Cloggy
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The temperatures due to jetfuel are too hot to melt steel. Research showed that steel would have lost maximum 50% strength, which is not enough to make it fail.I got an e-mail back and he said it would have not mattered if the towers had a core or no core. He said that the planes flew at top speed on full tanks and crashed into the towers and then it became way too hot...
A pancake effect would have the main core still standing. Also, a pancake effect would make the towers collapse far slower than it did. (Hence the two figures I posted ) and with the side of the building damaged, why would it not topple!..then the towers dropped with the pancake effect after being very hot for so long. The towers at the top alone weighs like 100 - 200 tons and that is enough if dropped onto a building will crush the building right down to its roots.
A wire is in tesion, so cutting it would accelerate it to the bottom. A core holding a building is in compression and will not do as your friend described. Apart from that, the core would not be hot. Steel transfers heat very easily, removing heat away from the source. Themperatures would not reach melting temperatures and steel does not snap. Heat will reduce it's strength, it will not make it snap..Even with a core, all it had to do was burn really very hot then snap and the buildings just crash hurling straight down and people died that day. The core burning so hot acts like a scissor and you cut the wire, what happens ? the wire below you drops to the table right ?
So, have your friend read this and tell me what he thinks of it.then you release the another wire in your hand and it goes just about straight to the center. That is what happened that day.
If he is the expert his initials indicate, he would know (or can easily find out) the maximum burning temperature of jetfuel, the melting temperature of steel, and reduction of strength due to heating of steel.
I am surprised that he compares the core of a skyscraper to a string in tension. That is completely wrong.