Nuclear Blasts

[Mohoender]

Originally Posted by kalos72

And remember guys... a fire doesn't turn a concrete building to rubble.

It can depending on the amount of heat. A regular fire won't but a high temperature fire will. It will act on the metal inside the concrete pillars. If the concrete itself doesn't suffer much the action from the distorted metal will make it explode and the building will collapse. Else, it can collapse under a blowing or earthquake-like effect. If anyone as a doubt, just take a look at Ground Zero, NYC; that's probably how the entire area collapsed.

I'm not a specialist but that's how my stepfather would explain it (more or less) and he is one, and one I trust.