Posted Oct 29, 2012, 8:49 PM
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Join Date: Jul 2012
Posts: 166
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I don't care as long as its a flowing movement. When you see a crane sway, stop dead, return to former position, then repeat, that's when you know it over. The sudden, jolting means that the energy is being absorbed in an extremely short amount of time and the Impulse [force imparted in a set time] is sending the energy somewhere.
EX: A five pound weigh swaying on the top of a dowel is fine, when you stop the dowels rotation mid-motion. the force is concentrated on the area of the fulcrum.
If the cranes are moving in a smooth fashion and the force of the rotation is spread over the length of the tower, things are good. When the cranes reach a certain point, the system will reach it's limit and the force that had been absorbed by the motion will start to be absorbed by other components that are relatively solid. like the area of the flexing tower meeting the relatively solid building. The stress is enormous, and inspections will likely take a week before the cranes can resume work. All we can hope for is that the cranes can dissipate their energy by flexing.
I hope I got this right, I'm trying to remember my physics.
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