What was tower 7 used for

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Full Terms and Conditions apply to all Subscriptions. Or, if you are already a subscriber Sign in. 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. Today's report confirms that a fire was, indeed, the cause.

The final report describes how debris from the collapse of WTC 1 ignited fires on at least 10 floors of WTC 7 at the western half of the south face. Fires on Floors 7 through 9 and 11 through 13 burned out of control, because the water supply to the automatic sprinkler system had failed. The primary and backup water supply to the sprinkler systems for the lower floors relied on the city's water supply. Those water lines were damaged by the collapse of WTC 1 and 2.

These uncontrolled fires in WTC 7 eventually spread to the northeast part of the building, where the collapse began. The UAF research team utilized three approaches for examining the structural response of WTC 7 to the conditions that may have occurred on September 11, First, we simulated the local structural response to fire loading that may have occurred below Floor 13, where most of the fires in WTC 7 are reported to have occurred.

Second, we supplemented our own simulation by examining the collapse initiation hypothesis developed by the National Institute of Standards and Technology NIST. Third, we simulated a number of scenarios within the overall structural system in order to determine what types of local failures and their locations may have caused the total collapse to occur as observed.