Did you actually read that, or just cherry-pick for things that kind of sounded a little bit like what you wanted to believe? Because Dr. Sunder just destroys you.
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Interestingly, dan, a floor is not the same thing as a support column. First of all, floors are horizontal. In a skyscraper, they are stacked up one on top of another. Meanwhile, support columns are vertical. They support the weight of things like floors, because there is a force between masses called gravity that tends to make things like floors fall towards the earth.
So far, other posters have been discussing how these columns had been compromised, leading to collapse; here, you have gotten the columns confused with floors. I hope my explanation clears that up.