Quote:
Originally Posted by aico
(Post 12985264)
I don't have TV or Cable. You're funny. You obviously know absolutely nothing about building construction.
Your biggest argument is calling people stupid, congratulations on a huge victory you intellectual giant. But, I am glad you admit your answers are on the same level as that of a Highschool Freshman.
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You are stupid if you consistently ignore obvious facts and realities that stare you in the face and instead fabricate a bunch of BS:
WTC 7 Collapse
Claim: Seven hours after the two towers fell, the 47-story WTC 7 collapsed. According to 911review.org: "The video clearly shows that it was not a collapse subsequent to a fire, but rather a controlled demolition: amongst the Internet investigators, the jury is in on this one."
FACT: Many conspiracy theorists point to FEMA's preliminary report, which said there was relatively light damage to WTC 7 prior to its collapse. With the benefit of more time and resources, NIST researchers now support the working hypothesis that WTC 7 was far more compromised by falling debris than the FEMA report indicated. "The most important thing we found was that there was, in fact, physical damage to the south face of building 7," NIST's Sunder tells PM. "On about a third of the face to the center and to the bottom ? approximately 10 stories ? about 25 percent of the depth of the building was scooped out." NIST also discovered previously undocumented damage to WTC 7's upper stories and its southwest corner.
NIST investigators believe a combination of intense fire and severe structural damage contributed to the collapse, though assigning the exact proportion requires more research. But NIST's analysis suggests the fall of WTC 7 was an example of "progressive collapse," a process in which the failure of parts of a structure ultimately creates strains that cause the entire building to come down. Videos of the fall of WTC 7 show cracks, or "kinks," in the building's facade just before the two penthouses disappeared into the structure, one after the other. The entire building fell in on itself, with the slumping east side of the structure pulling down the west side in a diagonal collapse.
According to NIST, there was one primary reason for the building's failure: In an unusual design, the columns near the visible kinks were carrying exceptionally large loads, roughly 2000 sq. ft. of floor area for each floor. "What our preliminary analysis has shown is that if you take out just one column on one of the lower floors," Sunder notes, "it could cause a vertical progression of collapse so that the entire section comes down."
There are two other possible contributing factors still under investigation: First, trusses on the fifth and seventh floors were designed to transfer loads from one set of columns to another. With columns on the south face apparently damaged, high stresses would likely have been communicated to columns on the building's other faces, thereby exceeding their load-bearing capacities.
Second, a fifth-floor fire burned for up to 7 hours. "There was no firefighting in WTC 7," Sunder says. Investigators believe the fire was fed by tanks of diesel fuel that many tenants used to run emergency generators. Most tanks throughout the building were fairly small, but a generator on the fifth floor was connected to a large tank in the basement via a pressurized line. Says Sunder: "Our current working hypothesis is that this pressurized line was supplying fuel [to the fire] for a long period of time."
WTC 7 might have withstood the physical damage it received, or the fire that burned for hours, but those combined factors ? along with the building's unusual construction ? were enough to set off the chain-reaction collapse.
Here is an realistic look at what may have happened:
http://wtc.nist.gov/media/Scheuerman...entDec2006.pdf
Anyway here is more from Wikipedia:
The report did not reach final conclusions about the cause of the collapse, but listed several issues requiring further investigation. FEMA made these findings:
Loss of structural integrity was likely a result of weakening caused by fires on the 5th to 7th floors. The specifics of the fires in WTC 7 and how they caused the building to collapse remain unknown at this time. Although the total diesel fuel on the premises contained massive potential energy, the best hypothesis has only a low probability of occurrence. Further research, investigation, and analyses are needed to resolve this issue. [Ch. 5, p. 31.]
In response to FEMA's concerns, the Commerce Department?s National Institute of Standards and Technology (NIST) was authorized to lead a three-year, US$16 million investigation into the structural failure and collapse of the World Trade Center twin towers, as well as 7 World Trade Center.[27] The investigation, led by Dr S. Shyam Sunder, drew not only upon in-house technical expertise, but also the knowledge of several outside private institutions, including the Structural Engineering Institute of the American Society of Civil Engineers (SEI/ASCE), the Society of Fire Protection Engineers (SFPE), the National Fire Protection Association (NFPA), the American Institute of Steel Construction (AISC), the Council on Tall Buildings and Urban Habitat (CTBUH), and the Structural Engineers Association of New York (SEAoNY).[28]
NIST has released a video and still-photo analysis of Building 7 before its collapse that appears to indicate a greater degree of structural damage from falling debris than originally assumed by FEMA. Specifically, NIST's interim report on 7 WTC displays photographs of the southwest façade of the building that show it to have significant damage. The report also highlights a 10-story gash in the center of the south façade, toward the bottom, extending approximately a quarter of the way into the interior.[29][3] A unique aspect of the design of 7 WTC was that each outer structural column was responsible for supporting 2,000 sq ft (186 m²) of floor space, suggesting that the simultaneous removal of a number of columns severely compromised the structure's integrity.[30] Consistent with this theory, news footage shows cracking and bowing of the building's east wall immediately before the collapse, which began at the penthouse floors.[3] In video of the collapse, taken from the north by CBS News and other news media, the first visible sign of collapse is movement in the east penthouse 8.2 seconds before the north wall began to collapse, which took at least another 7 seconds.[3][31]
A progress report was released in June 2004, outlining NIST's working hypothesis.[32][3] The hypothesis, which was reiterated in a June 2007 status update, is that an initial failure in a critical column occurred below the 13th floor, caused by damage from fire and/or debris induced structural damage of a critical column, from the collapse of the two main towers. The collapse progressed vertically up to the east mechanical penthouse. The interior structure was unable to handle the redistributed load, resulting in horizontal progression of the failure across lower floors, particularly the 5th to 7th floors. This resulted in "a disproportionate collapse of the entire structure."[33]
NIST anticipates the release of a draft report of 7 WTC by the end of 2007.[33] The investigation of 7 World Trade Center has been delayed for a number of reasons, including that NIST staff who had been working on 7 WTC were assigned full-time from June 2004 to September 2005, to work on the investigation of the collapse of the twin towers.[34] Regarding the investigation of 7 World Trade Center, Dr S. Shyam Sunder stated in a New York magazine interview in March 2006, "We are studying the horizontal movement east to west, internal to the structure, on the fifth to seventh floors?; he then added, "But truthfully, I don?t really know. We?ve had trouble getting a handle on Building No. 7."[35] In June 2007, he explained, "We are proceeding as quickly as possible while rigorously testing and evaluating a wide range of scenarios to reach the most definitive conclusion possible. The WTC 7 investigation is in some respects just as challenging, if not more so, than the study of the towers. However, the current study does benefit greatly from the significant technological advances achieved and lessons learned from our work on the towers."[33]
Despite FEMA's preliminary finding that fire caused the collapse, some conspiracy theorists believe the building seven collapse was the result of a controlled demolition.[36][37] When asked about controlled demolition theories, Dr. Sunder said, "We consulted 80 public-sector experts and 125 private-sector experts. It is a Who?s Who of experts. People look for other solutions. As scientists, we can?t worry about that. Facts are facts."[38] In answer to the question of whether "a controlled[-]demolition hypothesis is being considered to explain the collapse," NIST said: "[w]hile NIST has found no evidence of a blast or controlled demolition event, it would like to determine the magnitude of hypothetical blast scenarios that could have led to the structural failure of one or more critical elements."[34]
