Originally posted by realityhack
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Federer/Nadal
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Originally posted by zeitghostYou've forgotten the Giant Alien Lizard contribution... we thought the War Criminal's Great Great Great Grandfather might have been there.Comment
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Originally posted by TimberWolf View PostIt would be much more difficult to achieve a lot of topple in a building the size of the towers IMO.
There are many architects and engineers who believe the same. Some have modelled this using a range of scenarios, and concluded only in favour of controlled demolition.Comment
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I dont believe the towers collapsed atall. I think it was filmed on a film set in Vegas. Or was it the moon?Comment
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Originally posted by realityhack View PostActually, their height makes them more likely to topple. The law of conservation of energy makes it very hard for me to believe it was a natural collapse. Possible, but highly improbable. And for all three?
There are many architects and engineers who believe the same. Some have modelled this using a range of scenarios, and concluded only in favour of controlled demolition.
When they built the towers they would have calculated how much it could lean to one side - which places an upper limit on the angle it could topple, gravity would take care of the rest. When the steelwork is weaked through heat, this angle would be much less. Tall buildings can't be made topple like trees, they just don't have the same strength.Comment
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Originally posted by BrilloPad View PostOr was it the moon?Comment
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Originally posted by realityhack View PostYour position has been logged. Stay where you are, the authorities are on their way, do not attempt to raise alarm, or leave the building.Comment
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Originally posted by TimberWolf View PostLOL, The law of conservation of energy
When they built the towers they would have calculated how much it could lean to one side - which places an upper limit on the angle it could topple, gravity would take care of the rest. When the steelwork is weaked through heat, this angle would be much less. Tall buildings can't be made topple like trees, they just don't have the same strength.
I see where you're coming from, but I'm not saying they should have toppled like 'trees' at all. more that upper parts of the building would be more likely to fall away and to one side, especially if the forces were uneven.
I'll have to come back to this later - lunch.Comment
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Originally posted by BrilloPad View PostBut I was in Finsbury CircusComment
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Originally posted by realityhack View PostYep, as a counter to the 'pancake theory' the FEMA report used to explain the collapse, saying the generated forces produced the neat fall.
I see where you're coming from, but I'm not saying they should have toppled like 'trees' at all. more that upper parts of the building would be more likely to fall away and to one side, especially if the forces were uneven.
I'll have to come back to this later - lunch.
To get an idea of the forces involved in toppling just have a guess. At an angle theta to the vertical, the sideways force on the framework would be on the order of m*g*sin(theta). At zero degrees this is zero in a horizontal direction, and the way things should be, downward compressive forces only. At 30 degrees the framework would have to withstand 50% of the weight of building - sideways . A tensile force in a direction it isn't designed to withstand, and only one bolt has to fail before irt collapses rather than topples. It couldn't topple much.Comment
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