 Quote:
Originally Posted by Grace  "We know that the steel componants were certified to the ASTM E1 19. The time temperature curves for this standard require the samples to be exposed to temperatures of 2000 degrees F for several hours"
Additionaly, I think we can all agree that even unfire proofed steel will not melt until reaching red hot temperatures of nearly 3000 degree's F. Why Dr Brown would imply that 2000 degree F would melt the high grade steel used in those buildings makes no sence at all
This story just does not add up. If steel from those buildings did soften or melt, we can all agree that this was certainly not due to jet fuel fires of any kind, let alone the briefly burning fires in those towers." | Actually, steel components are not, technically speaking, "certified" in the US.
Rather, steel assemblies are tested by procedures, such as ASTM E 119, that determine the fire ratings for such assemblies.
And the assemblies that are tested in these types of tests include fire protective coatings that are meant to prolong the amount of time such assemblies can withstand a certain temperature fire before they reach a minimum set of performance characteristics (i.e. - internal stresses, deflections, etc.) that are laid out by various building, fire, and civil engineering-related codes.
And, in my professional opinion, being that I am an engineer with a mechanical and civil engineering background, anyone who claims that the strength of structural steel is not a function of temperature is rather, well, ignorant. |