NEVER FORGET: JET FUEL MELT STEEL BEAMS BUT NOT PASSPORT PAPER
(media.greatawakening.win)
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Having done a great deal of structural fire restoration, yes, I've had to replace steel beams and only a few wood joists where the fire was hottest. The steel beam only needs to be compromised in a very small section to ruin it's integrity for the entire piece
It seems counterintuitive until knowing the science. Being a fire service instructor and having gone through the basic fire classes when first getting into the service, combined with a mech engineering background, it’s critical that FFs know the science regarding steel beam construction.
This is one of the reasons strip malls are so dangerous during fires. The fabricated steel trusses fail at surprisingly low fire intensities.
Thanks for the added info.