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Design column moments after P-delta analysis are exceeding the code limit of 1.4 times the moments due to 1st degree analysis. Check any member by manual calculations to make sure that the change in member ( column, beams, or both) size is required. In addition, you can do following: ETABS uses a default value of 1 for effective length factors; you should revise the factor if you have stiffer beams. you can also review moment coefficient factor. make sure that unbraced length ratios are correct.