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Battalion Seven Chief: "Battalion Seven ... Ladder 15, we've got two isolated pockets of fire. We should be able to knock it down with two lines. Radio that, 78th floor numerous 10-45 Code Ones."
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Add to that that the columns were held together by spandrel plates in groups of 3 . These sections were then BOLTED together in 30 ft tall sections The aircraft impact snapped the welds and bolts holding the columns in place Plane pushed its way into building Description of WTC construction - note pictures of exterior wall columns
To believe the silly little tale you are being told here, you must believe that the designers were fools and did not follow the law and design a building that could resist a serious multi-floor office fire. Note, that if the above scenario is correct then the towers would collapse in the event of any such fire. The aircraft impact plays no significant role in the sad little tale told here, only the fire.
184.108.40.206 Progression of Collapse
The fact that the towers collapsed in 8-10 seconds (essentially free-fall) is massive evidence that they were deliberately demolished. The fact that they fell at such a rate means that they did not encounter any resistance from the supposedly undamaged parts of the structure. That is, no resistance was encountered from any of the immensely strong parts of the structure that held the building up in the first place. From this one can conclude that the lower "undamaged" parts were actually very damaged (probably by a multitude of small explosive charges as in a controlled demolition).
Throughout that article all I see is a guy inserting bits here and there about what "he thought" should have been done, then putting opinion after opinion on the FACTS. These guys were describing the layout of the floor trusses and the guy says something like "why didn't they design it like 'this?' it would have been way more stable for no extra cost." In other words, he is admitting that the towers weren't built the best way that they could have.
We're not calling the original engineers idiots, but they couldn't have anticipated an event like 9/11 in their constructions. Before you jump out and say "but! but! I thought they built it to withstand multiple immmpaacctssss!" Yes, impacts alone, fires alone, but not an impact of the size it was coupled with the fires that were not evenly flaming office fires. The steel was hotter on one side than others.
The buildings' signature architectural design feature was the vertical fenestration, the predominant element of which was a series of closely spaced built-up box columns. At typical floors, a total of 59 of these perimeter columns were present along each of the flat faces of the building. These columns were built up by welding four plates together to form an approximately 14-inch square section, spaced at 3 feet 4 inches on center. Adjacent perimeter columns were interconnected at each floor level by deep spandrel plates, typically 52 inches in depth. In alternate stories, an additional column was present at the center of each of the chamfered building corners. The resulting configuration of closely spaced columns and deep spandrels created a perforated steel bearing-wall frame system that extended continuously around the building perimeter.
Construction of the perimeter-wall frame made extensive use of modular shop prefabrication. In general, each exterior wall module consisted of three columns, three stories tall, interconnected by the spandrel plates, using all-welded construction. Cap plates were provided at the tops and bottoms of each column, to permit bolted connection to the modules above and below. Access holes were provided at the inside face of the columns for attaching high-strength bolted connections. Connection strength varied throughout the building, ranging from four bolts at upper stories to six bolts at lower stories. Near the building base, supplemental welds were also utilized.
At the central zone of impact corresponding to the airplane fuselage and engines, at least five of the prefabricated, three-column sections that formed the exterior walls were broken loose of the structure, and some were pushed inside the building envelope.
Locally, floors supported by these exterior wall sections appear to have partially collapsed, losing their support along the exterior wall. Away from this central zone, in areas impacted by the outer wing structures, the exterior columns were fractured by the force of the collision. Interpretation of photographic evidence suggests that from 31 to 36 columns on the north building face were destroyed over portions of a four-story range. Partial collapse of floors in this zone appear to have occurred over a horizontal length of wall of approximately 65 feet, while floors in other portions of the building appear to have remained intact. Figure 2-16 shows the damage to the exterior columns on the impacted face of WTC 1.