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Originally posted by foxhoundone
This picture struck me first off, I thought it looked bad in there but on reflection, Could it have gotten as hot as they say to melt the steel inner columns..??
Originally posted by foxhoundone
Could it have gotten as hot as they say to melt the steel inner columns..??
Originally posted by Ulala
I've always wanted to know one thing.
The second last photo in the Daily Mail link, bottom left hand side, the ash almost seems fountain-like in the way it's being created then falling, how was that explained ?
Originally posted by foxhoundone
How could the fires weaken these "approx" 48 vertical beams,
WTC 5 appeared to have typical combustible contents for an office building, including furnishings, paper, etc. No evidence of any other type of fire load was noted. There appeared to be local concentrations of heavier fire loads, such as file storage, in some areas of the floors that exceeded the average combustible fire load normally associated with office occupancies. A raised sub-floor was present in a portion of the 6th floor, indicative of a computer room or electronic equipment area.
WTC 5 was damaged by impact and subsequent fires. The impact damage areas in WTC 5 are shown in Figure 4-6. The debris damage caused localized collapses from the roof to the 3rd floor in most of the areas where exterior columns impacted the structure. Ensuing fires that burned unchecked in the building caused a localized collapse from the 9th floor to the 4th floor. Figure 4-7 diagrammatically shows the damaged and collapsed areas of WTC 5 due to impact and fire.
ABC News filed a Freedom of Information Act request on August 14, 2009 to obtain the volumes of pictures and video that NIST had collected. After months of review and collection by NIST, ABC News was provided with 2,779 pictures on nine CDs.
The scarcity of physical evidence that is typically available in place for reconstruction of a disaster led to the following approach: • Accumulation of copious photographic and video material. With the assistance of the media, public agencies and individual photographers, NIST acquired and organized nearly 7,000 segments of video footage, totaling in excess of 150 hours and nearly 7,000 photographs representing at least 185 photographers. This guided the Investigation Team’s efforts to determine the condition of the buildings following the aircraft impact, the evolution of the fires, and the subsequent deterioration of the structure.
Originally posted by JIMC5499
I've said it before and I'll say it again.
The tower's structure was severely damaged by the impact of the planes. Some of the damaged structural members load was transferred to the undamaged members increasing their loading. The heat generated by the fire was enough to reduce the Yield Strength of these members to their failure point. The steel DID NOT have to melt for this failure to occurr.