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Debris from WTC 2 struck the building with sufficient force to crush approximately 16 stories in the center of the building, as shown in Figure 3-7. In spite of this extensive damage, the collapse did not continue down to the foundations or extend horizontally to the edges of the structure. In fact, the two northernmost bays (approximately 60 feet) remained intact all the way to the roof. A similar, but lesser condition existed in the southern bays. Even in the center of the building, the collapse stopped at approximately the 7th floor. This arrested collapse implies that the structure was sufficiently strong and robust to absorb the energy of the falling debris and collapsed floors, but at the same time the connections between the destroyed and remaining framing were able to break apart without pulling down the rest of the structure. This complex behavior resulted in the survival of large portions of the building following the collapse of WTC 2.
The second loading event was the collapse of WTC 1. Debris from WTC 1 fell along the entire length of the hotel. Lower floors at the southwest end of WTC 3 survived although they suffered extensive damage.
Originally posted by thedman
reply to post by Jeff Riff
Marriot Hotel (WTC 3) did not so much as collapse as was flattened by
the collapse of the Towers on top of it. The only thing left standing
was a steel "cage" which was constructed to support the building
following the 1993 bombing which severely damaged the building
putting it danger of collapsing. Several dozen firemen were killed
when Towers collpased on it.
Originally posted by IvanZana
Look at how close World Trade Center 7 was to it's neighbours. A junior demolition company could not do what those "fires" did to WTC 7.
Quite obvious that WTC 7 was a controlled demolition and an excellent one at that.
Originally posted by Jeff Riff
[My point is, if the damage to the Marriott was that extreme, yet it remained standing, what damage to 7 was there that caused it to fall?
Is this it?
www.debunking911.com...
The building was constructed above a Con Edison substation, which had been on the site since 1967.[3] The substation had a caisson foundation designed to carry the weight of a future building on the site of 25 stories containing 600,000 sq ft (55,700 m²).[4] The final design for 7 World Trade Center was for a much larger building covering a larger footprint than originally planned when the substation was built.[5]
The structural design of 7 World Trade Center included features to allow a larger building than originally planned to be constructed. A system of gravity column transfer trusses and girders was located between floors 5 and 7 to transfer loads to the smaller foundation.[3] Existing caissons installed in 1967 were used, along with new ones, to accommodate the building. The fifth floor functioned as a structural diaphragm, providing lateral stability and distribution of loads between the new and old caissons. Above the seventh floor, the building's structure was a typical tube-frame design, with columns in the core and on the perimeter, and lateral loads resisted by perimeter moment frames.[4]
Originally posted by beachnut
Now all you need is evidence. 6 years and no evidence to support this failed idea of CD on WTC7.
There were hundreds of witnesses that said they heard explosions and said they sounded like demo charges (boom, boom, boom - one after another.)
Originally posted by Swampfox46_1999
...Wild ass theories about demolition crews running into the building that day and wiring it up for demolition doesnt. Neither does a covert action over many months for a crew to secretly wire the building...