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the official story states that "fire" was the determining factor in the collapse of both towers of the wtc and bldg 7 on 9/11-- fire has NEVER caused the collapse of a concrete and steel structure not even the windsor builing which burned for over 18 hours--

Actually, that is not quite correct, or rather, it is somewhat misleading. Fire has indeed been the cause of several collapsed steel and concrete buildings, although never due to the failure of concrete enclosed steel structures. Not even in the WTC. My opponent wishes for you to believe that the official claim is that the WTC collapsed because the fire caused the concrete convered main supports to fail. This is not true.
Let's take, as an example, the Windsor Building. How can a fire burn for eighteen hours, and not collapse the structure, while the WTC burned for barely a tenth of that and collapsed? Why is this? Well, the answer requires a bit of education on how buildings, specifically high-rises, are designed to handle fires.
The way that the central support columns on a high-rise are designed to work is by
load balancing. What this means is that the tower, on a daily basis, will sway back and forth, slowly shifting its weight from one set of support columns to another. This is an expected part of tower construction, and is even taken advantage of in the engineering by providing extra column support for redundancy. That means that, if necessary, a set of columns can hold the entire weight of the building for a time if the other set of columns are in distress.
Now, a fire does distress metal, no doubt about that. The speed at which it distresses metal, however, depends on a variety of factors. As every Material Science, Architecture, and Engineering student knows, there is a long list of Fire Resistance codes that explain, in detail, how every single piece of material is to be prepared and how long it is meant to survive in a fire. A regular metal support beam is fairly weak in a fire, and will quickly sag when approximately half the heat needed for its melting point is reached. That same support beam, fireproofed with a special heat resistant foam, can last hours upon hours. That same support beam, covered with concrete, is even stronger still.
So, what happened in the Windsor Building? What happened was that a small fire started in one part of the building. That fire rapidly grew out of control. Now, what this means is that the fire grew stronger than the efforts to contain it; it does not mean that the fire spread to every other part of the building. This is a very important point. See, in the section where the fire was raging, the heat was quite intense, and the metal, protected though it was by the fire-proofing material, was still under quite some stress. Fortunately, though, the engineers took this into account; the support beams on the section of the building
that was not on fire were strong enough to keep the building up. Load balancing. When one set of beams couldn't take the full load, another stepped in to help. Now, the fire grew and did spread. As it did so, it consumed all the fuel in the original starting point, and the heat diminished substantially. This allowed the supporting structure to regain a measure a of strength; fortunately, it never sagged, due to the fire protection it had, so the building integrity remained. The new fire in the new area in turn began to once again distress the beams in that area, but now, the original beams were getting cooler and stronger, so they could, once again, start taking up the load. Again, load balancing. Eventually, the entire floor was on fire, but the thing to realize was that, after eighteen hours, pretty much all the significant fuel was all used up. Yes, it was on fire, but the fire was not very intense, and no longer a danger to the strength of the support beams.
In short, the way the building was designed was to be able to survive a fire that began in one area and eventually spread to the rest of the building, distressing the metal where it currently was, but cooling down where it had just left, so that the metal could regain its strength.
But what happened at the WTC? Well, something happened there that no engineer forsaw, and no engineer would have been able to plan against even if they had. Indeed, even today, we have no feasible solution for the problem.
What happened in the WTC towers was, when the planes crashed into them, they spilled their fuel load across the entire floor. In other words,
the entire floor suddenly and intensly went up in flames. The whole concept of load balancing was now thrown out the window. There was, quite simply, nowhere for the load to balance to. The entire floor was being weakened simultaneously, but what was worse is that the blast from the explosion ripped away the foam fire protectant that was on the support beams. No longer protected from the direct heat, the bare metal trusses began to weaken dramatically.
Now, the actual vertical support columns, concrete covered as they were, were weakened by the fire, but nowhere near the point of collapsed. It is very important to know, however, that they were at pretty much max capacity. The airliner, as it struck the building, destroyed quite a few and damaged a significant number more of them, meaning that the redundancy factor was suddenly much smaller. Still, they, they held strong. The buidling did not collapsed because the vertical columns failed due to the fire.
So, why did they fail? Remember the floor trusses, whose fire protection had been blown away by the impact, who were being directly exposed to a intense fire? They began, as everyone familiar with the effects of fire on steel knows, to sag. That means that the truss, spanning the entire floor, began to sag in the center, and in doing so, began pulling away from the wall holding it up. This caused the brackets that held them in place, designed to bear a vertical load, to fail as the load suddenly became horizontal. One by one, the floor trusses collapsed, and the entire floor fell onto the weakened floor below it, causing it to collapsed. A total of eight floor collapsed in this fashion, known to fire-fighters as "pancaking".
Our vertical support columns, weakened by fire, cut down to a bare minimum redundancy by the crash of the airliner, suddenly had the sum total weight of eight floors in close to free-fall speed crash on top of them. To absolutely no one's surprise, they failed instantly, and the WTC tower collapsed.
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this is what normally happens when a single load bearing member fails-- which would have certainly been the result of a collpase due to impact and fire


Actually, yes, this is indeed what happens, and it is reflected in the collapse of the towers. You'll note, in the many videos you see circulating, the North Tower falls straight down in the manner I described above. The other tower, however, does topple over. So does WTC7 as it collapsed. Fortunately, the sheer weight of a building is enough to ensure that it will fall into it's own footprint. Of course, the fall from several hundred feet helped as well.
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instead we have these images that do
NOT cooberate the official story in the least--
bldg 7(WHICH WAS
NOT STRUCK BY A PLANE) three hours prior to collapse

WTC 7 was reported to be on fire a little after 4:00. How does a picture of it before it was on fire show an inconsistency?
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Hard to say, considering the fire was in the lower levels and we can only see the top. But hey, nice mislead!
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notice below those are firefighters on the day of the collapse and NOT the CDI(controlled demolition inc.)clean up crew

Okay...
Why would the firefighters at the site be strange?
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what kind of fire could cause this?
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None. That was caused by several thousand tons of debris collapsing. Mislead much lately?
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or this which was taken
eight weeks AFTER the collapse and a testament to the temperatures that REALLY brought down the towers

Ah, yes, I love this picture
Damning evidence of...very little, actually.
Let's ignore that we have absolutely no idea where the picture was taken, when it was taken, by who it was taken, or anything that would lend it any sort of credibility whatsoever. Let's just assume that it is genuine.
So what?
Is it any suprise that a fire of intense heat still be hot eight days after burial? Heck, the whole kiln oven was developed under that principle. You insulate an 1800 degree fire, it's going to stay hot for a pretty long time.
What does this tell us about the temperature? Well, not much. We don't know what that thing is hanging there. We would have to know what it was to be able to make any sort of call on the temperature.
Well, at the very least we can say there was molten steel there, right? No, not just because of this picture. Honestly, to me it looks like nothing more than a red hot filing cabinet.
Does this mean there was no molten steel at the site at all? Hardly. Fires melt steel. Office buildings have
tons of steel just begging to melt. Filing cabinets, chairs, desks, lamps, look around the average office and you will find scads and scads of thin little steel fragments that will quickly melt and pool together. It is not at all uncommon in fires. A steel door will begin to warp at 600 degrees, and will begin to sag at 800. A regular filing cabinet will have long since turned into a puddle by then.
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the evidence is conclusive and i am selling nothing-- in fact it will be you pushing snake oil when you try to dismiss these images
No dismissal needed, just the facts. Misdirection is very easy to do, but the facts speak for themselves, and the facts do not support the conclusions my opponent is attempting to put forward.