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New structure on ancient columns

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I am designing a four stories steel building, for a medical center. Originally the building had two stories, but supposedly was designed for four stories. I examined the calculations, but they are very bad with a lot of mistakes. Then we designed a lateral steel building, but we need to use the space of the lift in the original concrete building, for the new lift. We designed a steel structure of two stories for the lift, and put it over the concrete columns of the building, but now, these columns need 2% of steel but they have only 1%.
Which do you think is the best method to update these columns for the new loads?
Thank you very much
Alberto Guida

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