Extinct but not forgotten Staff Member
So you are saying the resulting torque at impact of the falling 15 stories twisted all 95 floors of independently bolted gutters/support columns either all at once or perfectly, one at a time, to result in a near perfect symmetrical descent??What do you mean then? Build some buildings and try to push them over?
And isn't it pretty obvious by looking at it? You could do the math, but it does not really seem needed. It's just torque. The long spans are, well, longer, so when a turning force is applied to them there's huge torque on the connections and then the connection break. The building is also a lot bigger than the small examples you show, so that also results in way more force.
And with the WTC compared to your toppling buildings, it's more like this: