Quote:
Originally Posted by LouisVanDerWright
I am probably off on the actual scale of the weight we are talking about here, but there is, in fact, a balancing issue. It's not active loads they are worried about, it's static loads (I think I'm using these terms correctly?), i.e. having a million more (or some large number that I have no way of properly scaling, you get the point) on one side of the building would gradually tilt it out of level. This came from someone who had a discussion directly with Jim Goettsch about this design. It's not that having a bunch of people moving to one side of the building is going to harm it, it's that having a significantly higher load on one side of the building in combination with active loads will, over time, push the thing out of true. Goettsch was looking at doing something cooler with the setbacks on the top, but the limitations I described above made it impossible.
I wish I could remember the numbers he was citing, but he also told me how many millions (I think it was like 150 million or something, but that sounds absurdly high to me) of pounds each of these struts is going to be carrying. The point is the engineering here is very impressive.
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Magnussen Klemencic is regarded as one of the top (if not THE top) tall building engineers in the world. I think they are the peer reviewer on Kingdom Tower - 4.5x the height of 150. Take a look at their office in Seattle (Google Ranier Tower, designed by MKA in 70's) and 150 N Riverside looks "normal".
150 million pounds would crumple that 65ksi column like tinfoil...Clark said the column load is like 9 kips (18 million pounds). But this engineering must be insanely complex. 18 million pounds is still about what all the steel in the entire building weighs (assuming 9000-10000 to da of steel).
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