7th tower 9/11

Download Final Report. Public Comments September to November All input data, results data, and simulations that were used or generated during this study can be downloaded as a ZIP file:, 7th tower 9/11. Therefore, downloading the ZIP file and unzipping it will require approximately GB of storage space.

Read more about Modern History. Building 7 was a storey skyscraper that formed part of the World Trade Center complex. Fires broke out on multiple floors of the structure, and at pm on that world-changing day — many hours after the Twin Towers fell — Building 7 collapsed. As its occupants and all rescue workers had already been evacuated by that time, there were no casualties. Read more about Mysteries.

7th tower 9/11

The NIST claimed that embers ignited a fire which then caused the storey building to collapse on itself at p. For expediency and because it was not hit by a plane, the study looked only at WTC 7 not the other two but AET has long claimed all three were subject to something beyond heat induced failure. Further, he says, the debris from WTC 1 which fell feet to WTC 7 did not attain sufficient mass to cause structural damage to the steel in that building. The bottom line, he says, is that the NIST report is flawed and of no value to future engineering or architectural learning. The Alaska report adds new momentum to long standing claims by the AET that all three of the buildings should not have collapsed in the spectacular and deadly manner they did. Further, and Korol underlines this, there was nothing in the offices beyond basic desks, chairs, computers and paper that would be of such a combustible nature so as to feed a fire and raise the temperature to above 1, degrees Celsius and melt the steel structure. UAF civil engineering professor Leroy Hulsey, principal investigator, his research assistants, Feng Xiao, now an associate professor at Nanjing University of Science and Technology and Zhili Quan, now a bridge engineer for the South Carolina Department of Transportation, found that the design standard of the building was not exceeded by the fire and that simultaneous and controlled demolition caused the structural steel to fail. It was also the first NIST finding of a highrise collapse from thermal deformation caused by fire which the page Alaska report disputes. It presents arguments showing it was a simultaneous global failure not a localized failure causing a domino effect. Hulsey et al argue that the collapse was straight down in a pancake fashion with about 2. The study team undertook extensive computer and physical modelling, paying particular attention to the area around Column 79 which had been identified as the critical juncture of failure. Their conclusion is that Columns 79, 80, and 81 did not fail at the lower floors of the building and were not subjected to heat above floor 30 because there were no fires there. Even if they did, they would not trigger a horizontal progression of core column failures and the team was unable to find any other plausible cause for the progressive sequence of failures. This occurred the day after Rumsfeld stated that there was 2.

Full Fact fights for good, reliable information in the media, 7th tower 9/11, and in politics. Public Comments September to November Fires broke out on multiple floors of the structure, and at pm on that world-changing day — many hours after the Twin Towers fell — Building 7 collapsed.

It did not collapse from explosives or from diesel fuel fires. Conspiracy theorists have long pointed to the collapse of the story structure as key evidence that the U. No planes struck the building, and the commonly available views of the exterior didn't show significant damage. Since WTC 7 housed Secret Service and CIA offices, conspiracy theorists claimed that the building was destroyed in a controlled demolition in order to obliterate evidence of the U. It is physically impossible," she said.

During the terror attacks of 11 September , four planes were hijacked: two were flown into the Twin Towers, one into the Pentagon and another crashed in a field in Pennsylvania. Two planes were flown into the North and South towers, part of the World Trade Center complex of seven buildings. Both towers collapsed shortly afterwards. World Trade Center 7 was a storey building in the complex, which was not directly hit by an aircraft, and also collapsed later that day. There are a number of reasons this building collapsed on the day, despite not being hit by planes, which have been described by investigators, scientists and experts since.

7th tower 9/11

Official websites use. Share sensitive information only on official, secure websites. On Sept. Debris from the collapse of WTC 1, which was feet to the south, ignited fires on at least 10 floors in the building at its south and west faces. However, only the fires on some of the lower floors-7 through 9 and 11 through burned out of control. These lower-floor fires-which spread and grew because the water supply to the automatic sprinkler system for these floors had failed-were similar to building fires experienced in other tall buildings. The primary and backup water supply to the sprinkler systems for the lower floors relied on the city's water supply, whose lines were damaged by the collapse of WTC 1 and WTC 2. These uncontrolled lower-floor fires eventually spread to the northeast part of WTC 7, where the building's collapse began.

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Read more about Modern History. Eventually, a girder on Floor 13 lost its connection to a critical column, Column 79, that provided support for the long floor spans on the east side of the building see Diagram 1. Sandra Jay May 20, The debris from WTC 1 caused structural damage to the southwest region of WTC 7—severing seven exterior columns—but this structural damage did not initiate the collapse. The extensive three-year scientific and technical building and fire safety investigation found that the fires on multiple floors in WTC 7, which were uncontrolled but otherwise similar to fires experienced in other tall buildings, caused an extraordinary event. NIST needs to be able to prove that the UAF study which is publicly available is not accurate or at least be able to make their modelling information public so that others can scrutinize their findings. Update Unbound. How can the investigators be so sure they know what happened? Unsurprisingly, the explanations of figures like Clarke, Porter and the experts at NIST have not swayed truthers from their rigidly-held beliefs. Geological Survey November Additionally, in each of the other referenced buildings, the fires burned out several floors, even with available water and firefighting activities except for WTC 5. Column 79, no longer supported by a girder, buckled, triggering a rapid succession of structural failures that moved from east to west. To apply thermite to a large steel column, approximately 0. NIST concluded that blast events inside the building did not occur and found no evidence supporting the existence of a blast event.

Two commercial airliners hijacked by al-Qaeda terrorists were deliberately flown into the Twin Towers of the complex, resulting in a total progressive collapse that killed almost 3, people. It is the deadliest and most costly building collapse in history. The towers' destruction caused major devastation throughout Lower Manhattan , and more than a dozen adjacent and nearby structures were damaged or destroyed by debris from the plane impacts or the collapses.

District Court of the District of Columbia, Apr. Therefore, the sprinkler system could not function. This is for one column; presumably, more than one column would have been prepared with thermite, if this approach were to be used. A missile hit the Pentagon destroying the section where the ONI was investigating the fraud. Retrieved December 9, A full copy of the report is available for free at the University website, where all professionals should see for themselves. And well done to all the architects and engineers who tirelessly helped realise this important scientific body of work. Intentional demolition usually requires applying explosive charges to most, if not all, interior columns, not just one or a limited set of columns in a building. How can NIST ignore basic laws of physics? Bill Cain May 21, In addition to using its in-house expertise, NIST relied upon private sector technical experts; accumulated copious documents, photographs and videos of this disaster; conducted first-person interviews of building occupants and emergency responders; analyzed the evacuation and emergency response operations in and around WTC 7; performed computer simulations of the behavior of WTC 7 on Sept. The investigation team concluded that the column's failure under any circumstance would have initiated the same sequence of events. In contrast, the sprinklers and standpipes on the building's middle levels 21st floor through 39th floor and upper levels 40th floor through 47th floor received water from two large overhead storage tanks on the 46th floor, and used the city's water mains as a backup. The building had only half the number of occupants on a typical day-with approximately 4, occupants-at the times the airplanes struck the towers. Maybe we should actually investigate crimes?