Originally posted by ThroatYogurt
::BREAKING NEWS::
NIST claims that the cause of the collapse was uncontrolled fires resulting in thermal expansion causing floor failures. Failure between steel and concrete. Long span steel beams. Girder on floor 13 failed, causing floor to collapse. Cascading failures. Column 79 failed.
NIST encourages engineers and architects to consider thermal expansion when designing buildings.
So? then let's consider thermal expansion.
We have Steel and we have Concrete.
What does wikipedia say?:
en.wikipedia.org...
coefficient of linear thermal expansion α [in 10-6/K at 20 °C]
Concrete 12
Steel, depends on composition 11.0 ~ 13.0
in other words concrete and steel thermal expand equal !
Now tell me how does this fit with NIST's picture of the breaking bolts due thremal stress meaning expansion difference betwenn concrete and steel if they have the same expansion coefficient?
I don't see how what NIST suggested should work.
So where is the physical model (a concrete plate with a steel beam build the same way) that shows that it is like NIST claims?








