X 4.145 = 113.070 kN-m.

It is recommended to avoid using a combination of combinations for the purpose of design. While a combination of combinations is not a problem for enveloping analysis results, it is not appropriate for design. This is because some of the design parameters are invariably dependent on the type of loading and this information is lost when combos are used within a combination.

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Strukts: Avoid Combination of combinations in Etabs Design
Avoid Combination of combinations in Etabs Design
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Strukts
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https://www.strukts.com/2013/02/avoid-combination-of-combinations-in_16.html
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