Originally Posted by Apollo20
It would seem the actual fuel load is somewhat controversial, but even accepting the NIST estimate, I doubt that the thermal inertia of something like a floor truss will really make a huge difference, even considering the discrepancy in fuel loadings from cardington to the NIST estimate. In fact a floor beam in cardington will likely have greater thermal inertia than in the case of a WTC floor truss. This will probably only have a marked effect on the columns, which were ultimately lesss important to the collapse than the trusses.
Anyhow, the point is that Kevin Ryan stating that the steel will not exceed 250C is not good enough, a much more detailed analysis is needed than that, such as a time temperature curve for the steel element, or a heat-flux vs time curve, if he does not accept what NIST has produced.