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Why would there be buckling and plums of pressure being forced out of the building... approx.15 stories above the impact?
originally posted by: MALBOSIA
How about someone that supports the official story (maybe NIST?) produce a visual reinactment of what they believe happened.
I mean, if its all so irrefutable, it should be easy to visualize therefore easy to visually display.
Here is quick search. Let me know which one I should watch to help me come to terms with what the OS is pushing.
Let me know. If Im not post-banned by then..
There is no visual reinactment of the WTC collapse and there likely never will.
AN ANALYSIS OF THE TIPPING OF THE UPPER SECTION OF WTC 2 By
F.R. Greening
www.911myths.com...
A recent article entitled: “A Discussion of the Final NIST Report on the Collapse of WTC Buildings 1 and 2”, (available in pdf format on 911Myths.com), considers the tilting of WTC 2 prior to its collapse and notes that a 2 tilt of the upper section is the largest possible pre-collapse angle that is consistent with video and photographic observations of WTC 2. Thus, as the video evidence clearly shows, the NIST Final Report greatly exaggerates the pre-collapse tilt angle of WTC 2.
Break
5.0 Summary and Conclusions
The collapse of WTC 2 began with a tilting or rotational motion of the upper section of the Tower about a “hinge” at the 80th floor. This rotational motion, which commenced at a tilt angle 2, was caused by an almost instantaneous multi-column failure that eliminated the structural support on one side of WTC 2 near the impact zone. Once set in motion, the upper block moved with a nearly “free” rotational trajectory of a body pivoting under the constant force of gravity. This behavior was sustained at tilt angles up to about 25. Thereafter the motion of the block changed somewhat although the suggestion that the tilting suddenly stopped is not correct.
What appears to happen is that the tilting upper section was continuously crushed near the 80th floor by its own momentum so that the rotation was no longer that of a rigid body. Eventually the "hinge" at the northeast corner failed and the descending block took on a more vertical motion. Interestingly, once the hinge failed, and the pivot became frictionless, the motion of the center of gravity is predicted to become vertical, causing a shift in the rotational axis. Unfortunately, however, details of this stage of the WTC 2 collapse were obscured by smoke, dust and flying debris.
WTC2 Initial Tilt with Draft Overlay
m.youtube.com...
WTC2 #1 Rotated
m.youtube.com...
originally posted by: neutronflux
Video of tilt “a split second before collapse started”
WTC2 Initial Tilt with Draft Overlay
m.youtube.com...
WTC2 #1 Rotated
m.youtube.com...
The tower was starting to lean a split second before collapse.
Please cite a source in the context “It proves an outward force a split second before collapse started.” Not what you pictured is a tilt in a 2-d photo.
And still waiting on proof of a single vertical column that buckeled towards the outside of the tower? As opposed to the vertical columns buckled in towards the interior of the tower because that was the direction the vertical columns were pulled.
And still waiting on you to quote a single person that is defending NIST in this thread?
www.911myths.com...
The rotation of the upper section of WTC 2 is clearly visible in the video and photographic record of 9-11 and was discussed by Bazant and Zhou, (B & Z), in one of the first studies of the collapse of WTC 1 & 2: “Why did the World Trade Center Collapse?” published in the September 2001 issue of Journal of Engineering Mechanics.
To remind people that what is being pushed by bullies that supporr the OS is merely a theory and its ok to think for themselves.
The plane as a whole did not fly OUT of the building, you that right?
www.metabunk.org...
When United Flight 175 hit World Trade Center Tower 2 on 9/11 some large parts of it passed through the building and landed in the streets to the north.
Aircraft Impact Damage Tomasz Wierzbicki
Professor of Applied Mechanics, MIT
Liang Xue
Ph.D. Candidate of Ocean Engineering, MIT
Meg Hendry-Brogan
Undergraduate student of Ocean Engineering, MIT
web.mit.edu...
Depending which case considered in Table 2 will be valid, the number of destroyed
core columns in South Tower will vary between minimum of 7 and maximum of 20. It should be noted that the prediction for the North Tower would be different for two reasons. First, the impact velocity is smaller and hence the kinetic energy induced by the airplane is less. Second, the airplane impacted the tower on different side correlating with the core structure orientation, so that the energy dissipated by these longer floors was larger. Taking the each of the factors above into consideration, the predicted number of damaged core columns in the North Tower will vary between 4 and 12. There will be an enormous difference between the ways in which the global collapse was initiated in both towers. Effect of the local damage on the global collapse of each tower is discussed next.
Break
Location of damaged zone: From the trajectory of the aircraft impacting the South Tower described in Figure 4. it is clear that the impacts of aircraft were not symmetric with respect to the centroids of the tower’s cross-section. Both the outside columns and the inner columns were destroyed in asymmetric manners, and thus the locations of the centroid of the cross- section was shifted considerably. (See Figure 22 center) Therefore, an overturning moment, due to the gravity load, was immediately created, leading to non-uniform distribution of the load over the core and peripheral columns.
originally posted by: neutronflux
a reply to: MALBOSIA
Can you cite a source. It looks like you are showing the twist and tilt of the tower as this quoted in the link below.
www.911myths.com...
The rotation of the upper section of WTC 2 is clearly visible in the video and photographic record of 9-11 and was discussed by Bazant and Zhou, (B & Z), in one of the first studies of the collapse of WTC 1 & 2: “Why did the World Trade Center Collapse?” published in the September 2001 issue of Journal of Engineering Mechanics.
Please cite a source what you are pass off is outward bending of the actual vertical columns? No tilt and twist in a 2-d photo.
And provide evidence the actual buckling of the vertical columns was not driven inward as shown in video, but buckeled out away from the towers’ interior?
And there is no evidence of a detonation with a shock wave capable of cutting columns. No ejection before collapse.
originally posted by: myss427
a reply to: neutronflux
I think you should spend 11 minutes watching this video made by experts in there field on what happened to the buildings, but I know you wont.
www.youtube.com...
originally posted by: MALBOSIA
originally posted by: neutronflux
a reply to: MALBOSIA
Can you cite a source. It looks like you are showing the twist and tilt of the tower as this quoted in the link below.
www.911myths.com...
The rotation of the upper section of WTC 2 is clearly visible in the video and photographic record of 9-11 and was discussed by Bazant and Zhou, (B & Z), in one of the first studies of the collapse of WTC 1 & 2: “Why did the World Trade Center Collapse?” published in the September 2001 issue of Journal of Engineering Mechanics.
Please cite a source what you are pass off is outward bending of the actual vertical columns? No tilt and twist in a 2-d photo.
And provide evidence the actual buckling of the vertical columns was not driven inward as shown in video, but buckeled out away from the towers’ interior?
And there is no evidence of a detonation with a shock wave capable of cutting columns. No ejection before collapse.
I dont read anything by Bazant. Hes a flagrant idiot.
AN ANALYSIS OF THE TIPPING OF THE UPPER SECTION OF WTC 2 By
F.R. Greening
www.911myths.com...
spend 11 minutes watching this video made by experts in there field on what happened to the buildings, but I know you wont.
www.youtube.com...
originally posted by: myss427
a reply to: samkent
Please show me where the 2 x 110 stories of building are? See the pic of the two towers lowered to ground level with small amounts of rubble around them, with building 7 still in the background before it fell! Theres not almost 1 million tones of debree lying around or neatly stacked in a basements, the aerial shots show that. Or did they fake the images? Most of the rubble around looks as its from the other 4 buildings that were heavily damaged.
archive.is...
Some conspiracy theorists claim that large amounts of the buildings were unaccounted for by the size of the rubble pile. Since only 12% of the building volume was solid, the towers should collapse into a pile 12% of the original height of the building, or just about 50 meters high. Since 18 meters of that pile would be filling the basement, the above-ground portion would be 32 meters high.
The actual rubble pile reached the fifth story of adjacent buildings, so well outside the footprint of the tower the pile was five stories, or about 15 meters high. The pile would have been roughly conical, and would have included a lot of void space, increasing its height and offsetting the larger diameter of the pile. Overall the rubble pile is what you'd expect.
So it simply isn't true that the rubble pile is only a small percentage of what would be expected. Some conspiracy sites allege that the rubble pile is only 5% of what would be expected. Others use a figure of 33% as the height of a rubble pile relative to the original building and then argue that the pile should have been 140 or so meters high. But when Controlled Demolition Inc. (www.controlled-demolition.com...) dropped a 23-story, 439-foot (134 m) building in Detroit in 1997, they ended up with a pile averaging 35 feet high (11 m) and a maximum of 60 feet (18 m) high. The rubble pile was an average of 8% of the height of the original building and a maximum of 14%. Scaling that up to the World Trade Center, we get heights of 33 to 58 meters. In other words, the rubble pile at the World Trade Center is totally in line with other large building collapses. 33% may work for a small building a few stories high, but a large building will compress the debris pile a lot more and also fill void spaces more effectively with pulverized debris.