eek.
bushman
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It only took me 3.5 years to find this out...gah
The WTC 7 had the same 2 inch fireproofing system, trusses etc, and was only 47 stories high.
(see section 5.3.3 in this PDF file)
It collapsed at 5:20pm, about seven hours after it had caught fire.
(emboldened by me.)
http://concreteproducts.com/mag/concrete_safety_integrity_key/
The WTC 7 had the same 2 inch fireproofing system, trusses etc, and was only 47 stories high.
(see section 5.3.3 in this PDF file)
It collapsed at 5:20pm, about seven hours after it had caught fire.
The new, 52-story 7 World Trade Center was conceived immediately
after the destruction of the original 47-floor structure by the terrorist
acts of 9/11. The building was not directly hit by the two planes that
took down the larger World Trade Center towers, and there were no
known casualties due to its collapse; yet, the performance of the
original WTC 7 is significant because it appears its destruction was
due primarily to fire, started by some combination of debris falling
from WTC 1 and a fuel-distribution system needed to run the
building's generators. The resulting fire burned for about seven
hours before its collapse at 5:20 the afternoon of Sept. 11.
<!--end paragraph--><!--begin paragraph-->
(emboldened by me.)
Since the 9/11 attacks on the World Trade Center, there has been increased focus in New York City on egress in emergency situations occurring in multi-story buildings as well as on the ability of emergency personnel to access fires and other crises on higher floors.
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A prime example of this new approach to high-rise construction was
seen in late June when New York City Mayor Michael Bloomberg
signed a law upgrading the safety of such buildings. Based
on recommendations of the New York City Mayoral Commission,
the measure bans the use of open-web steel joists for structures
more than 75 ft. tall because fire-proofing used to protect these
floor-framing systems is inadequate. The law effectively eliminates
one of two steel floor systems that compete with concrete.
http://concreteproducts.com/mag/concrete_safety_integrity_key/