QUOTE(aquatus1 @ Oct 23 2006, 04:44 PM) [snapback]1400817[/snapback]
The purpose of load balancing is, essentially, to shift the weight of the buidling from one support structure to another. The higher a building, the greater the need, since there is a certain level of sway to a building that needs to be taken into account the higher a building goes. Beyond this daily need for load balancing, there is also the problem of crisis management, such as fires. Engineers use load balancing for the purpose of crisis management, by designing the building to shift weight away from the weaker members during a fire.
The load balancing that you are talking about comes into play primarily in the case of earthquakes. Structures are designed to sway with the earthquake tremor slightly by means of a flexible base movement arrangement at the foundation. This allows the building to slightly sway and distribute the shock rather than staying rigid and risking collpse at weak points in the buildings.
If WTC was as meticulously planned as you believe, don't you think it should've balanced the weight properly and avoided the collapse of the undamaged parts? Only a few top floors were damaged, a well designed and engineered builing, you'd imagine would cope with it, wouldn't you? A well designed building should allow as minumum damage as possible, not get the whole stucture down.
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A building is designed with the assumption that a fire occurring within it will occur in the manner that we are accustomed to seeing fires spread, namely starting small at one specific point, and then slowly spreading outwards,
What about fires due to explosions? Gas cylinder and other fuel related explosions can cause major fires. Are you telling me that these scenarios are so unimaginable that they wouldn't be a part of a good fire disaster recovery plan?
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But what happened in the WTC? What happened there was something that had been unpredicted by anyone, and that, frankly, we likely couldn't prevent now if we wanted to.
You couldn't have predicted it:yes. You couldn't prevent the plane crashes:yes. You could've still saved a considerable part of the buildings:oh Yes!
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When the plane exploded, jet fuel covered the entire floor all at once. That means the entire floor suddenly exploded in a fiery conflagration.
You're saying an explosion at one corner of a squarish structure would distribute fuel to all the portions evenly(in such a huge area that too), causing even and regular damage to the top floors by weakening all the steel structures equally and evenly, causing them to give way simultaneously and bringing WTC straight down? Wow! This wasn't the case as we already know: the fires were irregular, the top floors burnt irregularly and the damage was irregular, and it amazes me that you still think that the fall would be regular. It also amazes me how easily you undermine the huge resistance that the outnumbering intact floors would offer to prevent the collapse.
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Controlled explosives do not mean that a building is going straight down; they mean a building is going to fall where you want it to fall.
Exactly! In the case of WTC, they wanted it to come straight down to minimise huge quantities of scattering rubble and prevent damage to other buildings around.
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The reason the towers came straight down had nothing to do with explosives, but rather with gravity. A straight down collapse is the default for anything that falls, particularly high-rises; they are simply too large to fall in any other manner.
Gravity off course aquatus1 but common sense tells us that irregularly damaged tall buildings would see a good portions of it fall sidewards down when an unplanned collapse occurs.
Take four long pins, arrange them(standing up) as in a square and place some weight on the top. Now, snap one of the pins at the top using pliers. Still expect the weight to come straight down?




