Steel failing in hydrocarbon fires.

[alexi_drago]

This is still my favorite "heat can't damage / weaken steel"
http://www.youtube.com/watch?v=Drsgs6-3Qlg

Wasn't there another truther argument that localised heating wouldn't be possible as the heat would dissipate through the steel structure too quickly so no point could get hot enough without the entire structure being heated up, the guys in that video picked it up with their bare hands.

 

[Porpoise of Life]

What a surreal thread. Of course hydrocarbon fires can burn hot enough to deform and weaken steel. How do truthers suppose steel was worked for the two thousand years it has been in use before other means of heating it were invented?

 

[jaydeehess]

Wasn't there another truther argument that localised heating wouldn't be possible as the heat would dissipate through the steel structure too quickly so no point could get hot enough without the entire structure being heated up, the guys in that video picked it up with their bare hands.

It continued even after it was pointed out that there must be some reason that steel is protected with fire insulation. Of course steel cannot conduct heat away faster than it is coming in.

I noted that if a long steel column had some of its insulation removed at one level and then subjected to heat at that same level, the heat would not be dissipated at upper or lower levels. Insulation works for heat traveling in either direction.

 

[JSanderO]

Regardless.... the main impact of the heat from fires was frame member expansion, warping, elongation and sagging which lead to joint weakening and failures and displacement of column to column end connections.

Heat rises and so it was the lateral steel which saw the most heating.

 

[BenBurch]

What a surreal thread. Of course hydrocarbon fires can burn hot enough to deform and weaken steel. How do truthers suppose steel was worked for the two thousand years it has been in use before other means of heating it were invented?

I don't know! But they seem to reject what metallurgists have known since the Iron Age.

 

[000063]

Incidentally, I love that "jet fuel can't melt steel beams" is now a well-known meme.

 

[gumboot]

Structural steel begins losing strength at about 300 degrees, and by 550 degrees has only about 60% of room temperature yield strength and 45% stiffness. It also experiences significant thermal elongation, which disrupts structural integrity. By 800 degrees it has only about 10% of room temperature strength.

Don't really see why there's any need to progress beyond these simple facts, really.

 

[ozeco41]

Structural steel begins losing strength at about 300 degrees, and by 550 degrees has only about 60% of room temperature yield strength and 45% stiffness. It also experiences significant thermal elongation, which disrupts structural integrity. By 800 degrees it has only about 10% of room temperature strength.

Don't really see why there's any need to progress beyond these simple facts, really.

You will never make a truther.

 

[gumboot]

You will never make a truther.

Any hope of that passed long ago. The majority of my 25,000 posts have been in this subforum.