hihi, ich kanns ja auch nicht glauben. aber es ist wie es ist. offizielle ursache des einsturzes von wtc7: feuer
da gibts wohl nichts zu diskutieren. ich kanns ja auch nicht glauben, aber die angebliche wahrheit ist halt sehr komisch
:)http://www.nist.gov/public_affairs/factsheet/wtc_qa_082108.html (Archiv-Version vom 17.01.2009)aber ich zitiere auch gern nochmal:
"Why did WTC 7 collapse, while no other known building in history has collapsed due to fires alone?
The collapse of WTC 7 is the first known instance of a tall building brought down primarily by uncontrolled fires. The fires in WTC 7 were similar to those that have occurred in several tall buildings where the automatic sprinklers did not function or were not present. These other buildings, including Philadelphia's One Meridian Plaza, a 38-story skyscraper that burned for 18 hours in 1991, did not collapse due to differences in the design of the structural system.
SO HIER BITTE HIRN EINSCHALTEN:
Factors contributing to WTC 7’s collapse included: the thermal expansion of building elements such as floor beams and girders, which occurred at temperatures hundreds of degrees below those typically considered in current practice for fire-resistance ratings; significant magnification of thermal expansion effects due to the long-span floors in the building; connections between structural elements that were designed to resist the vertical forces of gravity, not the thermally induced horizontal or lateral loads; and an overall structural system not designed to prevent fire-induced progressive collapse."
@Fuchs76lies doch einfach dort nach.