It is not possible for the beams to have expanded much more than 4.67 inches though. And NIST said that when they got to 5.5 inches the girder failed. But then they found that was a 'typo' when challenged and changed it to 6.25 inches, which is impossible as they say that steel sags at over 600C. So what we have learnt here is that NIST are not very good at reading structural drawings, doing math, or citing correct initiating events., amongst other things.
How does NIST calculate 6.25 inches expansion. If they fixed a "typo" from 5.5in did they change the calculation?