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| Grit1645 | Aug 14 2008, 07:31 PM |
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"Engineers and architects don't have to design steel buildings not to collapse from gravity. They already conquered gravity when they built it." - DoYouEverWonder I don't really understand what you are trying to say here. Engineers design the structure BEFORE the contractors build it, so yes, they have to DESIGN it to resist gravity. "How did the load increase even if the top did spontaneously collapse? The bottom is still carrying the same amount of load." The load increased because it began to move. The forces being applied to the non-moving components were impact forces rather than static ones, and were thus much larger. Also, once it impacted the lower portion of the building it was not distributed where it had been before. The structure is designed to carry the load in a certain configuration. If you change the configuration or arrangement of the load, the structure may no longer be able to carry it even if it weighs the same amount. |
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| Evidence of a Top-Down Explosive Demolition · World Trade Center | |
7:39 PM Nov 25
