[HighWheeler]

The WTC steel beams and posts didn't have to melt for those buildings to fall. Look at the graph below. As the temperature goes up, the steel softens, and the strength of the steel to carry the load goes lower. The buildings collapsed at the moment when the strength of the hot steel was not enough to hold the load they were carrying.

It's typical to load steel no higher than 60% of the steel's room temperture strength. Look at the chart, and you will see the line cross the 60% line at about 1200F. It take 2700F to turn steel to liquid, which is not necessary .

[BocoLoco]

“It’s typical to load steel no higher than 60% of the steel’s room temperture strength. Look at the chart, and you will see the line cross the 60% line at about 1200F. It take 2700F to turn steel to liquid, which is not necessary .”

Before posting ridiculously ambiguous information on here by showing a graph which, albeit relevant to 5 floors vs 105 floors, it might be a good idea to actually read the NIST report cover to cover and get back to us on their findings.