Why the Steel structures of the WTC towers dissaperar or evaporated like by magical?
& Why the Main Stream media rejects all Consopiracy Theories that involves Israel? http://wtc.nist.gov/pubs/factsheets/faqs...
Jet fuel burns at 800° to 1500°F, not hot enough to melt steel (2750°F). However, experts agree that for the towers to collapse, their steel frames didn't need to melt, they just had to lose some of their structural strength--and that required exposure to much less heat. "I have never seen melted steel in a building fire," says retired New York deputy fire chief Vincent Dunn, author of The Collapse Of Burning Buildings: A Guide To Fireground Safety. "But I've seen a lot of twisted, warped, bent and sagging steel. What happens is that the steel tries to expand at both ends, but when it can no longer expand, it sags and the surrounding concrete cracks."
"Steel loses about 50 percent of its strength at 1100°F,
What secret material was used in the demolition?
2007-04-20 16:10:18 · 5 answers · asked by Rikjard M 2 in Science & Mathematics ➔ Engineering
LOL! Can't be bother to answer your Q.
2007-04-20 17:45:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
It seems like you answered your own question, the heat weakened the frames sufficiently and they gave way under their own weight. The structures did not disappear, did not melt, and did not evaporate. As for what Bush knows, I would think it is fortunate that he knows where his butt it, or there would a lot of brown spots all over the place. As for an Israel conspiracy theory, there are Anti-Semites who would believe anything about Israel except the truth.
2007-04-20 16:18:37 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
While the temperature may not have been hot enough to melt steel, it was high enough to anneal it, and remove some of its thermally developed properties.
I'd also like to point out that regardless of heat treat, steel will bend/deflect the same amount while in the elastic region.
Thermal properties have nothing to do with young's modulus (elastic).
2007-04-20 21:17:22 · answer #3 · answered by pickapop85 2 · 0⤊ 0⤋
ok shinebox,
when metal is stressed beyond its yield point and heated at the same time, its strength decays exponentially, look at a stress or strain diagram of any metal
2007-04-20 16:22:00 · answer #4 · answered by Pat 2 · 0⤊ 0⤋
yawn....
2007-04-20 16:51:18 · answer #5 · answered by MarkG 7 · 0⤊ 0⤋