Thus, the failure of the steel was due to two factors: loss of strength due to the temperature of the fire, and loss of structural integrity due to distortion of the steel from the non-uniform temperatures in the fire.

While it was impossible for the fuel-rich, diffuse-flame fire to burn at a temperature high enough to melt the steel, its quick ignition and intense heat caused the steel to lose at least half its strength and to deform, causing buckling or crippling. This weakening and deformation caused a few floors to fall, while the weight of the stories above them crushed the floors below, initiating a domino collapse.

It is known that structural steel begins to soften around 425°C and loses about half of its strength at 650°C.4 This is why steel is stress relieved in this temperature range. But even a 50% loss of strength is still insufficient, by itself, to explain the WTC collapse. It was noted above that the wind load controlled the design allowables. The WTC, on this low-wind day, was likely not stressed more than a third of the design allowable, which is roughly one-fifth of the yield strength of the steel. Even with its strength halved, the steel could still support two to three times the stresses imposed by a 650°C fire.

The additional problem was distortion of the steel in the fire. The temperature of the fire was not uniform everywhere, and the temperature on the outside of the box columns was clearly lower than on the side facing the fire. The temperature along the 18 m long joists was certainly not uniform. Given the thermal expansion of steel, a 150°C temperature difference from one location to another will produce yield-level residual stresses. This produced distortions in the slender structural steel, which resulted in buckling failures. Thus, the failure of the steel was due to two factors: loss of strength due to the temperature of the fire, and loss of structural integrity due to distortion of the steel from the non-uniform temperatures in the fire.

It is known that structural steel begins to soften around 425°C and loses about half of its strength at 650°C.4 This is why steel is stress relieved in this temperature range. But even a 50% loss of strength is still insufficient, by itself, to explain the WTC collapse. It was noted above that the wind load controlled the design allowables. The WTC, on this low-wind day, was likely not stressed more than a third of the design allowable, which is roughly one-fifth of the yield strength of the steel. Even with its strength halved, the steel could still support two to three times the stresses imposed by a 650°C fire.

ok... Not to pick and choose but the paragraph right above that says

Thus, the failure of the steel was due to two factors: loss of strength due to the temperature of the fire, and loss of structural integrity due to distortion of the steel from the non-uniform temperatures in the fire.

Look. I dont care what the web page says.

The offical story is that the steel melted and that was what caused the "pancake domino effect"

Now the on;y question is would the impact of the plane have done the rest? With little doubt the answer is a solid no

Its a no because the plane hit before the fire damage. The impact of the plane didnt cause the collapse. Nor did the fire.

And if you have noticed, the building that fell first was the building that was hit second. And most of its jet fuel exploded outside the building. And on top of that, it hit the building on its corner, structural damage was minimum.

Look. I dont care what the web page says.

Incidently neither the FEMA or the NIST reports states that steel melted,

I dont care what anyone says.

Science dosent lie.

Come now Skibum, do you honestly not question the official line in any manner?

I've have watched numerous documentaries voicing a large array of footage and audio broadcasts most of them asking the same questions.

There are numerous questions that are asked and can be answered very simply, but the manner in which the 2 towers collapsed and the later collapse/pulling of building 7, spew a multitude of questions that remain unanswered.