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A P-Delta load combination of 1.2 DL + 0.5 LL is typically conservative when considering P-Delta effect due to the overall sway of a structure. Combinations (3) and (4) will accurately capture this effect, while (5) and (6) should be conservative. Combinations (1) and (2) have no lateral load, therefore P-Delta effect should not be of concern. Please notice this is anona non-linear static case and should be performed only after the structure model runs without any numerical issues for simple linear cases and results of basic variables such as deformations are within realistic or expected values.
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